/[pub]/test/html-webhacc/error-description-source.xml
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revision 1.2 by wakaba, Mon Jul 16 08:38:48 2007 UTC revision 1.34 by wakaba, Sat Aug 16 07:42:20 2008 UTC
# Line 11  Web Document Conformance Checker (BETA)< Line 11  Web Document Conformance Checker (BETA)<
11  <body>  <body>
12  <h1>Description of Errors</h1>  <h1>Description of Errors</h1>
13    
14    <section id="character-encoding-layer">
15    <h2>Character Encoding Layer Errors</h2>
16    
17    <d:item name="illegal-octets-error" class="error-category-charset" level="m">
18      <d:message xml:lang="en">An illegal octet in the input stream.</d:message>
19    </d:item>
20    </section>
21    
22    <section id="html5-character-encoding">
23    <h2>HTML5 Character Encoding Errors</h2>
24    
25    <d:item name="disallowed character encoding"
26        modules="ContentChecker">
27      <d:message xml:lang="en">Character encoding <code><var>{text}</var></code>
28      is not allowed for <abbr>HTML</abbr> document.</d:message>
29      <d:desc xml:lang="en">
30        <p>The character encoding used for the document is not allowed
31        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
32      </d:desc>
33    </d:item>
34    
35    <d:item name="bad character encoding"
36        modules="ContentChecker">
37      <d:message xml:lang="en">Character encoding <code><var>{text}</var></code>
38      should not be used for <abbr>HTML</abbr> document.</d:message>
39      <d:desc xml:lang="en">
40        <p>The character encoding used for the document is not recommended
41        for <abbr>HTML</abbr> document.  The document is non‐conforming
42        unless there is any good reason to use that encoding.</p>
43      </d:desc>
44    </d:item>
45    
46    <d:item name="non-utf-8 character encoding"
47        modules="ContentChecker">
48      <d:message xml:lang="en">Use of UTF-8 is encouraged (this document
49      is encoded in <code><var>{text}</var></code>).</d:message>
50      <d:desc xml:lang="en">
51        <p>Use of UTF-8 as the character encoding of the document is encouraged,
52        though the use of another character encoding is still conforming.</p>
53      </d:desc>
54    </d:item>
55    
56    <d:item name="character encoding unchecked"
57        modules="ContentChecker">
58      <d:message xml:lang="en">Conformance for character encoding requirements
59      cannot be checked, since the input is not a byte stream.</d:message>
60      <d:desc xml:lang="en">
61        <p>The conformance checker cannot detect whether the input document
62        met the requirements on character encoding, since the document
63        is not inputed as a serialized byte sequence.  The document is
64        not conforming if it is not encoded in an appropriate character
65        encoding with appropriate labeling.</p>
66      </d:desc>
67    </d:item>
68    
69    <d:item name="no character encoding declaration"
70        modules="ContentChecker">
71      <d:message xml:lang="en">There is no character encoding
72      declaration.</d:message>
73      <d:desc xml:lang="en">
74        <p>The document does not contain a character encoding
75        declaration.  Unless the character encoding is explicitly
76        specified in lower‐level protocol, e.g. in <abbr>HTTP</abbr>,
77        or is implied by <abbr>BOM</abbr>, there must be a character
78        encoding declaration.  The document is non‐conforming.</p>
79    
80        <p>The long character encoding declaration syntax
81        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
82        is obsolete.  The new syntax is:</p>
83        <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
84    
85        <p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr>
86        declaration has no effect for <abbr>HTML</abbr> document.</p>
87      </d:desc>
88    </d:item>
89    
90    <d:item name="non ascii superset"
91        modules="ContentChecker">
92      <d:message xml:lang="en">No character encoding metadata is found
93      in lower‐level protocol nor is there <abbr>BOM</abbr>, while
94      character encoding <code><var>{text}</var></code>
95      is not a superset of <abbr>ASCII</abbr>.</d:message>
96      <d:desc xml:lang="en">
97        <p>The document is not labeled with character encoding name
98        in lower‐level protocol, e.g. in <abbr>HTTP</abbr>, and
99        the document is not begin with <abbr>BOM</abbr>.  In addition,
100        the character encoding of the document is not a superset of
101        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
102    
103        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
104        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
105        as:</p>
106        <pre class="http example"><code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
107    
108        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
109        <code class="html example">&lt;meta charset="<var>charset-name</var>"></code>,
110        does not allow to omit <code>charset</code> parameter
111        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
112        compatible encoding.</p>
113    
114        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
115        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
116        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
117      </d:desc>
118    </d:item>
119    
120    <d:item name="sniffing:chardet"
121        modules="HTML::Parser">
122      <d:message xml:lang="en">Character encoding of this document is sniffed
123      as <code><var>{text}</var></code> (Sniffed because no explicit specification
124      for the character encoding of this document is found in the transfer
125      procotol headers).</d:message>
126    </d:item>
127    
128    <d:item name="sniffing:default"
129        modules="HTML::Parser">
130      <d:message xml:lang="en">Character encoding of this document is defaulted
131      to <code><var>{text}</var></code> because no explicit specification
132      for the character encoding of this document is found in the transfer
133      procotol headers.</d:message>
134    </d:item>
135    
136    <d:item name="chardecode:fallback"
137        modules="HTML::Parser">
138      <d:message xml:lang="en">Since no decoder for the document character
139      encoding is found, decoder for the character encoding
140      <code><var>{text}</var></code> is used.  Checking results might be
141      <em>wrong</em>.</d:message>
142    </d:item>
143    
144    <d:item name="chardecode:no error"
145        modules="HTML::Parser">
146      <d:message xml:lang="en">Conformance error checking for the character
147      encoding <code><var>{text}</var></code> is not supported.</d:message>
148    </d:item>
149    
150    <d:item name="charset label:matching"
151        modules="HTML::Parser">
152      <d:message xml:lang="en">Sniffed character encoding
153      <code><var>{text}</var></code> is same as the character encoding specified
154      in the character encoding declaration.  This is <em>not</em> an
155      error.</d:message>
156    </d:item>
157    
158    <d:item name="charset label detected"
159        class="format-charset warning"
160        modules="HTML::Parser">
161      <d:message xml:lang="en">While parsing the document as
162      <code><var>{text}</var></code>, a character encoding declaration specifying
163      a different character encoding is found.  The document
164      is reparsed.</d:message>
165      <d:desc xml:lang="en">
166        <p>While parsing a document in a character encoding,
167        a character encoding declaration which declares the character
168        encoding of the document as another character encoding is found.
169        The occurence of this warning itself does not make the document
170        non‐conforming.  However, the failure of the first attempt to
171        to detect the character encoding might be a result of non‐conformance
172        of the document.</p>
173    
174        <p>The document will be reparsed from the beginning.  Some error
175        or warning might be reported again.</p>
176    
177        <p>These are suggestions to avoid this warning:</p>
178        <ul>
179        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
180        field in the <abbr>HTTP</abbr> header, as:
181        <pre class="HTTP example"><code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
182        <li>Put the character encoding declaration
183        (<code class="html example">&lt;meta charset="<var>charset-name</var>"></code>)
184        just after <code class="html example">&lt;head></code> start tag.</li>
185        <li>Use <code>UTF-8</code>.</li>
186        </ul>
187      </d:desc>
188    </d:item>
189    
190    <d:item name="NULL"
191        modules="HTML::Parser">
192      <d:message xml:lang="en">The <code class="charname">NULL</code> character
193      is not allowed.</d:message>
194    </d:item>
195    
196    <d:item name="control char"
197        modules="HTML::Parser">
198      <d:message xml:lang="en">Code point <code><var>{text}</var></code> is
199      not allowed.</d:message>
200    </d:item>
201    
202    </section>
203    
204  <section id="html5-tokenize-error">  <section id="html5-tokenize-error">
205  <h2>HTML5 Parse Errors in Tokenization Stage</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
206    
207    <d:item name="after html"
208        class="parse-error">
209      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
210      is not allowed after the end tag <code>&lt;/html></code>.</d:message>
211      <d:desc xml:lang="en">
212        <p>The start or end tag of an element appears after the
213        <code>html</code> element has been closed.  The document is
214        non-conforming.</p>
215    
216        <p>Any content of the document other than comments
217        must be put into the <code>html</code> element.</p>
218      </d:desc>
219    </d:item>
220    
221    <d:item name="after body"
222        class="parse-error">
223      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
224      is not allowed after the end tag <code>&lt;/body></code>.</d:message>
225      <d:desc xml:lang="en">
226        <p>The start or end tag of an element appears after the
227        <code>body</code> element has been closed.  The document is
228        non-conforming.</p>
229    
230        <p>Any content of the document other than <code>head</code>
231        contents and comments must be put into the <code>body</code>
232        element.</p>
233      </d:desc>
234    </d:item>
235    
236    <d:item name="bad attribute name"
237        class="tokenize-error"
238        modules="HTML::Parser">
239      <d:message xml:lang="en">Attribute name cannot contain characters
240      <code>"</code>, <code>'</code>, and <code>=</code>.</d:message>
241    </d:item>
242    
243    <d:item name="bad attribute value"
244        class="tokenize-error"
245        modules="HTML::Parser">
246      <d:message xml:lang="en">Attribute value must be quoted by <code>"</code>
247      or <code>'</code> if it contains a <code>"</code>, <code>'</code>, or
248      <code>=</code> character.</d:message>
249    </d:item>
250    
251    <d:item name="bare ero"
252        class="tokenize-error"
253        modules="HTML::Parser">
254      <d:message xml:lang="en">The <code>&amp;</code> character must
255      be escaped as <code class="html example">&amp;amp;</code>.</d:message>
256      <d:desc xml:lang="en">
257        <p>An <code>&amp;</code> character which
258        is not part of any reference appears in the input stream.
259        The document is non‐conforming.</p>
260    
261        <p><em>Any <code>&amp;</code> character in URI (or IRI)
262        must be escaped as <code class="example">&amp;amp;</code>.</em></p>
263    
264        <p>The <code>&amp;</code> character must
265        be the first character of a reference:
266          <dl class="switch">
267          <dt>Named entity reference</dt>
268              <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
269              where <var>entity-name</var> is the name of the
270              character entity to be referenced.</dd>
271          <dt>Numeric character reference</dt>
272              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
273              where <var>d</var> is the decimal representation of
274              the code position of the character to be referenced.</dd>
275          <dt>Hexadecimal character reference</dt>
276              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
277              where <var>h</var> is the hexadecimal representation
278              of the code position of the character to be referenced.</dd>
279          </dl>
280        </p>
281    
282        <p>To represent <code>&amp;</code> as a data character, use
283        named entity reference:
284          <pre class="html example"><code>&amp;amp;</code></pre>
285        </p>
286      </d:desc>
287    </d:item>
288    
289    <d:item name="bare etago"
290        class="tokenize-error"
291        modules="HTML::Parser">
292      <d:message xml:lang="en">A <code>&lt;/</code> string is not followed
293      by a tag name.</d:message><!-- </ EOF -->
294      <d:desc xml:lang="en">
295        <p>There is a <code>&lt;</code> (<code>U+003C</code>
296        <code class="charname">LESS-THAN SIGN</code>) character
297        immediately followed by a <code>/</code> (<code>U+005F</code>
298        <code>SOLIDUS</code>) character, which is not part
299        of any end tag, in the input stream.  The document
300        is non-conforming.</p>
301    
302        <p>The <code>&lt;/</code> sequence immediately followed
303        by an <abbr title="End of file pseudo-character">EOF</abbr> is
304        interpreted as a string data of <code>&lt;/</code>.</p>
305    
306        <p>The <code>&lt;/</code> sequence as string data must
307        be escaped as:
308        <pre class="html example"><code>&amp;lt;/</code></pre>
309        </p>
310      </d:desc>
311    </d:item>
312    
313    <d:item name="bare stago"
314        class="tokenize-error"
315        modules="HTML::Parser">
316      <d:message xml:lang="en">A <code>&lt;</code> character is not followed
317      by tag name or by a <code>!</code> character.</d:message>
318      <d:desc xml:lang="en">
319        <p>A <code>&lt;</code> (<code>U+003C</code>
320        <code class="charname">LESS-THAN SIGN</code>) character which is not part
321        of any markup appears in the input stream.</p>
322    
323        <p>The <code>&lt;</code> character as a data character must
324        be escaped as:
325        <pre class="html example"><code>&amp;lt;</code></pre>
326        </p>
327      </d:desc>
328    </d:item>
329    
330    <d:item name="bare nero"
331        class="tokenize-error"
332        modules="HTML::Parser">
333      <d:message xml:lang="en">The decimal representation of the code position
334      of a character must be specified after <code>&amp;#</code>.</d:message>
335      <d:desc xml:lang="en">
336        <p>An <code>&amp;</code> (<code>U+0026</code>
337        <code class="charname">AMPERSAND</code>) character immediately
338        followed by a <code>#</code> (<code>U+0023</code>
339        <code>NUMBER SIGN</code>) character which
340        is not part of any reference appears in the input stream.
341        The document is non-conforming.</p>
342    
343        <p>The string <code>&amp;#</code> must be the first two characters
344        of a reference:
345          <dl class="switch">
346          <dt>Numeric character reference</dt>
347              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
348              where <var>d</var> is the decimal representation of
349              the code point of the character to be referenced.</dd>
350          <dt>Hexadecimal character reference</dt>
351              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
352              where <var>h</var> is the hexadecimal representation
353              of the code point of the character to be referenced.</dd>
354          </dl>
355        </p>
356    
357        <p>To represent <code>&amp;#</code> as data characters, use
358        a named entity reference for the <code>&amp;</code> character:
359          <pre class="html example"><code>&amp;amp;#</code></pre>
360        </p>
361      </d:desc>
362    </d:item>
363    
364    <d:item name="bare hcro"
365        class="tokenize-error"
366        modules="HTML::Parser">
367      <d:message xml:lang="en">The hexadecimal representation of the code position
368      of a character must be specified after <code>&amp;#x</code>.</d:message>
369      <d:desc xml:lang="en">
370       <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> which
371       is not part of any reference appears in the input stream.
372        The document is non-conforming.</p>
373    
374        <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> must
375        be the first three characters of a hexadecimal reference:
376          <pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
377        where <var>h</var> is the hexadecimal representation
378        of the code point of the character to be referenced.</p>
379    
380        <p>To represent <code>&amp;#x</code> as data characters, use
381        a named entity reference for the <code>&amp;</code> character:
382          <pre class="html example"><code>&amp;amp;#x</code></pre>
383        </p>
384      </d:desc>
385    </d:item>
386    
387    <d:item name="bogus comment"
388        class="tokenize-error"
389        modules="HTML::Parser">
390      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
391      by <code>--</code>.</d:message>
392      <d:desc xml:lang="en">
393        <p>There is a <code>&lt;</code> (<code>U+003C</code>
394        <code class="charname">LESS-THAN SIGN</code>) character
395        followed by a <code>!</code> (<code>U+0021</code>
396        <code class="charname">EXCLAMATION MARK</code>) character,
397        which is not followed by a <code>--</code> or
398        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
399    
400        <dl class="switch">
401        <dt>Comments</dt>
402          <dd>In HTML document, comments must be introduced by
403          <code class="example">&lt;!--</code> (<code>&lt;!</code>
404          <em>immediately</em> followed
405          by <em>two</em> <code>-</code>s) and must be terminated by
406          <code class="example">--></code>.
407          Strings <code>&lt;!</code> not followed
408          by <code>--</code> and <code>&lt;!-</code> not followed by
409          <code>-</code> are not valid open delimiters for comments.</dd>
410        <dt>Marked sections, including <code>CDATA</code> sections</dt>
411          <dd>Marked sections are not allowed in HTML document.</dd>
412        <dt>Markup declarations</dt>
413          <dd>Markup declarations, except for <code>DOCTYPE</code>
414          and comment declarations, are not allowed in HTML document.</dd>
415        <dt>String <code>&lt;!</code></dt>
416          <dd>String <code>&lt;!</code> must be escaped as
417          <code class="example">&amp;lt;!</code>.</dd>
418        </dl>
419      </d:desc>
420    </d:item>
421    
422    <d:item name="bogus end tag"
423        class="tokenize-error"
424        modules="HTML::Parser">
425      <d:message xml:lang="en">String <code>&lt;/</code> is not followed
426      by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
427      <d:desc xml:lang="en">
428        <p>There is a <code>&lt;</code> (<code>U+003C</code>
429        <code class="charname">LESS-THAN SIGN</code>) character
430        immediately followed by a <code>/</code> (<code>U+005F</code>
431        <code>SOLIDUS</code>) character, which is not part
432        of any end tag, in the input stream.  The document
433        is non-conforming.</p>
434    
435        <p>The <code>&lt;/</code> sequence not followed by a
436        tag name is parsed as an opening of bogus comment.</p>
437    
438        <p>The <code>&lt;/</code> sequence as string data must
439        be escaped as:
440        <pre class="html example"><code>&amp;lt;/</code></pre>
441        </p>
442      </d:desc>
443    </d:item>
444    
445    <d:item name="C1 character reference"
446        class="tokenize-error"
447        modules="HTML::Parser">
448      <d:message xml:lang="en">Character reference to
449      <code><var>{text}</var></code> is not allowed.</d:message>
450    </d:item>
451    
452    <d:item name="CR character reference"
453        class="tokenize-error"
454        modules="HTML::Parser">
455      <d:message xml:lang="en">Character reference to
456      <code>U+000D</code> (<code class="charname">CARRIAGE RETURN</code>)
457      is not allowed.</d:message>
458    </d:item>
459    
460    <d:item name="dash in comment"
461        class="tokenize-error"
462        modules="HTML::Parser">
463      <d:message xml:lang="en">There is a <code>--</code> sequence
464      in a comment.</d:message>
465      <d:desc xml:lang="en">
466        <p>There is a <code>-</code> (<code>U+002D</code>
467        <code class="charname">HYPHEN-MINUS</code>) character
468        at the end of the comment or a <code>--</code> sequence
469        in the comment.  The document is non-conforming.</p>
470    
471        <p>Comments cannot contain a string <code>--</code>, as in XML.
472        Unlike SGML, there cannot be more than one comments
473        (where <i>comment</i> is an SGML term) in the comment
474        declaration.</p>
475      </d:desc>
476    </d:item>
477    
478  <d:item name="duplicate attribute"  <d:item name="duplicate attribute"
479      class="tokenize-error">      class="tokenize-error"
480    <d:message xml:lang="en">There are two attributes with same name.</d:message>      modules="HTML::Parser">
481      <d:message xml:lang="en">There are two attributes with name
482          <code><var>{text}</var></code>.</d:message>
483    <d:desc xml:lang="en">    <d:desc xml:lang="en">
484      <p>Attributes must be unique in an element.  Specifying      <p>There are more than one attributes with the same
485      attributes with same name more than once is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
486    
487      <p>The <code>motion</code> attribute is not part of the HTML standard.      <p>The <code>motion</code> attribute is not part of the HTML standard.
488      Use <code>img</code> element with animation GIF instead.</p>      Use <code>img</code> element with animation GIF instead.</p>
489    </d:desc>    </d:desc>
490  </d:item>  </d:item>
491    
492    <d:item name="empty start tag"
493        class="tokenize-error"
494        modules="HTML::Parser">
495      <d:message xml:lang="en">Empty start tag (<code>&lt;></code>) is not
496      allowed.</d:message>
497    </d:item>
498    
499    <d:item name="empty end tag"
500        class="tokenize-error"
501        modules="HTML::Parser">
502      <d:message xml:lang="en">Empty end tag (<code>&lt;/></code>) is not
503      allowed.</d:message>
504    </d:item>
505    
506    <d:item name="end tag attribute"
507        class="tokenize-error"
508        modules="HTML::Parser">
509      <d:message xml:lang="en">End tag cannot have attributes.</d:message>
510    </d:item>
511    
512    <d:item name="invalid character reference"
513        class="tokenize-error"
514        modules="HTML::Parser">
515      <d:message xml:lang="en">Character reference to
516      <code><var>{text}</var></code> is not allowed.</d:message>
517    </d:item>
518    
519  <d:item name="nestc"  <d:item name="nestc"
520      class="tokenize-error">      class="tokenize-error"
521    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be      modules="HTML::Parser">
522      <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
523    used for this element.</d:message>    used for this element.</d:message>
524    <d:desc xml:lang="en">    <d:desc xml:lang="en">
525      <p>The void element syntax <code>/></code> syntax can only be      <p>Polytheistic slash (<code>/></code>) must not be used
526        for the element.  The document is non-conforming.</p>
527    
528        <p>The polytheistic slash can only be
529      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
530      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
531      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
532      <code>col</code>, and <code>input</code> elements.      <code>col</code>, and <code>input</code> elements.</p>
     For any other elements, using that syntax is non-conforming.</p>  
533    
534      <p>Unlike XML, the void element syntax (<code>/></code>) has      <dl class="switch">
535        <dt><code>&lt;script/></code></dt>
536            <dd><p>The polytheistic slash cannot be used for <code>script</code>
537            element.  Even for an empty <code>script</code> element,
538            there must be an explicit end tag
539            <code class="html example">&lt;/script></code>.</p>
540    
541            <p><strong>NOTE</strong>: Though some user agents interpret
542            polytheistic slash for <code>script</code> element as the
543            closing of the element, such usage is not allowed under
544            the current standard.</p></dd>
545        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
546        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
547        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
548            <dd>These elements are themselves non-conforming.</dd>
549        <!-- isindex, image -->
550        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
551        <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
552            <dd>Future revision of HTML5 parsing algorithm is expected
553            to allow polytheistic slash for these elements.</dd>
554        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
555            <dd>These elements are not always empty and therefore
556            polytheistic slash is not allowed.  Use explicit end tag
557            to represent empty element as:
558              <pre class="example html"><code>&lt;p>&lt;/p></code></pre>
559            </dd>
560        </dl>
561    
562        <p>Note that, unlike in XML, the polytheistic slash has
563      no effect in HTML.</p>      no effect in HTML.</p>
564    </d:desc>    </d:desc>
565  </d:item>  </d:item>
566    
567    <d:item name="no DOCTYPE name"
568        class="tokenize-error"
569        modules="HTML::Parser">
570      <d:message xml:lang="en">After the string <code>&lt;!DOCTYPE </code>, the
571      document type name must be specified.</d:message>
572    </d:item>
573    
574    <d:item name="no PUBLIC literal"
575        class="tokenize-error"
576        modules="HTML::Parser">
577      <d:message xml:lang="en">After the keyword <code>PUBLIC</code>, no
578      oublic identifier is specified.</d:message>
579    </d:item>
580    
581    <d:item name="no refc"
582        class="tokenize-error"
583        modules="HTML::Parser">
584      <d:message xml:lang="en">Character reference must be closed by a
585      <code>;</code> character.</d:message>
586    </d:item>
587    
588    <d:item name="no space before DOCTYPE name"
589        class="tokenize-error"
590        modules="HTML::Parser">
591      <d:message xml:lang="en">After the string <code>&lt;!DOCTYPE</code>, there
592      must be at least a white space character before the document type
593      name.</d:message>
594    </d:item>
595    
596    <d:item name="no space between attributes"
597        class="tokenize-error"
598        modules="HTML::Parser">
599      <d:message xml:lang="en">Attributes must be separeted by at least a
600      white space character.</d:message>
601    </d:item>
602    
603    <d:item name="no SYSTEM literal"
604        class="tokenize-error"
605        modules="HTML::Parser">
606      <d:message xml:lang="en">After the keyword <code>SYSTEM</code>, no
607      system identifier is specified.</d:message>
608    </d:item>
609    
610    <d:item name="pio"
611        class="tokenize-error"
612        modules="HTML::Parser">
613      <d:message xml:lang="en">Processing instruction
614      (<code>&lt;?<var>...</var>></code>) is not allowed in HTML
615      document.</d:message>
616      <d:desc xml:lang="en">
617        <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
618        including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
619        and XML style sheet <abbr title="processing instruction">PI</abbr>
620        (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
621        in the HTML syntax.  The document is non-conforming.</p>
622    
623        <dl class="switch">
624        <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
625          <dd>An <abbr>XBL</abbr> binding cannot be associated by
626          <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
627          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
628          style sheet as:
629            <pre class="html example"><code>&lt;style>
630    p {
631      binding: url(binding.xbl);
632    }
633    &lt;/style></code></pre>
634          </dd>
635        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
636            <dd>XML declaration is unnecessary for HTML documents.</dd>
637        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
638        <abbr title="processing instruction">PI</abbr>)</dt>
639            <dd>Use HTML <code>link</code> element with <code>rel</code>
640            attribute set to <code>stylesheet</code> (or,
641            <code>alternate stylesheet</code> for an alternate style
642            sheet).
643              <pre class="example html"><code>&lt;link rel=stylesheet href="path/to/stylesheet.css"></code></pre>
644            </dd>
645        <dt><code>&lt;?php?&gt;</code> or
646        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
647        (<abbr>PHP</abbr> code)</dt>
648            <dd>The conformance checker does <em>not</em> support
649            checking for PHP source documents.</dd>
650        <dt>Other processing instructions</dt>
651            <dd>Processing instructions cannot be inserted in an HTML
652            document.  Use XML document or insert
653            <code>ProcessingInstruction</code> node by scripting.</dd>
654        </dl>
655    
656        <p>Web browsers will parse processing instructions as bogus
657        comments.  Some legacy Web browsers, such as IE:mac and
658        some mobile Web browsers, will display processing instructions
659        as string.</p>
660      </d:desc>
661    </d:item>
662    
663    <d:item name="string after DOCTYPE name"
664        class="tokenize-error"
665        modules="HTML::Parser">
666      <d:message xml:lang="en">There is a bogus string after the document type
667      name.</d:message>
668    </d:item>
669    
670    <d:item name="string after PUBLIC"
671        class="tokenize-error"
672        modules="HTML::Parser">
673      <d:message xml:lang="en">There is a bogus string after the keyword
674      <code>PUBLIC</code>.</d:message>
675    </d:item>
676    
677    <d:item name="string after PUBLIC literal"
678        class="tokenize-error"
679        modules="HTML::Parser">
680      <d:message xml:lang="en">There is a bogus string after the public
681      identifier.</d:message>
682    </d:item>
683    
684    <d:item name="string after SYSTEM"
685        class="tokenize-error"
686        modules="HTML::Parser">
687      <d:message xml:lang="en">There is a bogus string after the keyword
688      <code>SYSTEM</code>.</d:message>
689    </d:item>
690    
691    <d:item name="string after SYSTEM literal"
692        class="tokenize-error"
693        modules="HTML::Parser">
694      <d:message xml:lang="en">There is a bogus string after the system
695      identifier.</d:message>
696    </d:item>
697    
698    <d:item name="unclosed attribute value"
699        class="tokenize-error"
700        modules="HTML::Parser">
701      <d:message xml:lang="en">Attribute value is not closed by a quotation
702      mark.</d:message>
703    </d:item>
704    
705    <d:item name="unclosed comment"
706        class="tokenize-error"
707        modules="HTML::Parser">
708      <d:message xml:lang="en">Comment is not closed by a string
709      <code>--></code>.</d:message>
710    </d:item>
711    
712    <d:item name="unclosed DOCTYPE"
713        class="tokenize-error"
714        modules="HTML::Parser">
715      <d:message xml:lang="en">The <code>DOCTYPE</code> is not closed by a
716      <code>></code> character.</d:message>
717    </d:item>
718    
719    <d:item name="unclosed PUBLIC literal"
720        class="tokenize-error"
721        modules="HTML::Parser">
722      <d:message xml:lang="en">The public identifier literal is not closed by a
723      quotation mark.</d:message>
724    </d:item>
725    
726    <d:item name="unclosed SYSTEM literal"
727        class="tokenize-error"
728        modules="HTML::Parser">
729      <d:message xml:lang="en">The system identifier literal is not closed by a
730      quotation mark.</d:message>
731    </d:item>
732    
733    <d:item name="unclosed tag"
734        class="tokenize-error"
735        modules="HTML::Parser">
736      <d:message xml:lang="en">Tag is not closed by a <code>></code>
737      character.</d:message>
738    </d:item>
739    
740  </section>  </section>
741    
742  <section id="html5-parse-errors">  <section id="html5-parse-errors">
743  <h2>HTML5 Parse Errors in Tree Construction Stage</h2>  <h2>HTML5 Parse Errors in Tree Construction Stage</h2>
744    
745    <d:item name="after body"
746        class="parse-error"
747        modules="HTML::Parser">
748      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
749      not allowed after the <code>body</code> is closed.</d:message>
750    </d:item>
751    
752    <d:item name="after body:/"
753        class="parse-error"
754        modules="HTML::Parser">
755      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
756      not allowed after the <code>body</code> is closed.</d:message>
757    </d:item>
758    
759    <d:item name="after body:#text"
760        class="parse-error"
761        modules="HTML::Parser">
762      <d:message xml:lang="en">Non‐white‐space characters are not allowed
763      after the <code>body</code> is closed.</d:message>
764    </d:item>
765    
766    <d:item name="after frameset"
767        class="parse-error"
768        modules="HTML::Parser">
769      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
770      not allowed after the <code>frameset</code> is closed.</d:message>
771    </d:item>
772    
773    <d:item name="after frameset:/"
774        class="parse-error"
775        modules="HTML::Parser">
776      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
777      not allowed after the <code>frameset</code> is closed.</d:message>
778    </d:item>
779    
780    <d:item name="after frameset:#text"
781        class="parse-error"
782        modules="HTML::Parser">
783      <d:message xml:lang="en">Non‐white‐space characters are not allowed
784      after the <code>frame</code> is closed.</d:message>
785    </d:item>
786    
787  <d:item name="after head"  <d:item name="after head"
788      class="parse-error">      class="parse-error">
789    <d:message xml:lang="en">The <code><var>$0</var></code> element cannot be    <d:message xml:lang="en">The <code><var>{text}</var></code> element cannot be
790    inserted between <code>head</code> and <code>body</code> elements.</d:message>    inserted between <code>head</code> and <code>body</code>
791      elements.</d:message>
792    <d:desc xml:lang="en">    <d:desc xml:lang="en">
793      <p>A start tag occurs after the <code>head</code> element is closed      <p>A start tag appears after the <code>head</code> element is closed
794      but before the <code>body</code> element is opened.      but before the <code>body</code> element is opened.
795      The document is non-conforming.</p>      The document is non-conforming.</p>
796    </d:desc>    </d:desc>
797  </d:item>  </d:item>
798    
799    <d:item name="after html"
800        class="parse-error"
801        modules="HTML::Parser">
802      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
803      not allowed after the <code>html</code> is closed.</d:message>
804    </d:item>
805    
806    <d:item name="after html:/"
807        class="parse-error"
808        modules="HTML::Parser">
809      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
810      not allowed after the <code>html</code> is closed.</d:message>
811    </d:item>
812    
813    <d:item name="after html:#text"
814        class="parse-error"
815        modules="HTML::Parser">
816      <d:message xml:lang="en">Non‐white‐space characters are not allowed
817      after the <code>html</code> is closed.</d:message>
818    </d:item>
819    
820    <d:item name="image"
821        class="parse-error"
822        modules="HTML::Parser">
823      <d:message xml:lang="en">The <code>image</code> element is
824      obsolete.</d:message>
825    </d:item>
826    
827    <d:item name="in a:a"
828        class="parse-error"
829        modules="HTML::Parser">
830      <d:message xml:lang="en">Anchor cannot be nested.</d:message>
831      <d:desc xml:lang="en">
832        <p>HTML <code>a</code> elements cannot be nested.
833        The document is non-conforming.</p>
834    
835        <p>In the HTML syntax, a start tag of the <code>a</code>
836        implies the end tag of any opening <code>a</code> element.</p>
837      </d:desc>
838    </d:item>
839    
840    <d:item name="in body"
841        class="parse-error"
842        modules="HTML::Parser">
843      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
844      is not allowed in the <code>body</code> element.</d:message>
845      <d:desc xml:lang="en">
846        <p>The start or end tag of an element, which
847        cannot be a descendant of <code>body</code> element, appears
848        in the input stream while the <code>body</code> element has been opened.
849        The document is non-conforming.</p>
850      </d:desc>
851    </d:item>
852    
853    <d:item name="in body:#eof"
854        class="parse-error"
855        modules="HTML::Parser">
856      <d:message xml:lang="en">Some element is not closed before the end of
857      file.</d:message>
858    </d:item>
859    
860    <d:item name="in button:button"
861        class="parse-error"
862        modules="HTML::Parser">
863      <d:message xml:lang="en">The <code>button</code> element cannot be
864      nested.</d:message>
865    </d:item>
866    
867    <d:item name="in CDATA:#eof"
868        class="parse-error"
869        modules="HTML::Parser">
870      <d:message xml:lang="en">Element is not closed before the end of
871      file.</d:message>
872    </d:item>
873    
874    <d:item name="in form:form"
875        class="parse-error"
876        modules="HTML::Parser">
877      <d:message xml:lang="en">Start tag <code>&lt;form></code> is
878      not allowed in a <code>form</code> element.</d:message>
879    </d:item>
880    
881    <d:item name="in frameset"
882        class="parse-error"
883        modules="HTML::Parser">
884      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
885      not allowed in a <code>framset</code> element.</d:message>
886    </d:item>
887    
888    <d:item name="in frameset:/"
889        class="parse-error"
890        modules="HTML::Parser">
891      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
892      not allowed in a <code>frameset</code> element.</d:message>
893    </d:item>
894    
895    <d:item name="in frameset:#text"
896        class="parse-error"
897        modules="HTML::Parser">
898      <d:message xml:lang="en">Non‐white‐space characters are not allowed
899      in a <code>frameset</code> element.</d:message>
900    </d:item>
901    
902    <d:item name="in head:head"
903        class="parse-error"
904        modules="HTML::Parser">
905      <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
906      is not allowed in the <code>head</code> element.</d:message>
907      <d:desc xml:lang="en">
908        <p>There is a start tag <code>&lt;head></code> in the
909        <code>&lt;head></code> element.  The document is non-conforming.</p>
910    
911        <p>In an HTML document there must not be more than
912        one <code>head</code> element, therefore no more than one
913        start tag <code>&lt;head></code> can appear in the input stream.</p>
914      </d:desc>
915    </d:item>
916    
917    <d:item name="in html:#DOCTYPE"
918        class="parse-error"
919        modules="HTML::Parser">
920      <d:message xml:lang="en">A <code>DOCTYPE</code> appears after any
921      element or data character has been seen.</d:message>
922      <!-- <!DOCTYPE HTML><!DOCTYPE HTML> -->
923      <!-- <html><!DOCTYPE HTML> -->
924      <d:desc xml:lang="en">
925        <p>A <code>DOCTYPE</code> appears after any element or data character
926        has been seen.  The document is non-conforming.</p>
927        
928        <p>The <code>DOCTYPE</code> must be placed before any
929        tag, reference, or data character.  Only white space characters
930        and comments can be inserted before the <code>DOCTYPE</code>.</p>
931      </d:desc>
932    </d:item>
933    
934    <d:item name="in nobr:nobr"
935        class="parse-error"
936        modules="HTML::Parser">
937      <d:message xml:lang="en">The <code>nobr</code> element cannot be
938      nested.</d:message>
939    </d:item>
940    
941    <d:item name="in noscript"
942        class="parse-error"
943        modules="HTML::Parser">
944      <d:message xml:lang="en">The <code><var>{text}</var></code> element is not
945      allowed in a <code>noscript</code> element in the
946      <code>head</code> element.</d:message>
947    </d:item>
948    
949    <d:item name="in noscript:/"
950        class="parse-error"
951        modules="HTML::Parser">
952      <d:message xml:lang="en">An end tag <code>&lt;/<var>{text}</var>></code>
953      appers before the <code>noscript</code> element is closed.</d:message>
954    </d:item>
955    
956    <d:item name="in noscript:#eof"
957        class="parse-error"
958        modules="HTML::Parser">
959      <d:message xml:lang="en">A <code>noscript</code> element is not closed
960      before the end of file.</d:message>
961    </d:item>
962    
963    <d:item name="in noscript:#text"
964        class="parse-error"
965        modules="HTML::Parser">
966      <d:message xml:lang="en">Non‐white‐space characters are not allowed
967      in a <code>noscript</code> element in the <code>head</code>
968      element.</d:message>
969    </d:item>
970    
971    <d:item name="in PCDATA:#eof"
972        class="parse-error"
973        modules="HTML::Parser">
974      <d:message xml:lang="en">Element is not closed before the end of
975      file.</d:message>
976    </d:item>
977    
978    <d:item name="in select"
979        class="parse-error"
980        modules="HTML::Parser">
981      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
982      is not allowed in a <code>select</code> element.</d:message>
983    </d:item>
984    
985    <d:item name="in select:/"
986        class="parse-error"
987        modules="HTML::Parser">
988      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>&gt;</code>
989      is not allowed in a <code>select</code> element.</d:message>
990    </d:item>
991    
992    <d:item name="in table"
993        class="parse-error"
994        modules="HTML::Parser">
995      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
996      is not allowed in a <code>table</code> element.</d:message>
997      <d:desc xml:lang="en">
998        <p>The start or end tag of an element, which
999        cannot be a child of <code>table</code> element, appears
1000        in the input stream while the <code>table</code> element has been opened
1001        but no other element has been opened.  The document is non-conforming.</p>
1002    
1003        <p>In <code>table</code>, only table related elements
1004        are allowed; any other element must be contained in
1005        <code>td</code> or <code>th</code> element to form
1006        a part of the table, or <code>caption</code> element to create
1007        a table caption.</p>
1008      </d:desc>
1009    </d:item>
1010    
1011    <d:item name="in table:/"
1012        class="parse-error"
1013        modules="HTML::Parser">
1014      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>&gt;</code>
1015      is not allowed in a <code>table</code> element.</d:message>
1016    </d:item>
1017    
1018    <d:item name="in table:#text"
1019        class="parse-error"
1020        modules="HTML::Parser">
1021      <d:message xml:lang="en">Non‐white‐space character is not allowed within
1022      the <code>table</code> element, outside of the caption and cells.</d:message>
1023      <d:desc xml:lang="en">
1024        <p>A non‐white‐space character appears in <code>table</code>.
1025        The document is non-conforming.</p>
1026    
1027        <p>In <code>table</code>, only table related elements
1028        are allowed; any other element and data character must be contained in
1029        <code>td</code> or <code>th</code> element to form
1030        a part of the table, or <code>caption</code> element to create
1031        a table caption.</p>
1032      </d:desc>
1033    </d:item>
1034    
1035    <d:item name="isindex"
1036        class="parse-error"
1037        modules="HTML::Parser">
1038      <d:message xml:lang="en">The <code>isindex</code> element is
1039      obsolete.</d:message>
1040    </d:item>
1041    
1042    <d:item name="missing start tag:tr"
1043        class="parse-error"
1044        modules="HTML::Parser">
1045      <d:message xml:lang="en">Start tag of <code>tr</code>
1046      element is missing.</d:message>
1047      <d:desc>
1048        <p>Start tag of a <code>tr</code> element, which is <em>not</em>
1049        optional, is missing.  The document is non-conforming.</p>
1050    
1051        <p>In a table section, a <code>&lt;tr></code> start tag
1052        must occur before any <code>&lt;td></code> or
1053        <code>&lt;th></code> start tag.  Though the HTML5 parser
1054        implies the <code>&lt;tr></code> start tag before
1055        these start tags, it must be explicitly specified.</p>
1056      </d:desc>
1057    </d:item>
1058    
1059  <d:item name="no DOCTYPE"  <d:item name="no DOCTYPE"
1060      class="parse-error">      class="parse-error"
1061    <d:message xml:lang="en">This document does not start with the      modules="HTML::Parser">
1062    <code>DOCTYPE</code> declaration.</d:message>    <d:message xml:lang="en">This document does not start with a
1063      <code>DOCTYPE</code>.</d:message>
1064      <d:desc>
1065        <p>The document does not start with a <code>DOCTYPE</code>.
1066        The document is non-conforming.</p>
1067    
1068        <p>An HTML document must start by a <code>DOCTYPE</code>:
1069          <pre class="html example"><code>&lt;!DOCTYPE HTML></code></pre>
1070        </p>
1071    
1072        <p>Only white space characters and comments are allowed
1073        before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
1074        allowed in HTML document.</p>
1075      </d:desc>
1076  </d:item>  </d:item>
1077    
1078  <d:item name="not closed"  <d:item name="not closed"
1079      class="parse-error">      class="parse-error"
1080    <d:message xml:lang="en">Element <code><var>$0</var></code> is not      modules="HTML::Parser">
1081      <d:message xml:lang="en">Element <code><var>{text}</var></code> is not
1082    closed.</d:message>    closed.</d:message>
1083      <d:desc>
1084        <p>End tag of an element is not found before, for example,
1085        an end tag of another element appears or
1086        the end of the document.  The document is non-conforming.</p>
1087    
1088        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
1089        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
1090        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
1091        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
1092        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
1093        <code>th</code>, <code>thead</code>, <code>tr</code>,
1094        <code>ul</code> end tag can be omitted in HTML documents.
1095        For any element except for void element, there must be an explicit
1096        end tag.</p>
1097    
1098        <dl class="switch">
1099        <dt>HTML <code>canvas</code> element</dt>
1100          <dd>Though the element is void in earlier versions of Safari,
1101          the <code>canvas</code> element is <em>no</em> longer
1102          defined as empty.  There must be an end tag
1103          <code class="html example">&lt;/canvas></code>.</dd>
1104        </dl>
1105    
1106        <p>Note that misnesting tags, such as
1107        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
1108        allowed and they also cause this error.</p>
1109      </d:desc>
1110    </d:item>
1111    
1112    <d:item name="not first start tag"
1113        class="parse-error"
1114        modules="HTML::Parser">
1115      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
1116      the first start tag.</d:message>
1117      <d:desc>
1118        <p>There is a start tag of the <code>html</code> element
1119        that it not the first start tag in the input stream.
1120        The document is non-conforming.</p>
1121    
1122        <p>In an HTML document, there cannot be more than one
1123        <code>html</code> element and therefore there cannot be
1124        more than one <code>&lt;html></code> tag.  In addition,
1125        nothing can be placed before the <code>&lt;html></code> tag
1126        except a <code>DOCTYPE</code>, white space characters,
1127        and comments.</p>
1128      </d:desc>
1129  </d:item>  </d:item>
1130    
1131  <d:item name="not HTML5"  <d:item name="not HTML5"
1132      class="parse-error">      class="parse-error"
1133        modules="HTML::Parser">
1134    <d:message xml:lang="en">This document is written in an old version of    <d:message xml:lang="en">This document is written in an old version of
1135    HTML.</d:message>    HTML.</d:message>
1136      <d:desc xml:lang="en">
1137        <p>The document contains a <code>DOCTYPE</code> declaration
1138        that is different from HTML5 <code>DOCTYPE</code> (i.e.
1139        <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
1140        The document is non‐conforming.</p>
1141    
1142        <p>The document might or might not be conformant to
1143        some version of HTML.  However, conformance to any HTML
1144        specification other than HTML5 provides for no practical
1145        convenience, since Web borwsers will parse any
1146        HTML document (roughly) as defined in HTML5.</p>
1147      </d:desc>
1148    </d:item>
1149    
1150    <d:item name="start tag not allowed"
1151        class="parse-error"
1152        modules="HTML::Parser">
1153      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
1154      not allowed here.</d:message>
1155  </d:item>  </d:item>
1156    
1157  <d:item name="unmatched end tag"  <d:item name="unmatched end tag"
1158      class="parse-error">      class="parse-error"
1159    <d:message xml:lang="en">Element <code><var>$0</var></code> is not      modules="HTML::Parser">
1160      <d:message xml:lang="en">Element <code><var>{text}</var></code> is not
1161    opened.</d:message>    opened.</d:message>
1162      <d:desc>
1163        <p>An end tag appears though no element with the same name
1164        has been opened.  The document is non-conforming.</p>
1165    
1166        <p>For any end tag in HTML document, there must be a
1167        corresponding start tag.</p>
1168    
1169        <dl class="switch">
1170        <dt>HTML <code>base</code>, <code>basefont</code>,
1171        <code>bgsound</code>, <code>br</code>, <code>col</code>,
1172        <code>embed</code>, <code>frame</code>, <code>hr</code>,
1173        <code>image</code>, <code>img</code>, <code>input</code>,
1174        <code>isindex</code>, <code>link</code>, <code>meta</code>,
1175        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
1176          <dd>End tag is not allowed for these elements, since
1177          those content must always be empty.  Remove end tag.</dd>
1178        <!-- keygen -->
1179        <!-- command, event-source, nest, source -->
1180        </dl>
1181      </d:desc>
1182  </d:item>  </d:item>
1183    
1184  </section>  </section>
# Line 88  Web Document Conformance Checker (BETA)< Line 1186  Web Document Conformance Checker (BETA)<
1186  <section id="element-content-model-errors">  <section id="element-content-model-errors">
1187  <h2>Element Content Model Errors</h2>  <h2>Element Content Model Errors</h2>
1188    
1189    <d:item name="basehref after URL attribute"
1190        modules="ContentChecker::HTML">
1191      <d:message xml:lang="en">The <code>base</code> element with the
1192      <code>href</code> attribute specified cannot be placed after
1193      any attribute with a URL.</d:message>
1194    </d:item>
1195    
1196    <d:item name="basetarget after hyperlink"
1197        modules="ContentChecker::HTML">
1198      <d:message xml:lang="en">The <code>base</code> element with the
1199      <code>target</code> attribute specified cannot be placed after
1200      any element that defines a hyperlink.</d:message>
1201    </d:item>
1202    
1203  <d:item name="character not allowed"  <d:item name="character not allowed"
1204      class="content-model-error">      modules="ContentChecker::HTML RDFXML">
1205    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
1206    context.</d:message>    context.</d:message>
1207    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1208      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
1209      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
1210    
1211      <p>Possible causes:      <p>Possible causes:
1212        <dl>        <ul>
1213        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
1214        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
1215            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
1216            of certain sectioning elements such as <code>body</code>,  
1217            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
1218          in e.g. paragraph element such as <code>p</code>.</p></li>
1219            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
1220            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
1221        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
1222        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
1223            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
1224            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
1225            <em>either one</em> of block-level or inline-level content        </ul>
           is allowed.  If there is a block-level content,  
           any inline-level content must be put  
           in e.g. paragraph element such as <code>p</code>.</p></dd>  
       </dl>  
1226      </p>      </p>
1227    </d:desc>    </d:desc>
1228  </d:item>  </d:item>
1229    
1230    <d:item name="character not allowed:empty"
1231        modules="ContentChecker::HTML">
1232      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1233      an empty element.</d:message>
1234    </d:item>
1235    
1236    <d:item name="character not allowed:atom|PersonConstruct"
1237        modules="ContentChecker::HTML">
1238      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1239      Person construct.</d:message>
1240    </d:item>
1241    
1242    <d:item name="character not allowed:atom|TextConstruct"
1243        modules="ContentChecker::HTML">
1244      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1245      Text construct.</d:message>
1246    </d:item>
1247    
1248  <d:item name="child element missing"  <d:item name="child element missing"
1249      class="content-model-error">      modules="ContentChecker::HTML ContentChecker::Atom">
1250    <d:message xml:lang="en">There must be a <code><var>$0</var></code>    <d:message xml:lang="en">There must be an element
1251    element as a child of this element.</d:message>    <code><var>{text}</var></code> as a child of this element.</d:message>
1252    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1253      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
1254      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
1255      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
1256    
1257      <p>For example:      <dl class="switch">
1258        <ul>      <dt>HTML <code>head</code> element</dt>
1259        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
1260        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
1261        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
1262        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
1263        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
1264        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
1265      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
1266        </dl>
1267    </d:desc>    </d:desc>
1268  </d:item>  </d:item>
1269    
# Line 146  Web Document Conformance Checker (BETA)< Line 1273  Web Document Conformance Checker (BETA)<
1273    or <code>th</code> element as a child of this element.</d:message>    or <code>th</code> element as a child of this element.</d:message>
1274    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1275      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
1276      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
1277      such an element, the document is non-conforming.</p>      is non-conforming.</p>
1278    </d:desc>    </d:desc>
1279  </d:item>  </d:item>
1280    
1281    <d:item name="child element missing:atom"
1282        modules="ContentChecker::HTML">
1283      <d:message xml:lang="en">There must be an element
1284      <code><var>{text}</var></code> in the Atom namespace as a child of this
1285      element.</d:message>
1286    </d:item>
1287    
1288    <d:item name="child element missing:atom:link:alternate"
1289        modules="ContentChecker::HTML">
1290      <d:message xml:lang="en">There must be an Atom <code>link</code> element
1291      whose <code>rel</code> attribute is set to <code>alternate</code> as a
1292      child of this element.</d:message>
1293    </d:item>
1294    
1295    <d:item name="child element missing:atom:link:self"
1296        modules="ContentChecker::HTML">
1297      <d:message xml:lang="en">There should be an Atom <code>link</code> element
1298      whose <code>rel</code> attribute is set to <code>self</code> as a
1299      child of this element.</d:message>
1300    </d:item>
1301    
1302    <d:item name="element missing:hn"
1303        modules="ContentChecker::HTML">
1304      <d:message xml:lang="en">There must be at least one
1305      <code>h<var>n</var></code> element descendant.</d:message>
1306    </d:item>
1307    
1308  <d:item name="element not allowed"  <d:item name="element not allowed"
1309      class="content-model-error">      modules="ContentChecker::HTML ContentChecker::Atom RDFXML">
1310    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
1311    context.</d:message>    context.</d:message>
1312    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1313      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
1314      is non-conforming.</p>      is non-conforming.</p>
1315    
1316      <p>Possible causes:      <p>Possible causes:
1317        <dl>        <dl class="switch">
1318        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
1319        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
1320            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
1321            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
1322            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
1323    
1324            <p>Any inline-level content must be put            <p>Any inline-level content must be put
1325            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
1326        <dt>If the erred element is a block-level element (such as        <dt>If it is a block-level elements, such as <code>aside</code>,
1327        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
1328            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
1329            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
1330            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
1331            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
1332            any inline-level content must be put                <!-- @@ TODO: more... -->
1333            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
1334        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
1335            <dd><p>In an XHTML document, the root <code>html</code>                    block-level or inline-level content.  If there is a
1336            element must have an <code>xmlns</code> attribute                    block-level content, any inline-level content must be
1337            whose value is set to                    put in e.g. paragraph element such as <code>p</code>.</p>
1338            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>                    <p>For example, an HTML document fragment
1339                      <code class="html bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
1340                      is non-conforming, since a word <q>World!</q> does not belong
1341                      to any paragraph.  (If not part of any paragraph, what is
1342                      it!?)  A conforming example would be:
1343                        <pre class="html example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
1344                      </p></dd>
1345                  <dt>If the parent element does <em>not</em> allow
1346                  block-level elements as content</dt>
1347                      <dd>The element is not allowed to be inserted here.
1348                      For example, a <code>div</code> element cannot be
1349                      a child of an <code>h1</code> element.</dd>
1350              </dl></dd>
1351          <dt>If the element with the error is a <code>noscript</code> element</dt>
1352              <dd>The <code>noscript</code> element is allowed only in the context
1353              where a block-level or inline-level content is expected
1354              and in the <code>head</code> element.
1355              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
1356              or <code>select</code>.</dd>
1357          <dt>If the element with the error is <code>blink</code>,
1358          <code>center</code>, or <code>marquee</code> element</dt>
1359              <dd>These elements are not part of the HTML standard.
1360              Use CSS for styling control.</dd>
1361    
1362          <dt><code>button</code>, <code>datalist</code>,
1363          <code>fieldset</code>, <code>form</code>,
1364          <code>input</code>, <code>label</code>,
1365          <code>optgroup</code>, <code>option</code>, <code>output</code>,
1366          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
1367          <code>textarea</code>, or <code>textarea</code> element</dt>
1368          <!-- rbc, rtc ? -->
1369              <dd>These elements are intentionally not supported by the conformance
1370              checker <em>yet</em>.</dd>
1371        </dl>        </dl>
1372      </p>      </p>
1373    </d:desc>    </d:desc>
1374  </d:item>  </d:item>
1375    
1376    <d:item name="element not allowed:area"
1377        modules="ContentChecker ContentChecker::HTML">
1378      <d:message xml:lang="en">An <code>area</code> element cannot be used
1379      outside of a <code>map</code> element.</d:message>
1380    </d:item>
1381    
1382    <d:item name="element not allowed:base"
1383        modules="ContentChecker ContentChecker::HTML">
1384      <d:message xml:lang="en">There is another <code>base</code>
1385      element.</d:message>
1386    </d:item>
1387    
1388    <d:item name="element not allowed:datatemplate"
1389        modules="ContentChecker ContentChecker::HTML">
1390      <d:message xml:lang="en">In a <code>datatemplate</code> element, only
1391      <code>rule</code> elements are allowed.</d:message>
1392    </d:item>
1393    
1394    <d:item name="element not allowed:details legend"
1395        modules="ContentChecker::HTML">
1396      <d:message xml:lang="en">In a <code>details</code> element, only at the
1397      beginning of the element a <code>lengend</code> element
1398      may be used.</d:message>
1399    </d:item>
1400    
1401    <d:item name="element not allowed:empty"
1402        modules="ContentChecker::HTML ContentChecker::Atom">
1403      <d:message xml:lang="en">Elements are not allowed in an empty
1404      element.</d:message>
1405    </d:item>
1406    
1407    <d:item name="element not allowed:figure legend"
1408        modules="ContentChecker::HTML">
1409      <d:message xml:lang="en">In a <code>figure</code> element, only at the
1410      beginning or only at the end of the element a <code>lengend</code> element
1411      may be used.</d:message>
1412    </d:item>
1413    
1414    <d:item name="element not allowed:flow"
1415        modules="ContentChecker::HTML">
1416      <d:message xml:lang="en">This element is not allowed where flow
1417      content is expected.</d:message>
1418    </d:item>
1419    
1420    <d:item name="element not allowed:flow style"
1421        modules="ContentChecker::HTML">
1422      <d:message xml:lang="en">A <code>style</code> element without
1423      <code>scoped</code> attribute is not allowed in this context.</d:message>
1424    </d:item>
1425    
1426    <d:item name="element not allowed:head noscript"
1427        modules="ContentChecker::HTML">
1428      <d:message xml:lang="en">This element is not allowed in a
1429      <code>noscript</code> element in the <code>head</code> element.</d:message>
1430    </d:item>
1431    
1432    <d:item name="element not allowed:head style"
1433        modules="ContentChecker::HTML">
1434      <d:message xml:lang="en">A <code>style</code> element with
1435      <code>scoped</code> attribute is not allowed in the <code>head</code>
1436      element.</d:message>
1437    </d:item>
1438    
1439    <d:item name="element not allowed:head title"
1440        modules="ContentChecker ContentChecker::HTML">
1441      <d:message xml:lang="en">There is another <code>title</code>
1442      element.</d:message>
1443    </d:item>
1444    
1445    <d:item name="element not allowed:minus"
1446        modules="ContentChecker ContentChecker::HTML">
1447      <d:message xml:lang="en">This element is not allowed in this
1448      context.</d:message>
1449    </d:item>
1450    
1451    <d:item name="element not allowed:meta charset"
1452        modules="ContentChecker::HTML">
1453      <d:message xml:lang="en">The character encoding declaration must be the
1454      first element in the <code>head</code> element.</d:message>
1455    </d:item>
1456    
1457    <d:item name="element not allowed:metadata"
1458        modules="ContentChecker::HTML">
1459      <d:message xml:lang="en">This element is not allowed where metadata
1460      content is expected.</d:message>
1461    </d:item>
1462    
1463    <d:item name="element not allowed:phrasing"
1464        modules="ContentChecker::HTML">
1465      <d:message xml:lang="en">This element is not allowed where phrasing
1466      content is expected.</d:message>
1467    </d:item>
1468    
1469    <d:item name="element not allowed:root"
1470        modules="ContentChecker">
1471      <d:message xml:lang="en">This element is not allowed as the root
1472      element of a document.</d:message>
1473      <d:desc xml:lang="en">
1474        <p>An element that is not allowed as the root element
1475        is used as the root element of the document.  The document is
1476        non-conforming, as far as the conformance checker can tell.</p>
1477    
1478        <dl class="switch">
1479        <dt><code>html</code> element in an XHTML document</dt>
1480            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
1481            element must have an <code>xmlns</code> attribute as:
1482              <pre class="xml example"><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"></code></pre></p></dd>
1483        <dt><code>rss</code> element</dt>
1484            <dd><p>The document is written in some version of RSS.</p>
1485            <p>The conformance checker does not support any version
1486            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
1487        <dt><code>feed</code> element</dt>
1488            <dd><p>The Atom <code>feed</code> element must be
1489            in the <code>http://www.w3.org/2005/Atom</code>
1490            namespace as:
1491              <pre class="xml example"><code>&lt;feed xmlns="http://www.w3.org/2005/Atom"></code></pre>
1492            </p>
1493            <p>The conformance checker does not support Atom 0.3.
1494            Use Atom 1.0 for feed documents.</p></dd>
1495        </dl>
1496      </d:desc>
1497    </d:item>
1498    
1499    <d:item name="element not allowed:root:xml"
1500        modules="ContentChecker">
1501      <d:message xml:lang="en">This element is not allowed as the root element
1502      of an XML document.</d:message>
1503    </d:item>
1504    
1505    <d:item name="element not allowed:ruby base"
1506        modules="ContentChecker">
1507      <d:message xml:lang="en">This element is not allowed in the <code>ruby</code>
1508      element.</d:message>
1509    </d:item>
1510    
1511    <d:item name="element not allowed:text"
1512        modules="ContentChecker::HTML">
1513      <d:message xml:lang="en">This element is not allowed in this
1514      context.</d:message>
1515    </d:item>
1516    
1517    <d:item name="element not allowed:atom|content"
1518        modules="ContentChecker::Atom">
1519      <d:message xml:lang="en">This element is not allowed in an Atom
1520      <code>content</code> element.</d:message>
1521    </d:item>
1522    
1523    <d:item name="element not allowed:atom|PersonConstruct"
1524        modules="ContentChecker::Atom">
1525      <d:message xml:lang="en">This element is not allowed in Person
1526      construct.</d:message>
1527    </d:item>
1528    
1529    <d:item name="element not allowed:atom|TextConstruct"
1530        modules="ContentChecker::Atom">
1531      <d:message xml:lang="en">This element is not allowed in Text
1532      construct.</d:message>
1533    </d:item>
1534    
1535    <d:item name="element not defined"
1536        modules="ContentChecker">
1537      <d:message xml:lang="en">This element is not defined.</d:message>
1538    </d:item>
1539    
1540    <d:item name="no significant content"
1541        modules="ContentChecker::HTML">
1542      <d:message xml:lang="en">No significant content is contained
1543      in this element.</d:message>
1544    </d:item>
1545    
1546    <d:item name="no significant content before"
1547        modules="ContentChecker::HTML">
1548      <d:message xml:lang="en">There is no significant content
1549      before this element.</d:message>
1550    </d:item>
1551    
1552    <d:item name="no significant content at the end"
1553        modules="ContentChecker::HTML">
1554      <d:message xml:lang="en">No significant content is contained
1555      at the end of this element.</d:message>
1556    </d:item>
1557    
1558    <d:item name="ps element missing"
1559        modules="ContentChecker::HTML">
1560      <d:message xml:lang="en">There is no <code><var>{text}</var></code>
1561      element before this element.</d:message>
1562      <d:desc xml:lang="en">
1563        <p>There must be an element before another element, but there
1564        is not.  The document is non-conforming.</p>
1565    
1566        <p>For example, there must be a <code>dt</code> element
1567        before any <code>dd</code> element.</p>
1568      </d:desc>
1569    </d:item>
1570    
1571    <d:item name="rp:syntax error"
1572        modules="ContentChecker::HTML">
1573      <d:message xml:lang="en">The content of a <code>rp</code> element must
1574      be a parenthesis.</d:message>
1575    </d:item>
1576    
1577    </section>
1578    
1579    <section id="attribute-errors">
1580    <h2>Attribute Errors</h2>
1581    
1582    <d:item name="attribute missing"
1583        modules="ContentChecker::HTML">
1584      <d:message xml:lang="en">Required attribute <code><var>{text}</var></code>
1585      is not specified.</d:message>
1586      <d:desc>
1587        <p>A required attribute is not specified.  The document
1588        is non-conforming.</p>
1589    
1590        <p>Some attribute is defined as <i>required</i>.
1591        Without required attributes specified, user agents
1592        cannot provide full functionality of the element to the user.</p>
1593    
1594        <dl class="switch">
1595        <dt>HTML <code>img</code> element</dt>
1596            <dd>The <code>src</code> attribute must be specified.
1597            Additionally, the <code>alt</code> attribute must be specified
1598            in many cases.</dd>
1599        <dt>HTML <code>link</code> element</dt>
1600            <dd>The <code>rel</code> attribute must be specified.
1601            Note that the <code>rev</code> attribute is obsolete.</dd>
1602        </dl>
1603      </d:desc>
1604    </d:item>
1605    
1606    <d:item name="attribute missing:data|type"
1607        modules="ContentChecker::HTML">
1608      <d:message xml:lang="en">For an <code>object</code> at least one of
1609      <code>data</code> and <code>type</code> attributes must be
1610      specified.</d:message>
1611    </d:item>
1612    
1613    <d:item name="attribute missing:href|target"
1614        modules="ContentChecker::HTML">
1615      <d:message xml:lang="en">For a <code>base</code> element, at least one of
1616      <code>href</code> and <code>target</code> attributes must be
1617      specified.</d:message>
1618    </d:item>
1619    
1620    <d:item name="attribute missing:name|http-equiv"
1621        modules="ContentChecker::HTML">
1622      <d:message xml:lang="en">For a <code>meta</code> element with the
1623      <code>content</code> attribute specified, exactly one of
1624      <code>name</code> and <code>http-equiv</code> attributes must be
1625      specified.</d:message>
1626    </d:item>
1627    
1628    <d:item name="attribute missing:name|http-equiv|charset"
1629        modules="ContentChecker::HTML">
1630      <d:message xml:lang="en">For a <code>meta</code> element, exactly one of
1631      <code>name</code>, <code>http-equiv</code>, and <code>charset</code>
1632      attributes must be specified.</d:message>
1633    </d:item>
1634    
1635    <d:item name="attribute not allowed"
1636        modules="ContentChecker::HTML RDFXML">
1637      <d:message xml:lang="en">Attribute
1638      <code><var>{local-name}</var></code> is not allowed for
1639      <code><var>{element-local-name}</var></code> element.</d:message>
1640      <d:desc xml:lang="en">
1641        <p>An attribute is specified where it is not allowed.
1642        The document is non-conforming.</p>
1643    
1644        <dl>
1645        <dt>HTML <code>meta</code> element</dt>
1646            <dd>For HTML <code>meta</code> element, <em>only one</em> of
1647            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
1648            attribute is allowed.</dd>
1649        </dl>
1650      </d:desc>
1651    </d:item>
1652    
1653    <d:item name="attribute not allowed:ismap"
1654        modules="ContentChecker::HTML">
1655      <d:message xml:lang="en">The <code>ismap</code> attribute may only be
1656      used for the image contained in an <code>a</code> element.</d:message>
1657    </d:item>
1658    
1659    <d:item name="attribute not defined"
1660        modules="ContentChecker">
1661      <d:message xml:lang="en">This attribute is not defined.</d:message>
1662    </d:item>
1663    
1664    <d:item name="in HTML:xml:lang"
1665        class="attribute-error"
1666        modules="ContentChecker::XML">
1667      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
1668      allowed in HTML document.</d:message>
1669      <d:desc xml:lang="en">
1670        <p>The <code>xml:lang</code> attribute is not allowed in
1671        HTML document.  The document is non-conforming.</p>
1672    
1673        <p>Use of the <code>xml:lang</code> attribute is conforming
1674        <em>only</em> in XML documents.</p>
1675    
1676        <p>To specify natural language information in HTML document,
1677        use <code>lang</code> attribute instead.</p>
1678    
1679        <p>XHTML 1.0 Appendix C was encouraged to specify both
1680        <code>lang</code> and <code>xml:lang</code> attributes with
1681        the same value.  Such a duplication has <em>no effect</em> in practice.
1682        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
1683        XML).</p>
1684    
1685        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
1686             from an HTML document? -->
1687      </d:desc>
1688    </d:item>
1689    
1690    <d:item name="in XML:charset"
1691        modules="ContentChecker::HTML">
1692      <d:message xml:lang="en">The <code>charset</code> attribute is not
1693      allowed in XML document.</d:message>
1694      <d:desc>
1695        <p>The <code>charset</code> attribute of a
1696        <code>meta</code> element is not allowed in XML document.
1697        The document is non-conforming.</p>
1698    
1699        <p>To specify the character encoding used for serialization,
1700        if necessary, use XML declaration instead:
1701          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
1702        </p>
1703      </d:desc>
1704    </d:item>
1705    
1706    <d:item name="in XML:lang"
1707        modules="ContentChecker::HTML">
1708      <d:message xml:lang="en">The <code>lang</code> attribute is not
1709      allowed in XML document.</d:message>
1710      <d:desc>
1711        <p>The HTML <code>lang</code> attribute is not allowed in
1712        XML document.  The document is non-conforming.</p>
1713    
1714        <p>The <code>lang</code> attribute in <code>null</code>
1715        namespace for HTML elements is conforming <em>only</em> in
1716        HTML documents.</p>
1717    
1718        <p>To specify natural language information in XML document,
1719        use <code>xml:lang</code> attribute instead.</p>
1720      </d:desc>
1721    </d:item>
1722    
1723    <d:item name="in XML:noscript"
1724        modules="ContentChecker::HTML">
1725      <d:message xml:lang="en">A <code>noscript</code> element cannot be
1726      used in XML document.</d:message>
1727    </d:item>
1728    
1729    <d:item name="in XML:xmlns"
1730        modules="ContentChecker::HTML">
1731      <d:message xml:lang="en">The <code>xmlns</code> attribute
1732      in the <code>null</code> namespace is not allowed in
1733      XHTML document.  The document is non-conforming.</d:message>
1734      <d:desc>
1735        <p>The <code>xmlns</code> attribute in the <code>null</code>
1736        namespace is not allowed in XHTML document.</p>
1737    
1738        <p>This error should not occur in conformance-checking of
1739        static documents.</p>
1740      </d:desc>
1741    </d:item>
1742    
1743  </section>  </section>
1744    
1745  <section id="attribute-value-errors">  <section id="attribute-value-errors">
1746  <h2>Attribute Value Errors</h2>  <h2>Attribute Value Errors</h2>
1747    
1748    <d:item name="boolean:invalid"
1749        modules="ContentChecker::HTML">
1750      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
1751      is not allowed.  It must be an empty string or a string
1752      <code><var>{local-name}</var></code>.</d:message>
1753    </d:item>
1754    
1755    <d:item name="char:syntax error"
1756        modules="ContentChecker::HTML">
1757      <d:message xml:lang="en">The attribute value must be exactly one
1758      character.</d:message>
1759    </d:item>
1760    
1761    <d:item name="charref in charset"
1762        modules="ContentChecker::HTML">
1763      <d:message xml:lang="en">A character reference cannot be used to
1764      represent a character encoding name.</d:message>
1765    </d:item>
1766    
1767    <d:item name="charset:not preferred"
1768        modules="ContentChecker::HTML">
1769      <d:message xml:lang="en">Character encoding name
1770      <code><var>{value}</var></code> is not the preferred name of that
1771      character encoding.</d:message>
1772    </d:item>
1773    
1774    <d:item name="charset:not registered"
1775        modules="ContentChecker::HTML">
1776      <d:message xml:lang="en">Character encoding name
1777      <code><var>{value}</var></code> is not a registered name.</d:message>
1778      <d:desc xml:lang="en">
1779        <p>The specified character encoding name is not registered to
1780        <abbr>IANA</abbr>.  Use of registered character encoding name
1781        is a good practice to facilitate interoperability.</p>
1782    
1783        <dl class="switch">
1784        <dt><code>EUC-TW</code></dt>
1785          <dd><code>EUC-TW</code> is not registered.  Unfortunately, there
1786          is no registered name for that character encoding.  Use
1787          Big5 encoding with character encoding name <code>Big5</code>
1788          if it is enough to represent the document.</dd>
1789        <dt><code>ISO-2022-JP-1</code></dt>
1790          <dd><code>ISO-2022-JP-1</code> is not registered, nevertheless
1791          this character encoding name is documented in
1792          <a href="urn:ietf:rfc:2237"><abbr>RFC</abbr> 2237</a>.  Use
1793          <code>ISO-2022-JP-2</code> instead, since that character encoding
1794          is a superset of ISO-2022-JP-1.</dd>
1795        <dt><code>ISO-2022-JP-3</code>, <code>ISO-2022-JP-3-plane1</code></dt>
1796          <dd>These names are not registered and obsoleted in favor of
1797          <code>ISO-2022-JP-2004</code> and
1798          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1799        <dt><code>ISO-2022-JP-2003</code>,
1800        <code>ISO-2022-JP-2003-plane1</code></dt>
1801          <dd>These names are not registered and corrected to
1802          <code>ISO-2022-JP-2004</code> and
1803          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1804        <dt><code>ISO-2022-JP-2004</code>,
1805        <code>ISO-2022-JP-2004-plane1</code></dt>
1806          <dd>These names are not registered.  Unfortunately, there is
1807          no registered name for these character encodings.</dd>
1808        <dt><code>UTF-8N</code></dt>
1809          <dd><code>UTF-8N</code> is not registered.  Character encoding
1810          name <code>UTF-8</code> represents UTF-8 encoding with or
1811          without <abbr>BOM</abbr>.</dd>
1812        </dl>
1813    
1814        <p><strong>WARNING</strong>: This error might be raised for
1815        a registered character encoding name, since the character encoding
1816        name database of the conformance checker is not complete yet.</p>
1817      </d:desc>
1818    </d:item>
1819    
1820    <d:item name="charset:private"
1821        modules="ContentChecker::HTML">
1822      <d:message xml:lang="en">Character encoding name
1823      <code><var>{value}</var></code> is a private name.</d:message>
1824      <d:desc xml:lang="en">
1825        <p>The specified character encoding name is a private name and
1826        not registered to <abbr>IANA</abbr>.  Use of registered character
1827        encoding name is a good practice to facilitate interoperability.</p>
1828    
1829        <dl class="switch">
1830        <dt><code>x-euc-jp</code></dt>
1831          <dd>Use <code>EUC-JP</code> for the Japanese <abbr>EUC</abbr>
1832          character encoding.</dd>
1833        <dt><code>x-sjis</code></dt>
1834          <dd>Use <code>Shift_JIS</code> for standard Shift encoding scheme of
1835          <abbr>JIS</abbr> coded character set, or <code>Windows-31J</code>
1836          for Microsoft standard character set as implemented by
1837          Microsoft Windows.</dd>
1838        </dl>
1839      </d:desc>
1840    </d:item>
1841    
1842    <d:item name="charset:syntax error"
1843        modules="ContentChecker::HTML">
1844      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
1845      is syntactically not a character encoding name.</d:message>
1846      <d:desc xml:lang="en">
1847        <p>The attribute value must be a character encoding name.  However,
1848        the specified value is not a character encoding name syntactically.
1849        The document is non‐conforming.</p>
1850        <p>Character encoding name is a string of <abbr>ASCII</abbr>
1851        printable characters, up to 40 characters.</p>
1852      </d:desc>
1853    </d:item>
1854    
1855    <d:item name="color:syntax error"
1856        modules="ContentChecker::HTML">
1857      <d:message xml:lang="en">The specified value is not a color
1858      name or hexadecimal color number.</d:message>
1859    </d:item>
1860    
1861    <d:item name="coords:number not 3"
1862        modules="ContentChecker::HTML">
1863      <d:message xml:lang="en">The <code>coords</code> attribute have to
1864      contain three (3) numbers (specified:
1865      <code><var>{text}</var></code>).</d:message>
1866    </d:item>
1867    
1868    <d:item name="coords:number not 4"
1869        modules="ContentChecker::HTML">
1870      <d:message xml:lang="en">The <code>coords</code> attribute have to
1871      contain four (4) numbers (specified:
1872      <code><var>{text}</var></code>).</d:message>
1873    </d:item>
1874    
1875    <d:item name="coords:number lt 6"
1876        modules="ContentChecker::HTML">
1877      <d:message xml:lang="en">The <code>coords</code> attribute have to
1878      contain more than or equal to six (6) numbers (specified:
1879      <code><var>{text}</var></code>).</d:message>
1880    </d:item>
1881    
1882    <d:item name="coords:number not even"
1883        modules="ContentChecker::HTML">
1884      <d:message xml:lang="en">The <code>coords</code> attribute have to
1885      contain even number of numbers (specified:
1886      <code><var>{text}</var></code>).</d:message>
1887    </d:item>
1888    
1889    <d:item name="coords:out of range"
1890        modules="ContentChecker::HTML">
1891      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
1892      is out of range.</d:message>
1893    </d:item>
1894    
1895    <d:item name="coords:syntax error"
1896        modules="ContentChecker::HTML">
1897      <d:message xml:lang="en">The specified value is not valid.</d:message>
1898    </d:item>
1899    
1900    <d:item name="datetime:bad year"
1901        modules="ContentChecker::HTML">
1902      <d:message xml:lang="en">Year number is out of range.</d:message>
1903    </d:item>
1904    
1905    <d:item name="datetime:bad month"
1906        modules="ContentChecker::HTML">
1907      <d:message xml:lang="en">Month number is out of range.</d:message>
1908    </d:item>
1909    
1910    <d:item name="datetime:bad day"
1911        modules="ContentChecker::HTML">
1912      <d:message xml:lang="en">Day number is out of range.</d:message>
1913    </d:item>
1914    
1915    <d:item name="datetime:bad hour"
1916        modules="ContentChecker::HTML">
1917      <d:message xml:lang="en">Hour number is out of range.</d:message>
1918    </d:item>
1919    
1920    <d:item name="datetime:bad minute"
1921        modules="ContentChecker::HTML">
1922      <d:message xml:lang="en">Minute number is out of range.</d:message>
1923    </d:item>
1924    
1925    <d:item name="datetime:bad second"
1926        modules="ContentChecker::HTML">
1927      <d:message xml:lang="en">Second number is out of range.</d:message>
1928    </d:item>
1929    
1930    <d:item name="datetime:bad timezone hour"
1931        modules="ContentChecker::HTML">
1932      <d:message xml:lang="en">Hour number of the timezone component is out of
1933      range.</d:message>
1934    </d:item>
1935    
1936    <d:item name="datetime:bad timezone minute"
1937        modules="ContentChecker::HTML">
1938      <d:message xml:lang="en">Minute number of the timezone component is out of
1939      range.</d:message>
1940    </d:item>
1941    
1942    <d:item name="datetime:syntax error"
1943        modules="ContentChecker::HTML">
1944      <d:message xml:lang="en">The attribute value is not a datetime.</d:message>
1945    </d:item>
1946    
1947    <d:item name="dateortime:syntax error"
1948        modules="ContentChecker::HTML">
1949      <d:message xml:lang="en">The attribute value is not a date or
1950      time.</d:message>
1951    </d:item>
1952    
1953  <d:item name="enumerated:invalid"  <d:item name="enumerated:invalid"
1954      class="attribute-error">      modules="ContentChecker::HTML">
1955    <d:message xml:lang="en">This attribute only allow a limited set of    <d:message xml:lang="en">This attribute only allow a limited set of
1956    values and the specified value is not one of them.</d:message>    values and the specified value <code><var>{@}</var></code> is not one
1957      of them.</d:message>
1958      <d:desc xml:lang="en">
1959        <p>For this attribute only several values are allowed and the
1960        value of the attribute is not one of them.  The document
1961        is non-conforming.</p>
1962    
1963        <dl>
1964        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
1965            <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
1966            are allowed.</p>
1967            <p>Value <code>Content-Type</code> is obsolete; for charset
1968            declaration, the <code>charset</code> attribute can be used as:
1969            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1970            ... where <var>charset-name</var> is a name of the character encoding
1971            of the document, such as <code>utf-8</code>.</p>
1972            <p>Values <code>Content-Style-Type</code> and
1973            <code>Content-Script-Type</code> are currently not allowed.</p>
1974            <p>Value <code>Keywords</code> is not allowed.  Use
1975            <code>name</code> attribute instead of <code>http-equiv</code>
1976            attribute.</p>
1977            <p>Values <code>Expires</code>, <code>Pragma</code>,
1978            and <code>Cache-Control</code> are not allowed;
1979            use <em>real</em> HTTP header fields for cache control.</p></dd>
1980        </dl>
1981      </d:desc>
1982    </d:item>
1983    
1984    <d:item name="enumerated:invalid:http-equiv:content-type"
1985        class="attribute-value-error">
1986      <d:message xml:lang="en">Character encoding declaration syntax
1987      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1988      is obsolete.</d:message>
1989      <d:desc xml:lang="en">
1990        <p>Old long character encoding declaration syntax
1991        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1992        is in use.  The document is non‐conforming.</p>
1993    
1994        <p>The new character encoding declaration syntax is:
1995          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1996        </p>
1997      </d:desc>
1998    </d:item>
1999    
2000    <d:item name="enumerated:non-conforming"
2001        modules="ContentChecker::HTML">
2002      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
2003      is not allowed.</d:message>
2004    </d:item>
2005    
2006    <d:item name="duplicate http-equiv"
2007        modules="ContentChecker::HTML">
2008      <d:message xml:lang="en">There is another pragma
2009      <code><var>{value}</var></code>.</d:message>
2010    </d:item>
2011    
2012    <d:item name="duplicate ID"
2013        class="attribute-value-error"
2014        modules="ContentChecker::XML ContentChecker::HTML">
2015      <d:message xml:lang="en">This identifier has already been
2016      assigned to another element.</d:message>
2017      <!-- @@ <id=a xml:id=a>? -->
2018    </d:item>
2019    
2020    <d:item name="duplicate token"
2021        modules="ContentChecker::HTML HTML::Table">
2022      <d:message xml:lang="en">The token <code><var>{value}</var></code>
2023      appears in the attribute value twice.</d:message>
2024    </d:item>
2025    
2026    <d:item name="empty attribute value"
2027        modules="ContentChecker::HTML">
2028      <d:message xml:lang="en">The attribute value must not be empty.</d:message>
2029    </d:item>
2030    
2031    <d:item name="float:out of range"
2032        modules="ContentChecker::HTML">
2033      <d:message xml:lang="en">The specified value is out of range.</d:message>
2034    </d:item>
2035    
2036    <d:item name="float:syntax error"
2037        modules="ContentChecker::HTML">
2038      <d:message xml:lang="en">The attribute value is not a real
2039      number.</d:message>
2040    </d:item>
2041    
2042    <d:item name="fragment points itself"
2043        modules="ContentChecker">
2044      <d:message xml:lang="en">A fragment identifier references the element
2045      itself.</d:message>
2046    </d:item>
2047    
2048    <d:item name="fragment points nothing"
2049        modules="ContentChecker">
2050      <d:message xml:lang="en">A fragment identifier references no
2051      node.</d:message>
2052    </d:item>
2053    
2054    <d:item name="hashref:syntax error"
2055        modules="ContentChecker::HTML">
2056      <d:message xml:lang="en">A hash−name reference must start with a
2057      <code>#</code> character.</d:message>
2058    </d:item>
2059    
2060    <d:item name="id ne name"
2061        modules="ContentChecker::HTML">
2062      <d:message xml:lang="en">The <code>id</code> attribute value is
2063      different from the <code>name</code> attribute value.</d:message>
2064    </d:item>
2065    
2066    <d:item name="integer:syntax error"
2067        modules="ContentChecker::HTML">
2068      <d:message xml:lang="en">The attribute value is not an integer.</d:message>
2069    </d:item>
2070    
2071    <d:item name="link type:bad context"
2072        modules="ContentChecker::HTML">
2073      <d:message xml:lang="en">The link type <code><var>{value}</var></code>
2074      cannot be specified for this element.</d:message>
2075      <d:desc xml:lang="en">
2076        <p>The specified link type cannot be used for the element.
2077        The document is non-conforming.</p>
2078    
2079        <p>Link types are associated with limited set of elements.
2080        They cannot be used with other elements.</p>
2081    
2082        <p>For example, link type <code>bookmark</code>
2083        can be used with <code>a</code> or <code>area</code> element,
2084        while it cannot be used with <code>link</code> element.</p>
2085      </d:desc>
2086    </d:item>
2087    
2088    <d:item name="invalid attribute value"
2089        class="attribute-value-error"
2090        modules="ContentChecker::XML ContentChecker::HTML ContentChecker::Atom">
2091      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
2092      is not an allowed value.</d:message>
2093    </d:item>
2094    
2095    <d:item name="length:syntax error"
2096        modules="ContentChecker::HTML">
2097      <d:message xml:lang="en">The attribute value is not a length
2098      value.</d:message>
2099    </d:item>
2100    
2101    <d:item name="link type:non-conforming"
2102        modules="ContentChecker::HTML">
2103      <d:message xml:lang="en">The link type <code><var>{value}</var></code>
2104      is non-conforming.</d:message>
2105      <d:desc xml:lang="en">
2106        <p>The specified link type is non-conforming, and therefore
2107        the document is non-conforming.</p>
2108    
2109        <dl class="switch">
2110        <dt>Link type <code>contents</code></dt>
2111          <dd>Use link type <code>index</code>.</dd>
2112        <dt>Link type <code>copyright</code></dt>
2113          <dd>Use link type <code>license</code>.</dd>
2114        <dt>Link type <code>home</code></dt>
2115          <dd>Use link type <code>index</code>.</dd>
2116        <dt>Link type <code>previous</code></dt>
2117          <dd>Use link type <code>prev</code>.</dd>
2118        <dt>Link type <code>start</code></dt>
2119          <dd>Use link type <code>first</code>.</dd>
2120        <dt>Link type <code>toc</code> or <code>top</code></dt>
2121          <dd>Use link type <code>index</code>.</dd>
2122        </dl>
2123      </d:desc>
2124    </d:item>
2125    
2126    <d:item name="meta content-type syntax error"
2127        modules="ContentChecker::HTML">
2128      <d:message xml:lang="en">The specified value is not a valid as a long
2129      character encoding declaration.</d:message>
2130    </d:item>
2131    
2132    <d:item name="mismatched charset name"
2133        modules="ContentChecker::HTML">
2134      <d:message xml:lang="en">The specified character encoding name
2135      <code><var>{value}</var></code> is different from the actual document
2136      character encoding <code><var>{text}</var></code>.</d:message>
2137      <d:desc xml:lang="en">
2138        <p>The specified character encoding name is different from
2139        the character encoding of the document.  The document
2140        is non‐conforming.</p>
2141      </d:desc>
2142    </d:item>
2143    
2144    <d:item name="mismatched charset name not checked"
2145        mopdules="ContentChecker::HTML">
2146      <d:message xml:lang="en">Whether the specified character encoding name
2147      <code><var>{value}</var></code> matches to the actual character encoding
2148      name cannot be checked since the input is not a byte stream.</d:message>
2149    </d:item>
2150    
2151    <d:item name="mode:syntax error"
2152        modules="ContentChecker::HTML">
2153      <d:message xml:lang="en">The attribute value is not a valid mode
2154      name.</d:message>
2155    </d:item>
2156    
2157    <d:item name="nninteger:out of range"
2158        modules="ContentChecker::HTML">
2159      <d:message xml:lang="en">The specified value is out of range.</d:message>
2160    </d:item>
2161    
2162    <d:item name="nninteger:syntax error"
2163        modules="ContentChecker::HTML">
2164      <d:message xml:lang="en">The attribute value is not a non‐negative
2165      integer.</d:message>
2166    </d:item>
2167    
2168    <d:item name="no referenced map"
2169        modules="ContentChecker">
2170      <d:message xml:lang="en">The <code>usemap</code> attribute references
2171      no image map.</d:message>
2172    </d:item>
2173    
2174    <d:item name="no referenced menu"
2175        modules="ContentChecker">
2176      <d:message xml:lang="en">The <code>contextmenu</code> attribute references
2177      no menu.</d:message>
2178    </d:item>
2179    
2180    <d:item name="no referenced header cell"
2181        modules="ContentChecker">
2182      <d:message xml:lang="en">There is no table header cell whose <code>id</code>
2183      is <code><var>{value}</var></code> in the same table.</d:message>
2184    </d:item>
2185    
2186    <d:item name="refresh:syntax error"
2187        modules="ContentChecker::HTML">
2188      <d:message xml:lang="en">the specified value is not a valid as part
2189      of a <code>Refresh</code> pragma.</d:message>
2190    </d:item>
2191    
2192    <d:item name="repeat:syntax error"
2193        modules="ContentChecker::HTML">
2194      <d:message xml:lang="en">The attribute value is not an integer or
2195      a string <code>template</code>.</d:message>
2196    </d:item>
2197    
2198    <d:item name="reserved browsing context name"
2199        class="attribute-value-error">
2200      <d:message xml:lang="en">Browsing context name
2201      <code><var>{@}</var></code> is reserved.</d:message>
2202      <d:desc xml:lang="en">
2203        <p>The specified browsing context name is reserved.
2204        The document is non-conforming.</p>
2205    
2206        <p>Names of browsing contexts starting with <code>_</code>
2207        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
2208        are reserved so that it must not be used.</p>
2209    
2210        <p>Old version of HTML, non-HTML markup languages, and
2211        Web browsers define or implements special reserved
2212        browsing context names <code>_blank</code>,
2213        <code>_main</code>, and <code>_replace</code>.
2214        However, they are <em>not</em> conforming attribute values.</p>
2215      </d:desc>
2216    </d:item>
2217    
2218    <d:item name="Reserved Prefixes and Namespace Names:Name"
2219        modules="ContentChecker::XML">
2220      <d:message xml:lang="en">Namespace name <code><var>{text}</var></code>
2221      is reserved and cannot be used for an arbitrary prefix.</d:message>
2222    </d:item>
2223    
2224    <d:item name="Reserved Prefixes and Namespace Names:Prefix"
2225        modules="ContentChecker::XML">
2226      <d:message xml:lang="en">Namespace prefix <code><var>{text}</var></code>
2227      is reserved and cannot be used for an arbitrary namespace name.</d:message>
2228    </d:item>
2229    
2230    <d:item name="link type:proposed"
2231        modules="ContentChecker::HTML">
2232      <d:message xml:lang="en">Link type <code><var>{value}</var></code>
2233      is proposed but not accepted yet; it <em>should not</em> be
2234      used until it has been accepted.</d:message>
2235      <d:desc>
2236        <p>The link type is in the <i>proposed</i> status; it
2237        <em>should not</em> be used until it has been
2238        accepted.</p>
2239    
2240        <p><strong>Warning</strong>: The data served to the
2241        conforming checker might be out of date; it might have already
2242        been accepted or rejected.  The document might or might not be
2243        conforming depending on the status.  See WHATWG Wiki
2244        for the latest information.</p>
2245      </d:desc>
2246    </d:item>
2247    
2248    <d:item name="sizes:syntax error"
2249        modules="ContentChecker::HTML">
2250      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
2251      is not a valid value.</d:message>
2252    </d:item>
2253    
2254    <d:item name="space in ID"
2255        modules="ContentChecker::HTML">
2256      <d:message xml:lang="en">White space characters are not allowed
2257      in the <code>id</code> attribute.</d:message>
2258    </d:item>
2259    
2260    <d:item name="template:not template"
2261        modules="ContentChecker ContentChecker::HTML">
2262      <d:message xml:lang="en">The node referenced by the <code>template</code>
2263      attribute is not a template.</d:message>
2264    </d:item>
2265    
2266    <d:item name="window name:empty"
2267        modules="ContentChecker::HTML">
2268      <d:message xml:lang="en">Browsing context name must not be empty.</d:message>
2269    </d:item>
2270    
2271    <d:item name="window name:reserved"
2272        modules="ContentChecker::HTML">
2273      <d:message xml:lang="en">Browsing context name
2274      <code><var>{value}</var></code> is reserved.</d:message>
2275    </d:item>
2276    
2277    <d:item name="word not allowed"
2278        modules="ContentChecker::HTML">
2279      <d:message xml:lang="en">The word <code><var>{value}</var></code> is not
2280      allowed in this attribute.</d:message>
2281    </d:item>
2282    
2283    <d:item name="XML 1.0 NCName:syntax error"
2284        modules="RDFXML">
2285      <d:message xml:lang="en">The specified value is not a legal XML Namespaces
2286      1.0 <code>NCName</code>.</d:message>
2287  </d:item>  </d:item>
2288    
2289  </section>  </section>
# Line 203  Web Document Conformance Checker (BETA)< Line 2291  Web Document Conformance Checker (BETA)<
2291  <section id="table-model-errors">  <section id="table-model-errors">
2292  <h2>Table Model Errors</h2>  <h2>Table Model Errors</h2>
2293    
2294    <d:item name="cell overlapping"
2295        modules="HTML::Table">
2296      <d:message xml:lang="en">Cell slot (<var>{text}</var>) is filled by
2297      multiple cells.</d:message>
2298    </d:item>
2299    
2300    <d:item name="colspan creates column with no anchored cell"
2301        modules="HTML::Table">
2302      <d:message xml:lang="en">This <code>colspan</code> attribute
2303      results in creating a table column that does not contain
2304      any cell anchored to it.</d:message>
2305    </d:item>
2306    
2307    <d:item name="column with no anchored cell"
2308        modules="HTML::Table">
2309      <d:message xml:lang="en">This column has no anchored cell.</d:message>
2310    </d:item>
2311    
2312  <d:item name="table:no cell in last row"  <d:item name="table:no cell in last row"
2313      class="table-model-error">      class="table-model-error">
2314    <d:message xml:lang="en">The table has no cell (<code>td</code> or    <d:message xml:lang="en">The table has no cell (<code>td</code> or
2315    <code>th</code>) in the last row.</d:message>    <code>th</code>) in the last row.</d:message>
2316  </d:item>  </d:item>
2317    
2318    <d:item name="table:rowspan extends table"
2319        class="table-model-error">
2320      <d:message xml:lang="en">This <code>rowspan</code> attribute
2321      results in creating a table row that does not contain
2322      any cell anchored to it.</d:message>
2323      <d:desc xml:lang="en">
2324        <p>The <code>rowspan</code> attribute value of the cell
2325        is so specified that it extends a table in the row axis.
2326        However, the extended row does not contain any cell by itself.
2327        The document is non-conforming.</p>
2328    
2329        <p>For example, the table below is non-conforming:
2330          <pre class="html bad example"><code>&lt;table>
2331    &lt;tbody>
2332    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
2333    &lt;/tbody>
2334    &lt;/table></code></pre>
2335        ... since the second row contains only
2336        a cell that spans between first and second rows.</p>
2337      </d:desc>
2338    </d:item>
2339    
2340    <d:item name="row with no anchored cell"
2341        modules="HTML::Table">
2342      <d:message xml:lang="en">This row has no anchored cell.</d:message>
2343    </d:item>
2344    
2345    <d:item name="rowspan creates row with no anchored cell"
2346        modules="HTML::Table">
2347      <d:message xml:lang="en">This <code>rowspan</code> attribute
2348      results in creating a table row that does not contain
2349      any cell anchored to it.</d:message>
2350    </d:item>
2351    
2352    
2353  </section>  </section>
2354    
2355  <section id="imt-warnings">  <section id="imt-warnings">
2356  <h2>Internet Media Type Warnings</h2>  <h2>Internet Media Type Errors</h2>
2357    
2358    <d:item name="IMT:composite"
2359        modules="ContentChecker::Atom">
2360      <d:message xml:lang="en">The specified media type is a composite
2361      type, which is not allowed in this context.</d:message>
2362    </d:item>
2363    
2364    <d:item name="IMT:syntax error"
2365        modules="ContentChecker::HTML ContentChecker::Atom">
2366      <d:message xml:lang="en">The specified value is not an Internet Media
2367      Type.</d:message>
2368    </d:item>
2369    
2370  <d:item name="IMT:obsolete subtype"  <d:item name="IMT:obsolete subtype"
2371      class="should" level="s">      class="should" level="s">
2372    <d:message xml:lang="en">An <em>obsolete</em> subtype is used.</d:message>    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
2373      subtype is used.</d:message>
2374      <d:item xml:lang="en">
2375        <p>The specified Internet Media Type is registered with status
2376        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
2377        
2378        <dl class="swtich">
2379        <dt>Media type <code>text/ecmascript</code></dt>
2380          <dd>Media type <code>text/ecmascript</code> is obsoleted in
2381          favor of <code>application/ecmascript</code>.  Note that
2382          <code>text/javascript</code> would be better alternative
2383          for many cases.</dd>
2384        <dt>Media type <code>text/javascript</code></dt>
2385          <dd>Media type <code>text/javascript</code> is obsoleted by
2386          <abbr>IETF</abbr> with backward incompatible alternate
2387          <code>application/javascript</code> for architectural
2388          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
2389        </dl>
2390      </d:item>
2391  </d:item>  </d:item>
2392    
2393  <d:item name="IMT:private subtype"  <d:item name="IMT:private subtype"
2394      class="should" level="s">      class="should" level="s">
2395    <d:message xml:lang="en">A private (<code>x-</code> or <code>x.</code>)    <d:message xml:lang="en"><code><var>{@}</var></code>: A private
2396    subtype is used.</d:message>    (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
2397  </d:item>  </d:item>
2398    
2399  <d:item name="IMT:unregistered subtype"  <d:item name="IMT:unregistered subtype"
2400      class="should" level="s">      class="should" level="s">
2401    <d:message xml:lang="en">The subtype is not registered to IANA.</d:message>    <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
2402      not registered to IANA.</d:message>
2403  <!-- TODO: Unknown message?? -->  <!-- TODO: Unknown message?? -->
2404  </d:item>  </d:item>
2405    
2406    <d:item name="not IMT"
2407        modules="ContentChecker::Atom">
2408      <d:message xml:lang="en">A value that is not an Internet Media Type
2409      is not allowed here.</d:message>
2410    </d:item>
2411    
2412  </section>  </section>
2413    
2414  <section id="uri-errors">  <section id="uri-errors">
2415  <h2>URI (or IRI) Errors</h2>  <h2>URL Errors</h2>
2416    
2417    <d:item name="syntax error:iri3987"
2418        modules="URIChecker CacheManifest">
2419      <d:message xml:lang="en">The specified value is syntactically not an
2420      IRI.</d:message>
2421    </d:item>
2422    
2423    <d:item name="syntax error:iriref3987"
2424        modules="URIChecker">
2425      <d:message xml:lang="en">The specified value is syntactically not an IRI
2426      reference.</d:message>
2427      <d:desc xml:lang="en">
2428        <p>The specified value does not satisfy the syntactical requirements
2429        for IRI references.  The document is non-conforming.</p>
2430    
2431        <p>Possible causes:
2432          <ul>
2433          <li>The string might contain one or more white space characters.
2434          Especially, the <code> </code> (<code>U+0020</code>
2435          <code class="charname">SPACE</code>) character cannot be
2436          used in IRI references.</li>
2437          </ul>
2438        </p>
2439      </d:desc>
2440    </d:item>
2441    
2442    <d:item name="syntax error:rdfuriref"
2443        modules="URIChecker">
2444      <d:message xml:lang="en">The specified value is syntactically not an RDF
2445      URI reference.</d:message>
2446    </d:item>
2447    
2448    <d:item name="syntax error:uri2396"
2449        modules="URIChecker">
2450      <d:message xml:lang="en">The specified value is syntactically not a
2451      URI according to RFC 2396.</d:message>
2452    </d:item>
2453    
2454    <d:item name="syntax error:uri3986"
2455        modules="URIChecker">
2456      <d:message xml:lang="en">The specified value is syntactically not a
2457      URI.</d:message>
2458    </d:item>
2459    
2460  <d:item name="URI::syntax error"  <d:item name="URL:address format"
2461      class="must" level="m">      modules="URIChecker">
2462    <d:message xml:lang="en">This string is not an IRI syntactically.</d:message>    <d:message xml:lang="en">URL host address format
2463      <code><var>{value}</var></code> is not supported by the
2464      conformance checker.</d:message>
2465    </d:item>
2466    
2467    <d:item name="URL:default port"
2468        modules="URIChecker">
2469      <d:message xml:lang="en">Default port number should be omitted.</d:message>
2470    </d:item>
2471    
2472    <d:item name="URL:dot-segment"
2473        modules="URIChecker">
2474      <d:message xml:lang="en">A dot-segment (<code>.</code> or
2475      <code>..</code>) occurs in an absolute reference.</d:message>
2476      <d:desc>
2477        <p>Dot-segment (<code>.</code> or <code>..</code>) should
2478        not occur in an absolute reference.</p>
2479    
2480        <p>In relative references, dot-segments are used to represent
2481        the current (<code>.</code>) or the parent (<code>..</code>)
2482        hierarchy of the path.  Though they are also allowed
2483        in absolute references, it should be resolved to the
2484        canonical form before it has been published.</p>
2485      </d:desc>
2486    </d:item>
2487    
2488    <d:item name="URL:empty host"
2489        modules="URIChecker">
2490      <d:message xml:lang="en">The host component of the URL is empty.</d:message>
2491    </d:item>
2492    
2493    <d:item name="URL:empty path"
2494        modules="URIChecker">
2495      <d:message xml:lang="en">The URL does not end with
2496      a <code>/</code> character.</d:message>
2497      <d:item xml:lang="en">
2498        <p>The IRI does not end with a <code>/</code>.  If there is an
2499        authority component in an IRI, a <code>/</code> should be present
2500        instead of empty path component.</p>
2501    
2502        <p>For example, <code>http://www.example.com<strong>/</strong></code>
2503        is preferred to <code>http://www.example.com</code>.</p>
2504      </d:item>
2505    </d:item>
2506    
2507    <d:item name="URL:empty port"
2508        modules="URIChecker">
2509      <d:message xml:lang="en">The port component of the URL is empty.</d:message>
2510    </d:item>
2511    
2512    <d:item name="URL fragment not allowed"
2513        modules="CacheManifest">
2514      <d:message xml:lang="en">The fragment component of the URL is not
2515      allowed.</d:message>
2516    </d:item>
2517    
2518    <d:item name="URL:long host"
2519        modules="URIChecker">
2520      <d:message xml:lang="en">The host component of the URL
2521      is too long.</d:message>
2522    </d:item>
2523    
2524    <d:item name="URL:lowercase hexadecimal digit"
2525        modules="URIChecker">
2526      <d:message xml:lang="en">A lowercase hexadecimal digit is used
2527      in percent-encoding.</d:message>
2528      <d:desc xml:lang="en">
2529        <p>The hexadecimal digit in percent-encoding string in the IRI
2530        is in lowercase.  Though the IRI <em>is</em> conforming,
2531        it should be in uppercase.</p>
2532      </d:desc>
2533    </d:item>
2534    
2535    <d:item name="URL:non-DNS host"
2536        modules="URIChecker">
2537      <d:message xml:lang="en">The host component of the URL
2538      is not a DNS host name.</d:message>
2539    </d:item>
2540    
2541    <d:item name="URL:non UTF-8 host"
2542        modules="URIChecker">
2543      <d:message xml:lang="en">The host component of the URL
2544      is not encoded in UTF-8.</d:message>
2545    </d:item>
2546    
2547    <d:item name="URL:password"
2548        modules="URIChecker">
2549      <d:message xml:lang="en">Password should not be included in a URL
2550      for the security.</d:message>
2551    </d:item>
2552    
2553    <d:item name="URL:percent-encoded unreserved"
2554        modules="URIChecker">
2555      <d:message xml:lang="en">An unreserved character is
2556      percent-encoded.</d:message>
2557      <d:desc xml:lang="en">
2558        <p>An unreserved character is percent-encoded in the IRI.
2559        Though it <em>is</em> conforming, it should be in the
2560        decoded (or bare) form.</p>
2561      </d:desc>
2562    </d:item>
2563    
2564    <d:item name="URL:uppercase host"
2565        modules="URIChecker">
2566      <d:message xml:lang="en">The host <code><var>{value}</var></code>
2567      should be spelt in lowercase.</d:message>
2568    </d:item>
2569    
2570    <d:item name="URL:uppercase scheme name"
2571        modules="URIChecker">
2572      <d:message xml:lang="en">URL scheme name is in uppercase.</d:message>
2573      <d:desc xml:lang="en">
2574        <p>The scheme part of the IRI is written in uppercase letter.</p>
2575    
2576        <p>Uppercase scheme names are not required to be processed
2577        correctly.</p>
2578    <!-- @@
2579     RFC 3986 3.1.
2580     > Although schemes are case-
2581       insensitive, the canonical form is lowercase and documents that
2582       specify schemes must do so with lowercase letters.
2583    
2584     > An implementation ... should only produce lowercase scheme names for
2585       consistency.
2586    -->
2587      </d:desc>
2588  </d:item>  </d:item>
2589    
2590  </section>  </section>
2591    
2592  <section id="uri-errors">  <section id="mq-errors">
2593  <h2>URI (or IRI) Errors</h2>  <h2>Media Query Errors</h2>
2594    
2595  <d:item name="URI::empty path"  <d:item name="mq syntax error"
2596      class="should" level="s">      modules="CSS::MediaQueryParser">
2597    <d:message xml:lang="en">This IRI should explicitly end with    <d:message xml:lang="en">The specified value has a syntax error as a
2598    <code>/</code>.</d:message>    media query.</d:message>
2599    </d:item>
2600    
2601    <d:item name="unknown media type"
2602        modules="CSS::MediaQueryParser">
2603      <d:message xml:lang="en">Media type <code><var>{value}</var></code> is
2604      not supported by the conformance checker.</d:message>
2605    </d:item>
2606    
2607    </section>
2608    
2609    <section id="selectors-errors">
2610    <h2>Selectors Errors</h2>
2611    
2612    <d:item name="an+b not closed"
2613        modules="CSS::SelectorsParser">
2614      <d:message xml:lang="en">Argument list of the pseudo-class is
2615      not closed by a <code>)</code> character.</d:message>
2616    </d:item>
2617    
2618    <d:item name="ab+b not integer"
2619        modules="CSS::SelectorsParser">
2620      <d:message xml:lang="en">Numbers in the argument
2621      <code><var>a</var>n+<var>b</var></code> have to be integers.</d:message>
2622    </d:item>
2623    
2624    <d:item name="an+b syntax error"
2625        modules="CSS::SelectorsParser">
2626      <d:message xml:lang="en">Argument <code><var>a</var>n+<var>b</var></code> is
2627      syntactically incorrect.</d:message>
2628    </d:item>
2629    
2630    <d:item name="attr selector not closed"
2631        modules="CSS::SelectorsParser">
2632      <d:message xml:lang="en">Attribute selector is not closed by
2633      a <code>]</code> character.</d:message>
2634    </d:item>
2635    
2636    <d:item name="lang selector not closed"
2637        modules="CSS::SelectorsParser">
2638      <d:message xml:lang="en">Argument list of the <code>:lang</code>
2639      selector is not closed by a <code>)</code> character.</d:message>
2640    </d:item>
2641    
2642    <d:item name="namespace prefix:not declared"
2643        modules="CSS::SelectorsParser">
2644      <d:message xml:lang="en">Namespace prefix <code><var>{value}</var></code>
2645      is not declared.</d:message>
2646    </d:item>
2647    
2648    <d:item name="no attr local name"
2649        modules="CSS::SelectorsParser">
2650      <d:message xml:lang="en">Attribute local name is missing.</d:message>
2651    </d:item>
2652    
2653    <d:item name="no attr match"
2654        modules="CSS::SelectorsParser">
2655      <d:message xml:lang="en">Attribute matching operator (e.g.
2656      <code>=</code>) is missing.</d:message>
2657    </d:item>
2658    
2659    <d:item name="no attr name"
2660        modules="CSS::SelectorsParser">
2661      <d:message xml:lang="en">Attribute name is missing.</d:message>
2662    </d:item>
2663    
2664    <d:item name="no attr namespace separator"
2665        modules="CSS::SelectorsParser">
2666      <d:message xml:lang="en">Attribute namespace wildcard <code>*</code>
2667      is not followed by a <code>|</code> character.</d:message>
2668    </d:item>
2669    
2670    <d:item name="no attr value"
2671        modules="CSS::SelectorsParser">
2672      <d:message xml:lang="en">Attribute value is missing.</d:message>
2673    </d:item>
2674    
2675    <d:item name="no class name selector"
2676        modules="CSS::SelectorsParser">
2677      <d:message xml:lang="en">Class name is missing.</d:message>
2678      <!-- "." not followed by a class name -->
2679    </d:item>
2680    
2681    <d:item name="no combinator"
2682        modules="CSS::SelectorsParser">
2683      <d:message xml:lang="en">Combinator is missing.</d:message>
2684    </d:item>
2685    
2686    <d:item name="no contains string"
2687        modules="CSS::SelectorsParser">
2688      <d:message xml:lang="en">No string is specified in the argument
2689      list of the <code>:-manakai-contains</code> pseudo-class
2690      selector.</d:message>
2691    </d:item>
2692    
2693    <d:item name="no lang tag"
2694        modules="CSS::SelectorsParser">
2695      <d:message xml:lang="en">Language tag argument is missing.</d:message>
2696    </d:item>
2697    
2698    <d:item name="no local name selector"
2699        modules="CSS::SelectorsParser">
2700      <d:message xml:lang="en">Local name part of the type selector (or
2701      <code>*</code> for the universal selector) is missing.</d:message>
2702      <!-- "|" not followed by a name or "*" -->
2703    </d:item>
2704    
2705    <d:item name="no pseudo-class name"
2706        modules="CSS::SelectorsParser">
2707      <d:message xml:lang="en">Pseudo-class name is missing.</d:message>
2708    </d:item>
2709    
2710    <d:item name="no pseudo-element name"
2711        modules="CSS::SelectorsParser">
2712      <d:message xml:lang="en">Pseudo-element name is missing.</d:message>
2713    </d:item>
2714    
2715    <d:item name="no sss"
2716        modules="CSS::SelectorsParser">
2717      <d:message xml:lang="en">Sequence of simple selectors is
2718      expected.</d:message>
2719    </d:item>
2720    
2721    <d:item name="not not closed"
2722        modules="CSS::SelectorsParser">
2723      <d:message xml:lang="en">Argument list of the <code>:not</code> selector
2724      is not closed by a <code>)</code> character.</d:message>
2725    </d:item>
2726    
2727    <d:item name="ss after pseudo-element"
2728        modules="CSS::SelectorsParser">
2729      <d:message xml:lang="en">Simple selector is not allowed after a
2730      pseudo element.</d:message>
2731    </d:item>
2732    
2733    <d:item name="unknown pseudo-class"
2734        modules="CSS::SelectorsParser">
2735      <d:message xml:lang="en">Pseudo-class <code>:<var>{value}</var></code>
2736      is not supported by the conformance checker.</d:message>
2737    </d:item>
2738    
2739    <d:item name="unknown pseudo-element"
2740        modules="CSS::SelectorsParser">
2741      <d:message xml:lang="en">Pseudo-element <code>::<var>{value}</var></code>
2742      is not supported by the conformance checker.</d:message>
2743    </d:item>
2744    
2745    </section>
2746    
2747    <section id="css-errors">
2748    <h2>CSS Errors</h2>
2749    
2750    <d:item name="at-rule not allowed"
2751        modules="CSS::Parser">
2752      <d:message xml:lang="en">An <code>@<var>{text}</var></code> rule is not
2753      allowed here.</d:message>
2754    </d:item>
2755    
2756    <d:item name="at-rule syntax error"
2757        modules="CSS::Parser">
2758      <d:message xml:lang="en">The <code>@<var>{text}</var></code> rule is
2759      syntactically incorrect.</d:message>
2760    </d:item>
2761    
2762    <d:item name="block not closed"
2763        modules="CSS::Parser">
2764      <d:message xml:lang="en">Block is not closed before the end of
2765      file.</d:message>
2766    </d:item>
2767    
2768    <d:item name="CSS duplication"
2769        modules="CSS::Parser">
2770      <d:message xml:lang="en">Component <code>&lt;<var>{text}</var>></code> is
2771      already specified.</d:message>
2772    </d:item>
2773    
2774    <d:item name="CSS syntax error"
2775        modules="CSS::Parser">
2776      <d:message xml:lang="en">Specified value is syntactically not a correct
2777      <code>&lt;<var>{text}</var>></code>.</d:message>
2778    </d:item>
2779    
2780    <d:item name="no declaration block"
2781        modules="CSS::Parser">
2782      <d:message xml:lang="en">No declaration block is found after a group of
2783      selectors.</d:message>
2784    </d:item>
2785    
2786    <d:item name="no property colon"
2787        modules="CSS::Parser">
2788      <d:message xml:lang="en">A <code>:</code> character is missing after
2789      a property name.</d:message>
2790    </d:item>
2791    
2792    <d:item name="no property name"
2793       modules="CSS::Parser">
2794      <d:message xml:lang="en">Property name is expected.</d:message>
2795    </d:item>
2796    
2797    <d:item name="no property semicolon"
2798       modules="CSS::Parser">
2799      <d:message xml:lang="en">A <code>;</code> character is missing at the
2800      end of the property.</d:message>
2801    </d:item>
2802    
2803    <d:item name="priority syntax error"
2804        modules="CSS::Parser">
2805      <d:message xml:lang="en">Priority part of the declaration is syntactically
2806      incorrect.</d:message>
2807    </d:item>
2808    
2809    <d:item name="unknown at-rule"
2810        modules="CSS::Parser">
2811      <d:message xml:lang="en">The <code>@<var>{value}</var></code> rule is
2812      not supported by the conformance checker.</d:message>
2813    </d:item>
2814    
2815    <d:item name="unknown property"
2816        modules="CSS::Parser">
2817      <d:message xml:lang="en">Property <code><var>{value}</var></code> is
2818      not supported by the conformance checker.</d:message>
2819    </d:item>
2820    
2821    </section>
2822    
2823    <section id="cache-manifest-errors">
2824    <h2>Cache Manifest Errors</h2>
2825    
2826    <d:item name="both in entries and whitelist"
2827        modules="CacheManifest">
2828      <d:message xml:lang="en">This URL is found both in the explicit or
2829      fallback entries and in the online whitelist.</d:message>
2830    </d:item>
2831    
2832    <d:item name="different origin from manifest"
2833        modules="CacheManifest">
2834      <d:message xml:lang="en">The specified URL has different origin from
2835      the manifest.</d:message>
2836    </d:item>
2837    
2838    <d:item name="different scheme from manifest"
2839        modules="CacheManifest">
2840      <d:message xml:lang="en">The scheme component of the URL is
2841      different from that of the manifest URL.  The URL is ignored.</d:message>
2842    </d:item>
2843    
2844    <d:item name="duplicate oc namespace"
2845        modules="CacheManifest">
2846      <d:message xml:lang="en">This oppotunistic caching namespace is already
2847      specified.</d:message>
2848    </d:item>
2849    
2850    <d:item name="no fallback entry URL"
2851        modules="CacheManifest">
2852      <d:message xml:lang="en">Fallback entry URL is missing.</d:message>
2853    </d:item>
2854    
2855    <d:item name="not manifest"
2856        modules="CacheManifest">
2857      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
2858      <d:desc xml:lang="en">
2859        <p>The specified document is <em>not</em> a cache manifest.
2860        The document is non-conforming.</p>
2861    
2862        <p>An entity labeled as Internet media type
2863        <code>text/cache-manifest</code> must contain a cache manifest.</p>
2864    
2865        <p>A cache manifest must start with a line whose content is
2866        <code class="manifest example">CACHE MANIFEST</code>
2867        (exactly one space character between
2868        <code>CACHE</code> and <code>MANIFEST</code>).</p>
2869      </d:desc>
2870    </d:item>
2871    
2872    <d:item name="same as manifest URL"
2873        modules="CacheManifest">
2874      <d:message xml:lang="en">This URL is same as the manifest URL.</d:message>
2875    </d:item>
2876    
2877    </section>
2878    
2879    <section id="information">
2880    <h2>Stability Information</h2>
2881    
2882    <d:item name="deprecated:attr"
2883        modules="ContentChecker">
2884      <d:message xml:lang="en">This attribute is deprecated.</d:message>
2885    </d:item>
2886    
2887    <d:item name="deprecated:element"
2888        modules="ContentChecker">
2889      <d:message xml:lang="en">This element is deprecated.</d:message>
2890    </d:item>
2891    
2892    <d:item name="status:cr:element"
2893        modules="ContentChecker">
2894      <d:message xml:lang="en">This element is in the
2895      <strong>call for implementation</strong> stage.</d:message>
2896      <d:desc xml:lang="en">
2897        <p>The element is in the call for implementation stage.</p>
2898        
2899        <p>Usually, using the element is safe.  However, it is a new feature
2900        so that it might not be implemented correctly.  If it is found that
2901        the feature is hard or impossible to implement, the feature
2902        might be revised, or in some case it might be dropped.</p>
2903    
2904        <p>Elements defined by Atom 1.0 (IETF Proposed Standard), and XBL 2.0
2905        (W3C Candidate Recommendation) belong to this class.</p>
2906      </d:desc>
2907    </d:item>
2908    
2909    <d:item name="status:lc:element"
2910        modules="ContentChecker">
2911      <d:message xml:lang="en">This element is in the <strong>last
2912      call for comments</strong> stage.</d:message>
2913      <d:desc xml:lang="en">
2914        <p>The element is in the last call for comments stage.</p>
2915        
2916        <p>The element is relatively mature, though the standardization
2917        is not done yet.  It may be used for experiments.  Since it is a new
2918        feature, it might not be implemented correctly or at all.  If it is
2919        found that the feature is hard or impossible to implement, the feature
2920        might be revised or might be dropped.</p>
2921    
2922        <p>Elements defined by Web Forms 2.0 as well as some elements
2923        defined by HTML5 belong to this class.</p>
2924      </d:desc>
2925    </d:item>
2926    
2927    <d:item name="status:wd:element"
2928        modules="ContentChecker">
2929      <d:message xml:lang="en">This element is documented in a <strong>working
2930      draft</strong>.</d:message>
2931      <d:desc xml:lang="en">
2932        <p>The element is documented in a working or editor's draft
2933        and not yet completed.</p>
2934        
2935        <p>The element should not be used for any practical purpose.
2936        The feature might be drastically changed later or might be
2937        entirely removed.</p>
2938    
2939        <p>Most of new elements defined by HTML5 belong to this class.</p>
2940      </d:desc>
2941    </d:item>
2942    
2943    <d:item name="status:non-standard:element"
2944        modules="ContentChecker">
2945      <d:message xml:lang="en">This element is <strong>not part of any
2946      standard</strong> the conformance checker knows.</d:message>
2947      <d:desc xml:lang="en">
2948        <p>The element is not part of any standard or draft the conformance
2949        checker is aware of.</p>
2950        
2951        <p>The element should not be used for any practical purpose unless
2952        there is really a standard that defines the element.</p>
2953      </d:desc>
2954    </d:item>
2955    
2956    <d:item name="status:cr:attr"
2957        modules="ContentChecker">
2958      <d:message xml:lang="en">This attribute is in the
2959      <strong>call for implementation</strong> stage.</d:message>
2960      <d:desc xml:lang="en">
2961        <p>The attribute is in the call for implementation stage.</p>
2962        
2963        <p>Usually, using the attribute is safe.  However, it is a new feature
2964        so that it might not be implemented correctly.  If it is found that
2965        the feature is hard or impossible to implement, the feature
2966        might be revised, or in some case it might be dropped.</p>
2967      </d:desc>
2968    </d:item>
2969    
2970    <d:item name="status:lc:attr"
2971        modules="ContentChecker">
2972      <d:message xml:lang="en">This attribute is in the <strong>last
2973      call for comments</strong> stage.</d:message>
2974      <d:desc xml:lang="en">
2975        <p>The attribute is in the last call for comments stage.</p>
2976        
2977        <p>The attribute is relatively mature, though the standardization
2978        is not done yet.  It may be used for experiments.  Since it is a new
2979        feature, it might not be implemented correctly or at all.  If it is
2980        found that the feature is hard or impossible to implement, the feature
2981        might be revised or might be dropped.</p>
2982      </d:desc>
2983    </d:item>
2984    
2985    <d:item name="status:wd:attr"
2986        modules="ContentChecker">
2987      <d:message xml:lang="en">This attribute is documented in a <strong>working
2988      draft</strong>.</d:message>
2989      <d:desc xml:lang="en">
2990        <p>The attribute is documented in a working or editor's draft
2991        and not yet completed.</p>
2992        
2993        <p>The attribute should not be used for any practical purpose.
2994        The feature might be drastically changed later or might be
2995        entirely removed.</p>
2996      </d:desc>
2997    </d:item>
2998    
2999    <d:item name="status:non-standard:attr"
3000        modules="ContentChecker">
3001      <d:message xml:lang="en">This attribute is <strong>not part of any
3002      standard</strong> the conformance checker knows.</d:message>
3003      <d:desc xml:lang="en">
3004        <p>The attribute is not part of any standard or draft the conformance
3005        checker is aware of.</p>
3006        
3007        <p>The attribute should not be used for any practical purpose unless
3008        there is really a standard that defines the attribute.</p>
3009      </d:desc>
3010    </d:item>
3011    </section>
3012    
3013    <section id="langtag-errors">
3014    <h2>Language Tag Errors</h2>
3015    
3016    <d:item name="langtag:extension:duplication"
3017        modules="LangTag">
3018      <d:message xml:lang="en">There is another extension subtag
3019      <code><var>{value}</var></code>.</d:message>
3020    </d:item>
3021    
3022    <d:item name="langtag:illegal"
3023        modules="LangTag">
3024      <d:message xml:lang="en">Subtag <code><var>{value}</var></code> is
3025      syntactically invalid.</d:message>
3026    </d:item>
3027    
3028    <d:item name="langtag:language:case"
3029        modules="LangTag">
3030      <d:message xml:lang="en">It is a good practice to represent ISO 639-1
3031      language code <code><var>{value}</var></code> in lowercase.</d:message>
3032    </d:item>
3033    
3034    <d:item name="langtag:language:mul"
3035        modules="LangTag">
3036      <d:message xml:lang="en">Langauge tag <code>mul</code> should not be
3037      used.</d:message>
3038    </d:item>
3039    
3040    <d:item name="langtag:language:nosemantics"
3041        modules="LangTag">
3042      <d:message xml:lang="en">No semantics is defined for language subtag
3043      <code><var>{value}</var></code>.</d:message>
3044    </d:item>
3045    
3046    <d:item name="langtag:language:syntax"
3047        modules="LangTag">
3048      <d:message xml:lang="en">The language subtag <code><var>{value}</var></code>
3049      is syntactically invalid.</d:message>
3050    </d:item>
3051    
3052    <d:item name="langtag:language:und"
3053        modules="LangTag">
3054      <d:message xml:lang="en">Langauge tag <code>und</code> should not be
3055      used.</d:message>
3056    </d:item>
3057    
3058    <d:item name="langtag:private"
3059        modules="LangTag">
3060      <d:message xml:lang="en">It would be better if a private use language
3061      tag (<code><var>{value}</var></code>) is not used.</d:message>
3062    </d:item>
3063    
3064    <d:item name="langtag:privateuse:syntax"
3065        modules="LangTag">
3066      <d:message xml:lang="en">Private use subtag <code><var>{value}</var></code>
3067      is syntactically invalid.</d:message>
3068    </d:item>
3069    
3070    <d:item name="langtag:region:case"
3071        modules="LangTag">
3072      <d:message xml:lang="en">It is a good practice to represent ISO 3166
3073      country code <code><var>{value}</var></code> in uppercase.</d:message>
3074    </d:item>
3075    
3076    <d:item name="langtag:region:nosemantics"
3077        modules="LangTag">
3078      <d:message xml:lang="en">No semantics is defined for region subtag
3079      <code><var>{value}</var></code>.</d:message>
3080    </d:item>
3081    
3082    <d:item name="langtag:region:private"
3083        modules="LangTag">
3084      <d:message xml:lang="en">Use of private use country code
3085      <code><var>{value}</var></code> is not allowed.</d:message>
3086    </d:item>
3087    
3088    </section>
3089    
3090    <section id="rdfxml-errors">
3091    <h2>RDF/XML Errors</h2>
3092    
3093    <d:item name="bad rdf namespace"
3094        modules="RDFXML">
3095      <d:message xml:lang="en">The namespace URI of an element that
3096      represents an RDF concept must be
3097      <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#</code>.</d:message>
3098    </d:item>
3099    
3100    <d:item name="duplicate rdf id"
3101        modules="RDFXML">
3102      <d:message xml:lang="en">The specified value is already used as an
3103      ID.</d:message>
3104    </d:item>
3105    
3106    <d:item name="duplicate unqualified attr"
3107        modules="RDFXML">
3108      <d:message xml:lang="en">Both unqualified attribute and namespace‐qualified
3109      RDF attribute are specified, which is not allowed.</d:message>
3110    </d:item>
3111    
3112    <d:item name="parse type other"
3113        modules="RDFXML">
3114      <d:message xml:lang="en">An invalid value is specified to
3115      the <code>parseType</code> attribute.</d:message>
3116    </d:item>
3117    
3118    <d:item name="second node element"
3119        modules="RDFXML">
3120      <d:message xml:lang="en">There is another element, such that
3121      this element is not allowed.</d:message>
3122    </d:item>
3123    
3124    <d:item name="unqualified attr"
3125        modules="RDFXML">
3126      <d:message xml:lang="en">Unqualified attribute is not allowed.</d:message>
3127    </d:item>
3128    
3129    <d:item name="unqualified rdf attr"
3130        modules="RDFXML">
3131      <d:message xml:lang="en">RDF attribute should be
3132      namespace‐qualified.</d:message>
3133  </d:item>  </d:item>
3134    
3135  </section>  </section>
# Line 257  Web Document Conformance Checker (BETA)< Line 3137  Web Document Conformance Checker (BETA)<
3137  <section id="unsupported-messages">  <section id="unsupported-messages">
3138  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
3139    
3140  <d:item name="attribute"  <d:item name="unknown element"
3141      class="unsupported" level="unsupported">      modules="ContentChecker">
3142    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
3143    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> is not supported; <em>it might or
3144      might not be conforming</em>.</d:message>
3145    <d:desc xml:lang="en">    <d:desc xml:lang="en">
3146      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
3147      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
3148    </d:desc>    </d:desc>
3149  </d:item>  </d:item>
3150    
3151  <d:item name="element"  <d:item name="unknown attribute"
3152      class="unsupported" level="unsupported">      modules="ContentChecker ContentChecker::HTML ContentChecker::Atom">
3153    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
3154    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
3155      <code><var>{element-local-name}</var></code> is not supported;
3156      <em>it might or might not be conforming</em>.</d:message>
3157    <d:desc xml:lang="en">    <d:desc xml:lang="en">
3158      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
3159      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
3160    </d:desc>    </d:desc>
3161  </d:item>  </d:item>
3162    
3163  <d:item name="link type"  <d:item name="unknown link type"
3164      class="unsupported" level="unsupported">      modules="ContentChecker::HTML">
3165    <d:message xml:lang="en">The link type <code>$0</code> is not standardized    <d:message xml:lang="en">Link type <code><var>{value}</var></code> is not
3166    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
3167    <em>it is non-conforming unless it has now been registered</em>.</d:message>    checker; <em>it is non-conforming unless it now has been
3168      registered</em>.</d:message>
3169    <d:desc xml:lang="en">    <d:desc xml:lang="en">
3170      <p>The <code>rel</code> attribute is defined as a list of link types.      <p>The <code>rel</code> attribute is defined as a list of link types.
3171      Some common link types are defined in the HTML5 specification.      Some common link types are defined in the HTML5 specification.
# Line 293  Web Document Conformance Checker (BETA)< Line 3177  Web Document Conformance Checker (BETA)<
3177      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
3178      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
3179      document is non-conforming.</p>      document is non-conforming.</p>
3180    
3181        <dl>
3182        <dt>Link types <code>shortcut icon</code></dt>
3183            <dd>Link type <code>shortcut</code> is not registered.
3184            Use only <code>icon</code> for linking to so-called favicon.</dd>
3185        </dl>
3186    </d:desc>    </d:desc>
3187  </d:item>  </d:item>
3188    
3189    <d:item name="event handler"
3190        modules="ContentChecker::HTML">
3191      <d:message xml:lang="en">Conformance checking for event handler attribute
3192      is not supported; <em>it might or might not be conforming.</em></d:message>
3193    </d:item>
3194    
3195    <d:item name="media query"
3196        modules="ContentChecker::HTML">
3197      <d:message xml:lang="en">Conformance checking for media query
3198      is not supported; <em>it might or might not be conforming.</em></d:message>
3199    </d:item>
3200    
3201    <d:item name="addr-spec not supported"
3202        modules="ContentChecker::Atom">
3203      <d:message xml:lang="en">Conformance checking for an <code>addr-spec</code>
3204      is not supported; <em>it might or might not be conforming.</em></d:message>
3205    </d:item>
3206    
3207    <d:item name="XML script lang"
3208        modules="ContentChecker::HTML">
3209      <d:message xml:lang="en">Conformance checking for script
3210      language <code><var>{text}</var></code> is not supported;
3211      <em>it might or might not be conforming.</em></d:message>
3212    </d:item>
3213    
3214    <d:item name="XML style lang"
3215        modules="ContentChecker::HTML">
3216      <d:message xml:lang="en">Conformance checking for style
3217      language <code><var>{text}</var></code> is not supported;
3218      <em>it might or might not be conforming.</em></d:message>
3219    </d:item>
3220    
3221    <d:item name="atom|content not supported"
3222        modules="ContentChecker::Atom">
3223      <d:message xml:lang="en">Conformance checking for an Atom
3224      <code>content</code> element with <code>type</code>
3225      <code><var>{text}</var></code> is not supported.</d:message>
3226    </d:item>
3227    
3228  </section>  </section>
3229    
3230  <d:catalog>  <d:cat name="WebHACC:Title">
3231  manakaiCompatMode:quirks;;Quirks Mode    <d:text xml:lang="en">WebHACC (β)</d:text>
3232  manakaiCompatMode:limited quirks;;Limited Quirks Mode  </d:cat>
3233  manakaiCompatMode:no quirks;;No Quirks Mode  
3234    <d:cat name="WebHACC:Heading">
3235  manakaiIsHTML:1;;HTML Document    <d:text xml:lang="en">
3236  manakaiIsHTML:0;;XML Document      <a href="../cc-about"><abbr title="Web Hypertext Application Conformance Checker (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
3237  </d:catalog>    </d:text>
3238      <d:text xml:lang="ja">
3239        <a href="../cc-about"><abbr title="Web ハイパーテキスト応用適合性検査器 (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
3240      </d:text>
3241    </d:cat>
3242    
3243    <d:cat name="Input">
3244      <d:text xml:lang="en">Input</d:text>
3245      <d:text xml:lang="ja">入力</d:text>
3246    </d:cat>
3247    
3248    <d:cat name="By URL">
3249      <d:text xml:lang="en">By URL</d:text>
3250      <d:text xml:lang="ja">URL で指定</d:text>
3251    </d:cat>
3252    
3253    <d:cat name="By direct input">
3254      <d:text xml:lang="en">By direct input</d:text>
3255      <d:text xml:lang="ja">直接入力</d:text>
3256    </d:cat>
3257    
3258    <d:cat name="Options">
3259      <d:text xml:lang="en">More options</d:text>
3260      <d:text xml:lang="ja">検査オプション</d:text>
3261    </d:cat>
3262    
3263    <d:cat name="Check error page">
3264      <d:text xml:lang="en">Check an error page</d:text>
3265      <d:text xml:lang="ja">誤り頁を検査する</d:text>
3266    </d:cat>
3267    
3268    <d:cat name="Content type">
3269      <d:text xml:lang="en">Content type</d:text>
3270      <d:text xml:lang="ja">内容型</d:text>
3271    </d:cat>
3272    
3273    <d:cat name="Charset">
3274      <d:text xml:lang="en">Character encoding</d:text>
3275      <d:text xml:lang="ja">文字符号化</d:text>
3276    </d:cat>
3277    
3278    <d:cat name="As specified">
3279      <d:text xml:lang="en">As specified</d:text>
3280      <d:text xml:lang="ja">指定通り</d:text>
3281    </d:cat>
3282    
3283    <d:cat name="Japanese charsets">
3284      <d:text xml:lang="en">Japanese character encodings</d:text>
3285      <d:text xml:lang="ja">日本語用文字符号化</d:text>
3286    </d:cat>
3287    
3288    <d:cat name="European charsets">
3289      <d:text xml:lang="en">European character encodings</d:text>
3290      <d:text xml:lang="ja">欧米言語用文字符号化</d:text>
3291    </d:cat>
3292    
3293    <d:cat name="Asian charsets">
3294      <d:text xml:lang="en">Asian character encodings</d:text>
3295      <d:text xml:lang="ja">アジア諸語用文字符号化</d:text>
3296    </d:cat>
3297    
3298    <d:cat name="Unicode charsets">
3299      <d:text xml:lang="en">Unicode character encodings</d:text>
3300      <d:text xml:lang="ja">Unicode 系文字符号化</d:text>
3301    </d:cat>
3302    
3303    <d:cat name="Document source to check">
3304      <d:text xml:lang="en">Document source to check</d:text>
3305      <d:text xml:lang="ja">検査する文書のソース</d:text>
3306    </d:cat>
3307    
3308    <d:cat name="Check">
3309      <d:text xml:lang="en">Check</d:text>
3310      <d:text xml:lang="ja">検査</d:text>
3311    </d:cat>
3312    
3313    <d:cat name="Setting innerHTML">
3314      <d:text xml:lang="en">Setting <code>innerHTML</code> of HTML element</d:text>
3315      <d:text xml:lang="ja"><code>innerHTML</code> に値を設定する HTML 要素</d:text>
3316    </d:cat>
3317    
3318    <d:cat name="Information">
3319      <d:text xml:lang="en">Information</d:text>
3320      <d:text xml:lang="ja">情報</d:text>
3321    </d:cat>
3322    
3323    <d:cat name="HTTP Header">
3324      <d:text xml:lang="en"><abbr title="Hypertext Transfer Protocol">HTTP</abbr>
3325          Header</d:text>
3326      <d:text xml:lang="ja"><abbr lang="en" title="Hypertext Transfer Protocol">HTTP</abbr>
3327          頭部</d:text>
3328    </d:cat>
3329    
3330    <d:cat name="Parse Errors Section">
3331      <d:text xml:lang="en">Parse Errors</d:text>
3332      <d:text xml:lang="ja">構文誤り</d:text>
3333    </d:cat>
3334    
3335    <d:cat name="Parse Errors">
3336      <d:text xml:lang="en">Parse Errors</d:text>
3337      <d:text xml:lang="ja">構文誤り</d:text>
3338    </d:cat>
3339    
3340    <d:cat name="Document Source">
3341      <d:text xml:lang="en">Document Source</d:text>
3342      <d:text xml:lang="ja">文書のソース</d:text>
3343    </d:cat>
3344    
3345    <d:cat name="Source">
3346      <d:text xml:lang="en">Source</d:text>
3347      <d:text xml:lang="ja">ソース</d:text>
3348    </d:cat>
3349    
3350    <d:cat name="Tables Section">
3351      <d:text xml:lang="en">Structure of Tables</d:text>
3352      <d:text xml:lang="ja">表の構造</d:text>
3353    </d:cat>
3354    
3355    <d:cat name="Tables">
3356      <d:text xml:lang="en">Tables</d:text>
3357      <d:text xml:lang="ja">表</d:text>
3358    </d:cat>
3359    
3360    <d:cat name="Document Tree">
3361      <d:text xml:lang="en">Document Tree</d:text>
3362      <d:text xml:lang="ja">文書木</d:text>
3363    </d:cat>
3364    
3365    <d:cat name="Tree">
3366      <d:text xml:lang="en">Tree</d:text>
3367      <d:text xml:lang="ja">木</d:text>
3368    </d:cat>
3369    
3370    <d:cat name="Document">
3371      <d:text xml:lang="en">Document</d:text>
3372      <d:text xml:lang="ja">文書</d:text>
3373    </d:cat>
3374    
3375    <d:cat name="Document Structure">
3376      <d:text xml:lang="en">Document Structure</d:text>
3377      <d:text xml:lang="ja">文書構造</d:text>
3378    </d:cat>
3379    
3380    <d:cat name="Structure">
3381      <d:text xml:lang="en">Structure</d:text>
3382      <d:text xml:lang="ja">構造</d:text>
3383    </d:cat>
3384    
3385    <d:cat name="Reformatted Document Source">
3386      <d:text xml:lang="en">Reformatted Document Source</d:text>
3387      <d:text xml:lang="ja">再整形した文書のソース</d:text>
3388    </d:cat>
3389    
3390    <d:cat name="Reformatted">
3391      <d:text xml:lang="en">Reformatted</d:text>
3392      <d:text xml:lang="ja">再整形</d:text>
3393    </d:cat>
3394    
3395    <d:cat name="RDF Triples">
3396      <d:text xml:lang="en"><abbr>RDF</abbr> Triples</d:text>
3397      <d:text xml:lang="ja"><abbr lang="en">RDF</abbr> 三項組</d:text>
3398    </d:cat>
3399    
3400    <d:cat name="RDF">
3401      <d:text xml:lang="en"><abbr>RDF</abbr></d:text>
3402      <d:text xml:lang="ja"><abbr lang="en">RDF</abbr></d:text>
3403    </d:cat>
3404    
3405    <d:cat name="Structural Errors">
3406      <d:text xml:lang="en">Structural Errors</d:text>
3407      <d:text xml:lang="ja">構造的誤り</d:text>
3408    </d:cat>
3409    
3410    <d:cat name="Struct. Errors">
3411      <d:text xml:lang="en">Struct. Errors</d:text>
3412      <d:text xml:lang="ja">構造誤り</d:text>
3413    </d:cat>
3414    
3415    <d:cat name="Transfer Errors">
3416      <d:text xml:lang="en">Transfer Errors</d:text>
3417      <d:text xml:lang="ja">転送誤り</d:text>
3418    </d:cat>
3419    
3420    <d:cat name="Trans. Errors">
3421      <d:text xml:lang="en">Trans. Errors</d:text>
3422      <d:text xml:lang="ja">転送誤り</d:text>
3423    </d:cat>
3424    
3425    <d:cat name="Result">
3426      <d:text xml:lang="en">Result</d:text>
3427      <d:text xml:lang="ja">結果</d:text>
3428    </d:cat>
3429    
3430    <d:cat name="manakaiCompatMode:quirks">
3431      <d:text xml:lang="en">Quirks Mode</d:text>
3432      <d:text xml:lang="ja">奇癖モード</d:text>
3433    </d:cat>
3434    
3435    <d:cat name="manakaiCompatMode:limited quirks">
3436      <d:text xml:lang="en">Limited Quirks Mode</d:text>
3437      <d:text xml:lang="ja">限定奇癖モード</d:text>
3438    </d:cat>
3439    
3440    <d:cat name="manakaiCompatMode:no quirks">
3441      <d:text xml:lang="en">No Quirks Mode</d:text>
3442      <d:text xml:lang="ja">無奇癖モード</d:text>
3443    </d:cat>
3444    
3445    <d:cat name="manakaiIsHTML:1">
3446      <d:text xml:lang="en">HTML Document</d:text>
3447      <d:text xml:lang="ja">HTML 文書</d:text>
3448    </d:cat>
3449    
3450    <d:cat name="manakaiIsHTML:0">
3451      <d:text xml:lang="en">XML Document</d:text>
3452      <d:text xml:lang="ja">XML 文書</d:text>
3453    </d:cat>
3454    
3455    <d:cat name="manakaiCharset">
3456      <d:text xml:lang="en"><code>charset</code> parameter</d:text>
3457      <d:text xml:lang="ja"><code lang="en">charset</code> 引数</d:text>
3458    </d:cat>
3459    
3460    <d:cat name="inputEncoding">
3461      <d:text xml:lang="en">Input character encoding</d:text>
3462      <d:text xml:lang="ja">入力に用いた文字符号化</d:text>
3463    </d:cat>
3464    
3465    <d:cat name="xmlVersion">
3466      <d:text xml:lang="en">XML <code>version</code></d:text>
3467      <d:text xml:lang="ja">XML <code lang="en">version</code></d:text>
3468    </d:cat>
3469    
3470    <d:cat name="xmlEncoding">
3471      <d:text xml:lang="en">XML <code>encoding</code></d:text>
3472      <d:text xml:lang="ja">XML <code lang="en">encoding</code></d:text>
3473    </d:cat>
3474    
3475    <d:cat name="xmlStandalone">
3476      <d:text xml:lang="en">XML <code>standalone</code></d:text>
3477      <d:text xml:lang="ja">XML <code lang="en">standalone</code></d:text>
3478    </d:cat>
3479    
3480    <d:cat name="... with BOM">
3481      <d:text xml:lang="en"> (with <code class="charname"><abbr title="BYTE ORDER MARK">BOM</abbr></code>)</d:text>
3482      <d:text xml:lang="ja"> (<code class="charname" lang="en"><abbr title="BYTE ORDER MARK">BOM</abbr></code> つき)</d:text>
3483    </d:cat>
3484    
3485    <d:cat name="URL">
3486      <d:text xml:lang="en"><abbr title="Uniform Resource Locator">URL</abbr></d:text>
3487      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
3488    </d:cat>
3489    
3490    <d:cat name="URLs">
3491      <d:text xml:lang="en"><abbr title="Uniform Resource Locators">URLs</abbr></d:text>
3492      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
3493    </d:cat>
3494    
3495    <d:cat name="Container Node">
3496      <d:text xml:lang="en">Container Node</d:text>
3497      <d:text xml:lang="ja">この文書を含む節点</d:text>
3498    </d:cat>
3499    
3500    <d:cat name="Table Element">
3501      <d:text xml:lang="en">Table Element</d:text>
3502      <d:text xml:lang="ja">表要素</d:text>
3503    </d:cat>
3504    
3505    <d:cat name="Base URL">
3506      <d:text xml:lang="en">Base URL</d:text>
3507      <d:text xml:lang="ja">基底 URL</d:text>
3508    </d:cat>
3509    
3510    <d:cat name="Internet Media Type">
3511      <d:text xml:lang="en">Internet Media Type</d:text>
3512      <d:text xml:lang="ja">インターネット媒体型</d:text>
3513    </d:cat>
3514    
3515    <d:cat name="Character Encoding">
3516      <d:text xml:lang="en">Character Encoding</d:text>
3517      <d:text xml:lang="ja">文字符号化</d:text>
3518    </d:cat>
3519    
3520    <d:cat name="Byte Length">
3521      <d:text xml:lang="en">Byte Length</d:text>
3522      <d:text xml:lang="ja">バイト長</d:text>
3523    </d:cat>
3524    
3525    <d:cat name="Character Length">
3526      <d:text xml:lang="en">Character Length</d:text>
3527      <d:text xml:lang="ja">文字長</d:text>
3528    </d:cat>
3529    
3530    <d:cat name="... overridden">
3531      <d:text xml:lang="en"> (<i>overridden</i>)</d:text>
3532      <d:text xml:lang="ja"> (<i>上書き</i>)</d:text>
3533    </d:cat>
3534    
3535    <d:cat name="... overridden, official type is #">
3536      <d:text xml:lang="en"> (<i>overridden</i>; official type is
3537          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
3538      <d:text xml:lang="ja"> (<i>上書き</i>, 公式型は
3539          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
3540    </d:cat>
3541    
3542    <d:cat name="... sniffed">
3543      <d:text xml:lang="en"> (<i>sniffed</i>)</d:text>
3544      <d:text xml:lang="ja"> (<i>探知結果</i>)</d:text>
3545    </d:cat>
3546    
3547    <d:cat name="byte">
3548      <d:text xml:lang="en">byte</d:text>
3549      <d:text xml:lang="ja">バイト</d:text>
3550    </d:cat>
3551    
3552    <d:cat name="bytes">
3553      <d:text xml:lang="en">bytes</d:text>
3554      <d:text xml:lang="ja">バイト</d:text>
3555    </d:cat>
3556    
3557    <d:cat name="Explicit entries">
3558      <d:text xml:lang="en">Explicit entries</d:text>
3559      <d:text xml:lang="ja">明示的項目</d:text>
3560    </d:cat>
3561    
3562    <d:cat name="Fallback entries">
3563      <d:text xml:lang="en">Fallback entries</d:text>
3564      <d:text xml:lang="ja">滑り止め項目</d:text>
3565    </d:cat>
3566    
3567    <d:cat name="Opportunistic caching namespace">
3568      <d:text xml:lang="en">Opportunistic caching namespace</d:text>
3569      <d:text xml:lang="ja">日和見的キャッシュ化名前空間</d:text>
3570    </d:cat>
3571    
3572    <d:cat name="Fallback entry">
3573      <d:text xml:lang="en">Fallback entry</d:text>
3574      <d:text xml:lang="ja">滑り止め項目</d:text>
3575    </d:cat>
3576    
3577    <d:cat name="Online whitelist">
3578      <d:text xml:lang="en">Online whitelist</d:text>
3579      <d:text xml:lang="ja">オンライン・ホワイトリスト</d:text>
3580    </d:cat>
3581    
3582    <d:cat name="No entry">
3583      <d:text xml:lang="en">No entry</d:text>
3584      <d:text xml:lang="ja">項目なし</d:text>
3585    </d:cat>
3586    
3587    <d:cat name="Subject">
3588      <d:text xml:lang="en">Subject</d:text>
3589      <d:text xml:lang="ja">主語</d:text>
3590    </d:cat>
3591    
3592    <d:cat name="Predicate">
3593      <d:text xml:lang="en">Predicate</d:text>
3594      <d:text xml:lang="ja">述語</d:text>
3595    </d:cat>
3596    
3597    <d:cat name="Object">
3598      <d:text xml:lang="en">Object</d:text>
3599      <d:text xml:lang="ja">目的語</d:text>
3600    </d:cat>
3601    
3602    <d:cat name="character">
3603      <d:text xml:lang="en">character</d:text>
3604      <d:text xml:lang="ja">文字</d:text>
3605    </d:cat>
3606    
3607    <d:cat name="characters">
3608      <d:text xml:lang="en">characters</d:text>
3609      <d:text xml:lang="ja">文字</d:text>
3610    </d:cat>
3611    
3612    <d:cat name="Line #">
3613      <d:text xml:lang="en">Line <var>{text}</var></d:text>
3614      <d:text xml:lang="ja"><var>{text}</var> 行</d:text>
3615    </d:cat>
3616    
3617    <d:cat name="column #">
3618      <d:text xml:lang="en">column <var>{text}</var></d:text>
3619      <d:text xml:lang="ja"><var>{text}</var> 列</d:text>
3620    </d:cat>
3621    
3622    <d:cat name="Index #">
3623      <d:text xml:lang="en">Index <var>{text}</var></d:text>
3624      <d:text xml:lang="ja">索引 #<var>{text}</var></d:text>
3625    </d:cat>
3626    
3627    <d:cat name="Unknown location">
3628      <d:text xml:lang="en">Unknown location</d:text>
3629      <d:text xml:lang="ja">位置不明</d:text>
3630    </d:cat>
3631    
3632    <d:cat name="Table #">
3633      <d:text xml:lang="en">Structure of Table #<var>{text}</var></d:text>
3634      <d:text xml:lang="ja">表 #<var>{text}</var> の構造</d:text>
3635    </d:cat>
3636    
3637    <d:cat name="Subdocument #">
3638      <d:text xml:lang="en">Subdocument #<var>{text}</var></d:text>
3639      <d:text xml:lang="ja">部分文書 #<var>{text}</var></d:text>
3640    </d:cat>
3641    
3642    <d:cat name="Sub #">
3643      <d:text xml:lang="en">Sub #<var>{text}</var></d:text>
3644      <d:text xml:lang="ja">部分 #<var>{text}</var></d:text>
3645    </d:cat>
3646    
3647    <d:cat name="...">
3648      <d:text xml:lang="en">..</d:text><!-- TODO: figure hyphen? -->
3649      <d:text xml:lang="ja">〜</d:text>
3650    </d:cat>
3651    
3652    <d:cat name="Score">
3653      <d:text xml:lang="en">Score</d:text>
3654      <d:text xml:lang="ja">得点</d:text>
3655    </d:cat>
3656    
3657    <d:cat name="Subtotal">
3658      <d:text xml:lang="en">Subtotal</d:text>
3659      <d:text xml:lang="ja">小計</d:text>
3660    </d:cat>
3661    
3662    <d:cat name="Total">
3663      <d:text xml:lang="en">Total</d:text>
3664      <d:text xml:lang="ja">合計</d:text>
3665    </d:cat>
3666    
3667    <d:cat name="Main document">
3668      <d:text xml:lang="en">Main document</d:text>
3669      <d:text xml:lang="ja">主文書</d:text>
3670    </d:cat>
3671    
3672    <d:cat name="Subdocuments">
3673      <d:text xml:lang="en">Subdocuments</d:text>
3674      <d:text xml:lang="ja">部分文書</d:text>
3675    </d:cat>
3676    
3677    <d:cat name="Transfer L.">
3678      <d:text xml:lang="en"><abbr title="Transfer protocol">Transfer</abbr></d:text>
3679      <d:text xml:lang="ja"><abbr title="転送プロトコル">転送</abbr></d:text>
3680    </d:cat>
3681    
3682    <d:cat name="Encode L.">
3683      <d:text xml:lang="en"><abbr title="Character encoding">Encoding</abbr></d:text>
3684      <d:text xml:lang="ja"><abbr title="文字符号化">符号</abbr></d:text>
3685    </d:cat>
3686    
3687    <d:cat name="Char L.">
3688      <d:text xml:lang="en"><abbr title="Coded characters">Character</abbr></d:text>
3689      <d:text xml:lang="ja"><abbr title="符号化文字">文字</abbr></d:text>
3690    </d:cat>
3691    
3692    <d:cat name="Syntax L.">
3693      <d:text xml:lang="en">Syntax</d:text>
3694      <d:text xml:lang="ja">構文</d:text>
3695    </d:cat>
3696    
3697    <d:cat name="Structure L.">
3698      <d:text xml:lang="en">Structure</d:text>
3699      <d:text xml:lang="ja">構造</d:text>
3700    </d:cat>
3701    
3702    <d:cat name="Semantics L.">
3703      <d:text xml:lang="en">Semantics</d:text>
3704      <d:text xml:lang="ja">意味</d:text>
3705    </d:cat>
3706    
3707    <d:cat name="N/A">
3708      <d:text xml:lang="en">N/A</d:text>
3709      <d:text xml:lang="ja">−</d:text>
3710    </d:cat>
3711    
3712    <d:cat name="No error found.">
3713      <d:text xml:lang="en">No error found.</d:text>
3714      <d:text xml:lang="ja">誤りは見つかりませんでした。</d:text>
3715    </d:cat>
3716    
3717    <d:cat name="No transfer error found.">
3718      <d:text xml:lang="en">This document has no transfer protocol header error.</d:text>
3719      <d:text xml:lang="ja">転送プロトコルの頭部に誤りは見つかりませんでした。</d:text>
3720    </d:cat>
3721    
3722    <d:cat name="No parse error found.">
3723      <d:text xml:lang="en">This document has no parse error.</d:text>
3724      <d:text xml:lang="ja">構文解析中に誤りは見つかりませんでした。</d:text>
3725    </d:cat>
3726    
3727    <d:cat name="No structural error found.">
3728      <d:text xml:lang="en">This document has no structral error.</d:text>
3729      <d:text xml:lang="ja">構造上の誤りは見つかりませんでした。</d:text>
3730    </d:cat>
3731    
3732    <d:cat name="This checker is work in progress.">
3733      <d:text xml:lang="en">
3734        <p><strong>Important</strong>: This conformance checking service
3735        is <em>under development</em>.  The result above might be <em>wrong</em>.</p>
3736      </d:text>
3737      <d:text xml:lang="ja">
3738        <p><strong>重要</strong>: この適合性検査サービスは<em>開発中</em>です。
3739        この結果は<em>間違い</em>かもしれません。</p>
3740      </d:text>
3741    </d:cat>
3742    
3743    <d:cat name="Conformance is conforming">
3744      <d:text xml:lang="en">No conformance‐error is
3745          found in this document.</d:text>
3746      <d:text xml:lang="ja">この文書に適合性に関わる誤りは見つかりませんでした。</d:text>
3747    </d:cat>
3748    
3749    <d:cat name="Conformance is should-error">
3750      <d:text xml:lang="en">This document
3751            is <strong>likely <em>non</em>-conforming</strong>, but in rare case
3752            it might be conforming.  The checker cannot determine whether
3753            this document is in the rare case or not.</d:text>
3754      <d:text xml:lang="ja">この文書は<strong>おそらく<em>不</em>適合</strong>ですが、
3755          稀に適合している場合もあります。適合性検査器はこの文書が稀な場合に該当するかどうか判定できません。</d:text>
3756    </d:cat>
3757    
3758    <d:cat name="Conformance is non-conforming">
3759      <d:text xml:lang="en">This document is
3760            <strong><em>non</em>-conforming</strong>.</d:text>
3761      <d:text xml:lang="ja">この文書は<strong><em>不</em>適合</strong>です。</d:text>
3762    </d:cat>
3763    
3764    <d:cat name="Conformance is uncertain">
3765      <d:text xml:lang="en">The conformance
3766            checker cannot decide whether the document is conforming or
3767            not, since the document contains one or more unsupported
3768            features.  The document might or might not be conforming.</d:text>
3769      <d:text xml:lang="ja">適合性検査器はこの文書が適合するかどうか判定できませんでした。
3770          この文書は適合性検査器が対応していない機能を使っています。
3771          この文書は適合しているかもしれませんし、していないかもしれません。</d:text>
3772    </d:cat>
3773    
3774    <d:cat name="Error level m">
3775      <d:text xml:lang="en"><a href="../error-description#level-m"><em class="rfc2119">MUST</em>‐level
3776            error</a></d:text>
3777      <d:text xml:lang="ja"><a href="../error-description#level-m"><em class="rfc2119" title="REQUIRED">必須</em>級の誤り</a></d:text>
3778    </d:cat>
3779    
3780    <d:cat name="Error level s">
3781      <d:text xml:lang="en"><a href="../error-description#level-s"><em class="rfc2119">SHOULD</em>‐level
3782            error</a></d:text>
3783      <d:text xml:lang="ja"><a href="../error-description#level-s"><em class="rfc2119" title="RECOMMENDED">推奨</em>級の誤り</a></d:text>
3784    </d:cat>
3785    
3786    <d:cat name="Error level w">
3787      <d:text xml:lang="en"><a href="../error-description#level-w">Warning</a></d:text>
3788      <d:text xml:lang="ja"><a href="../error-description#level-w">警告</a></d:text>
3789    </d:cat>
3790    
3791    <d:cat name="Error level i">
3792      <d:text xml:lang="en"><a href="../error-description#level-i">Information</a></d:text>
3793      <d:text xml:lang="ja"><a href="../error-description#level-i">情報</a></d:text>
3794    </d:cat>
3795    
3796    <d:cat name="Error level u">
3797      <d:text xml:lang="en"><a href="../error-description#level-u">Not
3798          supported</a></d:text>
3799      <d:text xml:lang="ja"><a href="../error-description#level-u">未対応</a></d:text>
3800    </d:cat>
3801    
3802    <section id="levels">
3803    <h2>Error Levels</h2>
3804    
3805    <table id="levels-table">
3806    <thead>
3807    <tr><th scope="col">Level</th>
3808    <th scope="col">Conforming?</th>
3809    <th scope="col">Description</th>
3810    </tr>
3811    </thead>
3812    <tbody>
3813    <tr id="level-m" class="level-m">
3814    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
3815    <td>Non‐conforming.</td>
3816    <td>A violation to a hard requirement of the specification.
3817    The document is non‐conforming.</td>
3818    </tr>
3819    <tr id="level-s" class="level-s">
3820    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
3821    <td>Non‐conforming, but <em>in some case</em>
3822    conforming.</td>
3823    <td>A violation to a requirement of the specification.
3824    The violation might be legitimize in some case.  Otherwise,
3825    the document is non‐conforming.</td>
3826    </tr>
3827    <tr id="level-w" class="level-w">
3828    <th scope="row">Warning</th>
3829    <td>Conforming.</td>
3830    <td>A warning is an advice from the conformance checker to avoid
3831    to solve a problem in a confusing or possibly wrong way.
3832    It does not affect to the conformance of the document, and
3833    may sometimes be inappropriate.</td>
3834    </tr>
3835    <tr id="level-i" class="level-i">
3836    <th scope="row">Information</th>
3837    <td>Conforming.</td>
3838    <td>An informational message just provides an additional information
3839    on the feature used in the document or the status of the retrieval
3840    or so on.
3841    It does not affect to the conformance of the document.</td>
3842    </tr>
3843    <tr id="level-u" class="level-u">
3844    <th scope="row">Not supported</th>
3845    <td><em>Unknown</em>.</td>
3846    <td>Some feature that is not supported by the conformance checker
3847    is used in the document.</td>
3848    </tr>
3849    </tbody>
3850    </table>
3851    </section>
3852    
3853  <section id="license">  <section id="license">
3854  <h2>License of This Document</h2>  <h2>License of This Document</h2>
3855    
3856  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>‐<time>2008</time>
3857  <p>This library is free software; you can redistribute it  <a href="http://suika.fam.cx/~wakaba/who?" rel="author" xml:lang="ja">Wakaba</a>
3858    <code class="mail">&lt;<a href="mailto:[email protected]">[email protected]</a>></code>.</p>
3859    
3860    <p>This document is free software; you can redistribute it
3861  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
3862  </section>  </section>
3863    
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