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revision 1.7 by wakaba, Sat Aug 11 13:54:55 2007 UTC revision 1.28 by wakaba, Fri Aug 15 16:03:46 2008 UTC
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8  <body>  <body>
9  <h1>Description of Errors</h1>  <h1>Description of Errors</h1>
10    
11    <section id="character-encoding-layer">
12    <h2>Character Encoding Layer Errors</h2>
13    
14    <div class="section error-category-charset" id="m:illegal-octets-error"><h3>An illegal octet in the input stream.</h3></div>
15    </section>
16    
17    <section id="html5-character-encoding">
18    <h2>HTML5 Character Encoding Errors</h2>
19    
20    <div class="section " id="disallowed-character-encoding"><h3>Character encoding <code><var>{text}</var></code>
21      is not allowed for <abbr>HTML</abbr> document.</h3>
22        <p>The character encoding used for the document is not allowed
23        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
24      </div>
25    
26    <div class="section " id="bad-character-encoding"><h3>Character encoding <code><var>{text}</var></code>
27      should not be used for <abbr>HTML</abbr> document.</h3>
28        <p>The character encoding used for the document is not recommended
29        for <abbr>HTML</abbr> document.  The document is non‐conforming
30        unless there is any good reason to use that encoding.</p>
31      </div>
32    
33    <div class="section " id="non-utf-8-character-encoding"><h3>Use of UTF-8 is encouraged (this document
34      is encoded in <code><var>{text}</var></code>).</h3>
35        <p>Use of UTF-8 as the character encoding of the document is encouraged,
36        though the use of another character encoding is still conforming.</p>
37      </div>
38    
39    <div class="section " id="character-encoding-unchecked"><h3>Conformance for character encoding requirements
40      cannot be checked, since the input is not a byte stream.</h3>
41        <p>The conformance checker cannot detect whether the input document
42        met the requirements on character encoding, since the document
43        is not inputed as a serialized byte sequence.  The document is
44        not conforming if it is not encoded in an appropriate character
45        encoding with appropriate labeling.</p>
46      </div>
47    
48    <div class="section " id="no-character-encoding-declaration"><h3>There is no character encoding
49      declaration.</h3>
50        <p>The document does not contain a character encoding
51        declaration.  Unless the character encoding is explicitly
52        specified in lower‐level protocol, e.g. in <abbr>HTTP</abbr>,
53        or is implied by <abbr>BOM</abbr>, there must be a character
54        encoding declaration.  The document is non‐conforming.</p>
55    
56        <p>The long character encoding declaration syntax
57        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"&gt;</code>
58        is obsolete.  The new syntax is:</p>
59        <pre class="html example">
60    <code>&lt;meta charset="<var>charset-name</var>"&gt;</code></pre>
61    
62        <p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr>
63        declaration has no effect for <abbr>HTML</abbr> document.</p>
64      </div>
65    
66    <div class="section " id="non-ascii-superset"><h3>No character encoding metadata is found
67      in lower‐level protocol nor is there <abbr>BOM</abbr>, while
68      character encoding <code><var>{text}</var></code>
69      is not a superset of <abbr>ASCII</abbr>.</h3>
70        <p>The document is not labeled with character encoding name
71        in lower‐level protocol, e.g. in <abbr>HTTP</abbr>, and
72        the document is not begin with <abbr>BOM</abbr>.  In addition,
73        the character encoding of the document is not a superset of
74        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
75    
76        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
77        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
78        as:</p>
79        <pre class="http example">
80    <code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
81    
82        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
83        <code class="html example">&lt;meta charset="<var>charset-name</var>"&gt;</code>,
84        does not allow to omit <code>charset</code> parameter
85        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
86        compatible encoding.</p>
87    
88        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
89        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
90        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
91      </div>
92    
93    <div class="section " id="sniffing:chardet"><h3>Character encoding of this document is sniffed
94      as <code><var>{text}</var></code> (Sniffed because no explicit specification
95      for the character encoding of this document is found in the transfer
96      procotol headers).</h3></div>
97    
98    <div class="section " id="sniffing:default"><h3>Character encoding of this document is defaulted
99      to <code><var>{text}</var></code> because no explicit specification
100      for the character encoding of this document is found in the transfer
101      procotol headers.</h3></div>
102    
103    <div class="section " id="chardecode:fallback"><h3>Since no decoder for the document character
104      encoding is found, decoder for the character encoding
105      <code><var>{text}</var></code> is used.  Checking results might be
106      <em>wrong</em>.</h3></div>
107    
108    <div class="section " id="chardecode:no-error"><h3>Conformance error checking for the character
109      encoding <code><var>{text}</var></code> is not supported.</h3></div>
110    
111    <div class="section " id="charset-label:matching"><h3>Sniffed character encoding
112      <code><var>{text}</var></code> is same as the character encoding specified
113      in the character encoding declaration.  This is <em>not</em> an
114      error.</h3></div>
115    
116    <div class="section format-charset warning" id="charset-label-detected"><h3>While parsing the document as
117      <code><var>{text}</var></code>, a character encoding declaration specifying
118      a different character encoding is found.  The document
119      is reparsed.</h3>
120        <p>While parsing a document in a character encoding,
121        a character encoding declaration which declares the character
122        encoding of the document as another character encoding is found.
123        The occurence of this warning itself does not make the document
124        non‐conforming.  However, the failure of the first attempt to
125        to detect the character encoding might be a result of non‐conformance
126        of the document.</p>
127    
128        <p>The document will be reparsed from the beginning.  Some error
129        or warning might be reported again.</p>
130    
131        <p>These are suggestions to avoid this warning:</p>
132        <ul>
133        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
134        field in the <abbr>HTTP</abbr> header, as:
135        <pre class="HTTP example">
136    <code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
137        <li>Put the character encoding declaration
138        (<code class="html example">&lt;meta charset="<var>charset-name</var>"&gt;</code>)
139        just after <code class="html example">&lt;head&gt;</code> start tag.</li>
140        <li>Use <code>UTF-8</code>.</li>
141        </ul>
142      </div>
143    
144    <div class="section " id="NULL"><h3>The <code class="charname">NULL</code> character
145      is not allowed.</h3></div>
146    
147    <div class="section " id="control-char"><h3>Code point <code><var>{text}</var></code> is
148      not allowed.</h3></div>
149    
150    </section>
151    
152  <section id="html5-tokenize-error">  <section id="html5-tokenize-error">
153  <h2>HTML5 Parse Errors in Tokenization Stage</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
154    
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173      element.</p>      element.</p>
174    </div>    </div>
175    
176    <div class="section tokenize-error" id="bad-attribute-name"><h3>Attribute name cannot contain characters
177      <code>"</code>, <code>'</code>, and <code>=</code>.</h3></div>
178    
179    <div class="section tokenize-error" id="bad-attribute-value"><h3>Attribute value must be quoted by <code>"</code>
180      or <code>'</code> if it contains a <code>"</code>, <code>'</code>, or
181      <code>=</code> character.</h3></div>
182    
183  <div class="section tokenize-error" id="bare-ero"><h3>The <code>&amp;</code> character must  <div class="section tokenize-error" id="bare-ero"><h3>The <code>&amp;</code> character must
184    introduce a reference.</h3>    be escaped as <code class="html example">&amp;amp;</code>.</h3>
185      <p>An <code>&amp;</code> (<code>U+0026</code>      <p>An <code>&amp;</code> character which
     <code class="charname">AMPERSAND</code>) character which  
186      is not part of any reference appears in the input stream.      is not part of any reference appears in the input stream.
187      The document is non-conforming.</p>      The document is non‐conforming.</p>
188    
189        <p><em>Any <code>&amp;</code> character in URI (or IRI)
190        must be escaped as <code class="example">&amp;amp;</code>.</em></p>
191    
192      <p>The <code>&amp;</code> character must      <p>The <code>&amp;</code> character must
193      be the first character of a reference:      be the first character of a reference:
194        <dl>        <dl class="switch">
195        <dt>Named entity reference</dt>        <dt>Named entity reference</dt>
196            <dd><pre class="html example">            <dd><pre class="html example">
197  <code>&amp;<var>entity-name</var>;</code></pre>  <code>&amp;<var>entity-name</var>;</code></pre>
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261    
262      <p>The string <code>&amp;#</code> must be the first two characters      <p>The string <code>&amp;#</code> must be the first two characters
263      of a reference:      of a reference:
264        <dl>        <dl class="switch">
265        <dt>Numeric character reference</dt>        <dt>Numeric character reference</dt>
266            <dd><pre class="html example">            <dd><pre class="html example">
267  <code>&amp;#<var>d</var>;</code></pre>  <code>&amp;#<var>d</var>;</code></pre>
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302      </p>      </p>
303    </div>    </div>
304    
305  <div class="section tokenize-error" id="bogus-end-tag"><h3>A <code>&lt;/</code> string is not followed  <div class="section tokenize-error" id="bogus-comment"><h3>String <code>&lt;!</code> is not followed
306    by a tag name.</h3>    by <code>--</code>.</h3>
307        <p>There is a <code>&lt;</code> (<code>U+003C</code>
308        <code class="charname">LESS-THAN SIGN</code>) character
309        followed by a <code>!</code> (<code>U+0021</code>
310        <code class="charname">EXCLAMATION MARK</code>) character,
311        which is not followed by a <code>--</code> or
312        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
313    
314        <dl class="switch">
315        <dt>Comments</dt>
316          <dd>In HTML document, comments must be introduced by
317          <code class="example">&lt;!--</code> (<code>&lt;!</code>
318          <em>immediately</em> followed
319          by <em>two</em> <code>-</code>s) and must be terminated by
320          <code class="example">--&gt;</code>.
321          Strings <code>&lt;!</code> not followed
322          by <code>--</code> and <code>&lt;!-</code> not followed by
323          <code>-</code> are not valid open delimiters for comments.</dd>
324        <dt>Marked sections, including <code>CDATA</code> sections</dt>
325          <dd>Marked sections are not allowed in HTML document.</dd>
326        <dt>Markup declarations</dt>
327          <dd>Markup declarations, except for <code>DOCTYPE</code>
328          and comment declarations, are not allowed in HTML document.</dd>
329        <dt>String <code>&lt;!</code></dt>
330          <dd>String <code>&lt;!</code> must be escaped as
331          <code class="example">&amp;lt;!</code>.</dd>
332        </dl>
333      </div>
334    
335    <div class="section tokenize-error" id="bogus-end-tag"><h3>String <code>&lt;/</code> is not followed
336      by tag name.</h3>
337      <p>There is a <code>&lt;</code> (<code>U+003C</code>      <p>There is a <code>&lt;</code> (<code>U+003C</code>
338      <code class="charname">LESS-THAN SIGN</code>) character      <code class="charname">LESS-THAN SIGN</code>) character
339      immediately followed by a <code>/</code> (<code>U+005F</code>      immediately followed by a <code>/</code> (<code>U+005F</code>
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351      </p>      </p>
352    </div>    </div>
353    
354    <div class="section tokenize-error" id="C1-character-reference"><h3>Character reference to
355      <code><var>{text}</var></code> is not allowed.</h3></div>
356    
357    <div class="section tokenize-error" id="CR-character-reference"><h3>Character reference to
358      <code>U+000D</code> (<code class="charname">CARRIAGE RETURN</code>)
359      is not allowed.</h3></div>
360    
361  <div class="section tokenize-error" id="dash-in-comment"><h3>There is a <code>--</code> sequence  <div class="section tokenize-error" id="dash-in-comment"><h3>There is a <code>--</code> sequence
362    in a comment.</h3>    in a comment.</h3>
363      <p>There is a <code>-</code> (<code>U+002D</code>      <p>There is a <code>-</code> (<code>U+002D</code>
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372    </div>    </div>
373    
374  <div class="section tokenize-error" id="duplicate-attribute"><h3>There are two attributes with name  <div class="section tokenize-error" id="duplicate-attribute"><h3>There are two attributes with name
375        <code><var>$0</var></code>.</h3>        <code><var>{text}</var></code>.</h3>
376      <p>There are more than one attributes with the same      <p>There are more than one attributes with the same
377      name in a tag.  The document is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
378    
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380      Use <code>img</code> element with animation GIF instead.</p>      Use <code>img</code> element with animation GIF instead.</p>
381    </div>    </div>
382    
383  <div class="section tokenize-error" id="nestc"><h3>Void element syntax (<code>/&gt;</code>) cannot be  <div class="section tokenize-error" id="empty-start-tag"><h3>Empty start tag (<code>&lt;&gt;</code>) is not
384      allowed.</h3></div>
385    
386    <div class="section tokenize-error" id="empty-end-tag"><h3>Empty end tag (<code>&lt;/&gt;</code>) is not
387      allowed.</h3></div>
388    
389    <div class="section tokenize-error" id="end-tag-attribute"><h3>End tag cannot have attributes.</h3></div>
390    
391    <div class="section tokenize-error" id="invalid-character-reference"><h3>Character reference to
392      <code><var>{text}</var></code> is not allowed.</h3></div>
393    
394    <div class="section tokenize-error" id="nestc"><h3>Polytheistic slash (<code>/&gt;</code>) cannot be
395    used for this element.</h3>    used for this element.</h3>
396      <p>Void element syntax (<code>/&gt;</code>) must not be used      <p>Polytheistic slash (<code>/&gt;</code>) must not be used
397      for the element.  The document is non-conforming.</p>      for the element.  The document is non-conforming.</p>
398    
399      <p>The void element syntax can only be      <p>The polytheistic slash can only be
400      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
401      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
402      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
403      <code>col</code>, and <code>input</code> elements.</p>      <code>col</code>, and <code>input</code> elements.</p>
404    
405      <p>Note that, unlike in XML, the void element syntax has      <dl class="switch">
406        <dt><code>&lt;script/&gt;</code></dt>
407            <dd><p>The polytheistic slash cannot be used for <code>script</code>
408            element.  Even for an empty <code>script</code> element,
409            there must be an explicit end tag
410            <code class="html example">&lt;/script&gt;</code>.</p>
411    
412            <p><strong>NOTE</strong>: Though some user agents interpret
413            polytheistic slash for <code>script</code> element as the
414            closing of the element, such usage is not allowed under
415            the current standard.</p></dd>
416        <dt><code>&lt;basefont/&gt;</code>, <code>&lt;bgsound/&gt;</code>,
417        <code>&lt;frame/&gt;</code>, <code>&lt;keygen/&gt;</code>,
418        <code>&lt;spacer/&gt;</code>, <code>&lt;wbr/&gt;</code></dt>
419            <dd>These elements are themselves non-conforming.</dd>
420        <!-- isindex, image -->
421        <dt><code>&lt;command/&gt;</code>, <code>&lt;event-source/&gt;</code>,
422        <code>&lt;nest/&gt;</code>, or <code>&lt;source/&gt;</code></dt>
423            <dd>Future revision of HTML5 parsing algorithm is expected
424            to allow polytheistic slash for these elements.</dd>
425        <dt><code>&lt;a/&gt;</code>, <code>&lt;p/&gt;</code></dt>
426            <dd>These elements are not always empty and therefore
427            polytheistic slash is not allowed.  Use explicit end tag
428            to represent empty element as:
429              <pre class="example html">
430    <code>&lt;p&gt;&lt;/p&gt;</code></pre>
431            </dd>
432        </dl>
433    
434        <p>Note that, unlike in XML, the polytheistic slash has
435      no effect in HTML.</p>      no effect in HTML.</p>
436    </div>    </div>
437    
438    <div class="section tokenize-error" id="no-DOCTYPE-name"><h3>After the string <code>&lt;!DOCTYPE </code>, the
439      document type name must be specified.</h3></div>
440    
441    <div class="section tokenize-error" id="no-PUBLIC-literal"><h3>After the keyword <code>PUBLIC</code>, no
442      oublic identifier is specified.</h3></div>
443    
444    <div class="section tokenize-error" id="no-refc"><h3>Character reference must be closed by a
445      <code>;</code> character.</h3></div>
446    
447    <div class="section tokenize-error" id="no-space-before-DOCTYPE-name"><h3>After the string <code>&lt;!DOCTYPE</code>, there
448      must be at least a white space character before the document type
449      name.</h3></div>
450    
451    <div class="section tokenize-error" id="no-space-between-attributes"><h3>Attributes must be separeted by at least a
452      white space character.</h3></div>
453    
454    <div class="section tokenize-error" id="no-SYSTEM-literal"><h3>After the keyword <code>SYSTEM</code>, no
455      system identifier is specified.</h3></div>
456    
457  <div class="section tokenize-error" id="pio"><h3>Processing instruction  <div class="section tokenize-error" id="pio"><h3>Processing instruction
458    (<code>&lt;?<var>...</var>?&gt;</code>) cannot be used.</h3>    (<code>&lt;?<var>...</var>&gt;</code>) is not allowed in HTML
459      document.</h3>
460      <p>Processing instructions (<code>&lt;?<var>...</var>?&gt;</code>),      <p>Processing instructions (<code>&lt;?<var>...</var>?&gt;</code>),
461      including XML declaration (<code>&lt;?xml <var>...</var>?&gt;</code>)      including XML declaration (<code>&lt;?xml <var>...</var>?&gt;</code>)
462      and XML style sheet <abbr title="processing instruction">PI</abbr>      and XML style sheet <abbr title="processing instruction">PI</abbr>
463      (<code>&lt;xml-stylesheet <var>...</var>?&gt;</code>), are not allowed      (<code>&lt;?xml-stylesheet <var>...</var>?&gt;</code>), are not allowed
464      in the HTML syntax.  The document is non-conforming.</p>      in the HTML syntax.  The document is non-conforming.</p>
465    
466      <p>If it is necessary to embed a processing instruction      <dl class="switch">
467      in the HTML document, you must use the XML syntax instead.</p>      <dt><code>&lt;?xbl?&gt;</code> (<abbr>XBL</abbr> Association)</dt>
468          <dd>An <abbr>XBL</abbr> binding cannot be associated by
469      <p>In the HTML syntax, XML declaration is not necessary.</p>        <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
470          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
471      <p>Instead of XML style sheet,        style sheet as:
472      <abbr title="processing instruction">PI</abbr>s, you must          <pre class="html example">
473      use the HTML <code>link</code> element whose <code>rel</code>  <code>&lt;style&gt;
474      attribute is set to <code>stylesheet</code> (or  p {
475      <code>alternate stylesheet</code> for an aleternate style sheet).</p>    binding: url(binding.xbl);
476    }
477    &lt;/style&gt;</code></pre>
478          </dd>
479        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
480            <dd>XML declaration is unnecessary for HTML documents.</dd>
481        <dt><code>&lt;?xml-stylesheet?&gt;</code> (XML style sheet
482        <abbr title="processing instruction">PI</abbr>)</dt>
483            <dd>Use HTML <code>link</code> element with <code>rel</code>
484            attribute set to <code>stylesheet</code> (or,
485            <code>alternate stylesheet</code> for an alternate style
486            sheet).
487              <pre class="example html">
488    <code>&lt;link rel=stylesheet href="path/to/stylesheet.css"&gt;</code></pre>
489            </dd>
490        <dt><code>&lt;?php?&gt;</code> or
491        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
492        (<abbr>PHP</abbr> code)</dt>
493            <dd>The conformance checker does <em>not</em> support
494            checking for PHP source documents.</dd>
495        <dt>Other processing instructions</dt>
496            <dd>Processing instructions cannot be inserted in an HTML
497            document.  Use XML document or insert
498            <code>ProcessingInstruction</code> node by scripting.</dd>
499        </dl>
500    
501      <p>Web browsers will parse processing instructions as bogus      <p>Web browsers will parse processing instructions as bogus
502      comments.  Some legacy Web browsers, such as IE:mac and      comments.  Some legacy Web browsers, such as IE:mac and
503      some mobile browsers, will display processing instructions      some mobile Web browsers, will display processing instructions
504      as string.</p>      as string.</p>
505    </div>    </div>
506    
507    <div class="section tokenize-error" id="string-after-DOCTYPE-name"><h3>There is a bogus string after the document type
508      name.</h3></div>
509    
510    <div class="section tokenize-error" id="string-after-PUBLIC"><h3>There is a bogus string after the keyword
511      <code>PUBLIC</code>.</h3></div>
512    
513    <div class="section tokenize-error" id="string-after-PUBLIC-literal"><h3>There is a bogus string after the public
514      identifier.</h3></div>
515    
516    <div class="section tokenize-error" id="string-after-SYSTEM"><h3>There is a bogus string after the keyword
517      <code>SYSTEM</code>.</h3></div>
518    
519    <div class="section tokenize-error" id="string-after-SYSTEM-literal"><h3>There is a bogus string after the system
520      identifier.</h3></div>
521    
522    <div class="section tokenize-error" id="unclosed-attribute-value"><h3>Attribute value is not closed by a quotation
523      mark.</h3></div>
524    
525    <div class="section tokenize-error" id="unclosed-comment"><h3>Comment is not closed by a string
526      <code>--&gt;</code>.</h3></div>
527    
528    <div class="section tokenize-error" id="unclosed-DOCTYPE"><h3>The <code>DOCTYPE</code> is not closed by a
529      <code>&gt;</code> character.</h3></div>
530    
531    <div class="section tokenize-error" id="unclosed-PUBLIC-literal"><h3>The public identifier literal is not closed by a
532      quotation mark.</h3></div>
533    
534    <div class="section tokenize-error" id="unclosed-SYSTEM-literal"><h3>The system identifier literal is not closed by a
535      quotation mark.</h3></div>
536    
537    <div class="section tokenize-error" id="unclosed-tag"><h3>Tag is not closed by a <code>&gt;</code>
538      character.</h3></div>
539    
540  </section>  </section>
541    
542  <section id="html5-parse-errors">  <section id="html5-parse-errors">
543  <h2>HTML5 Parse Errors in Tree Construction Stage</h2>  <h2>HTML5 Parse Errors in Tree Construction Stage</h2>
544    
545  <div class="section parse-error" id="after-head"><h3>The <code><var>$0</var></code> element cannot be  <div class="section parse-error" id="after-body"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code> is
546    inserted between <code>head</code> and <code>body</code> elements.</h3>    not allowed after the <code>body</code> is closed.</h3></div>
547    
548    <div class="section parse-error" id="after-body:/"><h3>End tag <code>&lt;/<var>{text}</var>&gt;</code> is
549      not allowed after the <code>body</code> is closed.</h3></div>
550    
551    <div class="section parse-error" id="after-body:#text"><h3>Non‐white‐space characters are not allowed
552      after the <code>body</code> is closed.</h3></div>
553    
554    <div class="section parse-error" id="after-frameset"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code> is
555      not allowed after the <code>frameset</code> is closed.</h3></div>
556    
557    <div class="section parse-error" id="after-frameset:/"><h3>End tag <code>&lt;/<var>{text}</var>&gt;</code> is
558      not allowed after the <code>frameset</code> is closed.</h3></div>
559    
560    <div class="section parse-error" id="after-frameset:#text"><h3>Non‐white‐space characters are not allowed
561      after the <code>frame</code> is closed.</h3></div>
562    
563    <div class="section parse-error" id="after-head"><h3>The <code><var>{text}</var></code> element cannot be
564      inserted between <code>head</code> and <code>body</code>
565      elements.</h3>
566      <p>A start tag appears after the <code>head</code> element is closed      <p>A start tag appears after the <code>head</code> element is closed
567      but before the <code>body</code> element is opened.      but before the <code>body</code> element is opened.
568      The document is non-conforming.</p>      The document is non-conforming.</p>
569    </div>    </div>
570    
571  <div class="section parse-error" id="DOCTYPE-in-the-middle"><h3>A <code>DOCTYPE</code> appears after any  <div class="section parse-error" id="after-html"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code> is
572    element or data character has been seen.</h3>    not allowed after the <code>html</code> is closed.</h3></div>
573      <p>A <code>DOCTYPE</code> appears after any element or data character  
574      has been seen.  The document is non-conforming.</p>  <div class="section parse-error" id="after-html:/"><h3>End tag <code>&lt;/<var>{text}</var>&gt;</code> is
575          not allowed after the <code>html</code> is closed.</h3></div>
576      <p>The <code>DOCTYPE</code> must be placed before any  
577      tag, reference, or data character.  Only white space characters  <div class="section parse-error" id="after-html:#text"><h3>Non‐white‐space characters are not allowed
578      and comments can be inserted before the <code>DOCTYPE</code>.</p>    after the <code>html</code> is closed.</h3></div>
579    </div>  
580    <div class="section parse-error" id="image"><h3>The <code>image</code> element is
581      obsolete.</h3></div>
582    
583  <div class="section parse-error" id="in-a:a"><h3>Anchor cannot be nested.</h3>  <div class="section parse-error" id="in-a:a"><h3>Anchor cannot be nested.</h3>
584      <p>HTML <code>a</code> elements cannot be nested.      <p>HTML <code>a</code> elements cannot be nested.
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588      implies the end tag of any opening <code>a</code> element.</p>      implies the end tag of any opening <code>a</code> element.</p>
589    </div>    </div>
590    
591  <div class="section parse-error" id="in-body"><h3>Tag <code>&lt;<var>$0</var>&gt;</code>  <div class="section parse-error" id="in-body"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code>
592    is not allowed in a <code>body</code> element.</h3>    is not allowed in the <code>body</code> element.</h3>
593      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
594      cannot be a descendant of <code>body</code> element, appears      cannot be a descendant of <code>body</code> element, appears
595      in the input stream while the <code>body</code> element has been opened.      in the input stream while the <code>body</code> element has been opened.
596      The document is non-conforming.</p>      The document is non-conforming.</p>
597    </div>    </div>
598    
599  <div class="section parse-error" id="in-head:head"><h3>Start tag <code>&lt;<var>head</var>&gt;</code>  <div class="section parse-error" id="in-body:#eof"><h3>Some element is not closed before the end of
600      file.</h3></div>
601    
602    <div class="section parse-error" id="in-button:button"><h3>The <code>button</code> element cannot be
603      nested.</h3></div>
604    
605    <div class="section parse-error" id="in-CDATA:#eof"><h3>Element is not closed before the end of
606      file.</h3></div>
607    
608    <div class="section parse-error" id="in-form:form"><h3>Start tag <code>&lt;form&gt;</code> is
609      not allowed in a <code>form</code> element.</h3></div>
610    
611    <div class="section parse-error" id="in-frameset"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code> is
612      not allowed in a <code>framset</code> element.</h3></div>
613    
614    <div class="section parse-error" id="in-frameset:/"><h3>End tag <code>&lt;/<var>{text}</var>&gt;</code> is
615      not allowed in a <code>frameset</code> element.</h3></div>
616    
617    <div class="section parse-error" id="in-frameset:#text"><h3>Non‐white‐space characters are not allowed
618      in a <code>frameset</code> element.</h3></div>
619    
620    <div class="section parse-error" id="in-head:head"><h3>Start tag <code>&lt;head&gt;</code>
621    is not allowed in the <code>head</code> element.</h3>    is not allowed in the <code>head</code> element.</h3>
622      <p>There is a start tag <code>&lt;head&gt;</code> in the      <p>There is a start tag <code>&lt;head&gt;</code> in the
623      <code>&lt;head&gt;</code> element.  The document is non-conforming.</p>      <code>&lt;head&gt;</code> element.  The document is non-conforming.</p>
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627      start tag <code>&lt;head&gt;</code> can appear in the input stream.</p>      start tag <code>&lt;head&gt;</code> can appear in the input stream.</p>
628    </div>    </div>
629    
630  <div class="section parse-error" id="in-table"><h3>Tag <code>&lt;<var>$0</var>&gt;</code>  <div class="section parse-error" id="in-html:#DOCTYPE"><h3>A <code>DOCTYPE</code> appears after any
631      element or data character has been seen.</h3>
632        <p>A <code>DOCTYPE</code> appears after any element or data character
633        has been seen.  The document is non-conforming.</p>
634        
635        <p>The <code>DOCTYPE</code> must be placed before any
636        tag, reference, or data character.  Only white space characters
637        and comments can be inserted before the <code>DOCTYPE</code>.</p>
638      </div>
639    
640    <div class="section parse-error" id="in-nobr:nobr"><h3>The <code>nobr</code> element cannot be
641      nested.</h3></div>
642    
643    <div class="section parse-error" id="in-noscript"><h3>The <code><var>{text}</var></code> element is not
644      allowed in a <code>noscript</code> element in the
645      <code>head</code> element.</h3></div>
646    
647    <div class="section parse-error" id="in-noscript:/"><h3>An end tag <code>&lt;/<var>{text}</var>&gt;</code>
648      appers before the <code>noscript</code> element is closed.</h3></div>
649    
650    <div class="section parse-error" id="in-noscript:#eof"><h3>A <code>noscript</code> element is not closed
651      before the end of file.</h3></div>
652    
653    <div class="section parse-error" id="in-noscript:#text"><h3>Non‐white‐space characters are not allowed
654      in a <code>noscript</code> element in the <code>head</code>
655      element.</h3></div>
656    
657    <div class="section parse-error" id="in-PCDATA:#eof"><h3>Element is not closed before the end of
658      file.</h3></div>
659    
660    <div class="section parse-error" id="in-select"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code>
661      is not allowed in a <code>select</code> element.</h3></div>
662    
663    <div class="section parse-error" id="in-select:/"><h3>End tag <code>&lt;/<var>{text}</var>&gt;</code>
664      is not allowed in a <code>select</code> element.</h3></div>
665    
666    <div class="section parse-error" id="in-table"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code>
667    is not allowed in a <code>table</code> element.</h3>    is not allowed in a <code>table</code> element.</h3>
668      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
669      cannot be a child of <code>table</code> element, appears      cannot be a child of <code>table</code> element, appears
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677      a table caption.</p>      a table caption.</p>
678    </div>    </div>
679    
680  <div class="section parse-error" id="in-table:#character"><h3>Data character is not allowed in  <div class="section parse-error" id="in-table:/"><h3>End tag <code>&lt;/<var>{text}</var>&gt;</code>
681    <code>table</code>.</h3>    is not allowed in a <code>table</code> element.</h3></div>
682      <p>A data character appears in <code>table</code>.  The document  
683      is non-conforming.</p>  <div class="section parse-error" id="in-table:#text"><h3>Non‐white‐space character is not allowed within
684      the <code>table</code> element, outside of the caption and cells.</h3>
685        <p>A non‐white‐space character appears in <code>table</code>.
686        The document is non-conforming.</p>
687    
688      <p>In <code>table</code>, only table related elements      <p>In <code>table</code>, only table related elements
689      are allowed; any other element and data character must be contained in      are allowed; any other element and data character must be contained in
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692      a table caption.</p>      a table caption.</p>
693    </div>    </div>
694    
695    <div class="section parse-error" id="isindex"><h3>The <code>isindex</code> element is
696      obsolete.</h3></div>
697    
698  <div class="section parse-error" id="missing-start-tag:tr"><h3>Start tag of <code>tr</code>  <div class="section parse-error" id="missing-start-tag:tr"><h3>Start tag of <code>tr</code>
699    element is missing.</h3>    element is missing.</h3>
700      <p>Start tag of a <code>tr</code> element, which is <em>not</em>      <p>Start tag of a <code>tr</code> element, which is <em>not</em>
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718      </p>      </p>
719    
720      <p>Only white space characters and comments are allowed      <p>Only white space characters and comments are allowed
721      before the <code>DOCTYPE</code>.</p>      before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
722        allowed in HTML document.</p>
723    </div>    </div>
724    
725  <div class="section parse-error" id="not-closed"><h3>Element <code><var>$0</var></code> is not  <div class="section parse-error" id="not-closed"><h3>Element <code><var>{text}</var></code> is not
726    closed.</h3>    closed.</h3>
727      <p>End tag of an element is not found before, for example,      <p>End tag of an element is not found before, for example,
728      an end tag of another element appears or      an end tag of another element appears or
729      the end of the document.  The document is non-conforming.</p>      the end of the document.  The document is non-conforming.</p>
730    
731        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
732        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
733        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
734        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
735        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
736        <code>th</code>, <code>thead</code>, <code>tr</code>,
737        <code>ul</code> end tag can be omitted in HTML documents.
738        For any element except for void element, there must be an explicit
739        end tag.</p>
740    
741        <dl class="switch">
742        <dt>HTML <code>canvas</code> element</dt>
743          <dd>Though the element is void in earlier versions of Safari,
744          the <code>canvas</code> element is <em>no</em> longer
745          defined as empty.  There must be an end tag
746          <code class="html example">&lt;/canvas&gt;</code>.</dd>
747        </dl>
748    
749        <p>Note that misnesting tags, such as
750        <code class="bad example">&lt;a&gt;&lt;b&gt;&lt;/a&gt;&lt;/b&gt;</code>, are not
751        allowed and they also cause this error.</p>
752    </div>    </div>
753    
754  <div class="section parse-error" id="not-first-start-tag"><h3>This <code>&lt;html&gt;</code> tag is not  <div class="section parse-error" id="not-first-start-tag"><h3>This <code>&lt;html&gt;</code> tag is not
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769    HTML.</h3>    HTML.</h3>
770      <p>The document contains a <code>DOCTYPE</code> declaration      <p>The document contains a <code>DOCTYPE</code> declaration
771      that is different from HTML5 <code>DOCTYPE</code> (i.e.      that is different from HTML5 <code>DOCTYPE</code> (i.e.
772      <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>      <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
773        The document is non‐conforming.</p>
774    
775      <p>The document might or might not be conformant to      <p>The document might or might not be conformant to
776      some version of HTML.  However, conformance to any HTML      some version of HTML.  However, conformance to any HTML
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779      HTML document (roughly) as defined in HTML5.</p>      HTML document (roughly) as defined in HTML5.</p>
780    </div>    </div>
781    
782  <div class="section parse-error" id="unmatched-end-tag"><h3>Element <code><var>$0</var></code> is not  <div class="section parse-error" id="start-tag-not-allowed"><h3>Start tag <code>&lt;<var>{text}</var>&gt;</code> is
783      not allowed here.</h3></div>
784    
785    <div class="section parse-error" id="unmatched-end-tag"><h3>Element <code><var>{text}</var></code> is not
786    opened.</h3>    opened.</h3>
787      <p>An end tag appears though no element with the same name      <p>An end tag appears though no element with the same name
788      has been opened.  The document is non-conforming.</p>      has been opened.  The document is non-conforming.</p>
789    
790      <p>For any end tag in HTML document, there must be a      <p>For any end tag in HTML document, there must be a
791      corresponding start tag.</p>      corresponding start tag.</p>
792    
793        <dl class="switch">
794        <dt>HTML <code>base</code>, <code>basefont</code>,
795        <code>bgsound</code>, <code>br</code>, <code>col</code>,
796        <code>embed</code>, <code>frame</code>, <code>hr</code>,
797        <code>image</code>, <code>img</code>, <code>input</code>,
798        <code>isindex</code>, <code>link</code>, <code>meta</code>,
799        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
800          <dd>End tag is not allowed for these elements, since
801          those content must always be empty.  Remove end tag.</dd>
802        <!-- keygen -->
803        <!-- command, event-source, nest, source -->
804        </dl>
805    </div>    </div>
806    
807  </section>  </section>
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809  <section id="element-content-model-errors">  <section id="element-content-model-errors">
810  <h2>Element Content Model Errors</h2>  <h2>Element Content Model Errors</h2>
811    
812  <div class="section content-model-error" id="character-not-allowed"><h3>Data character is not allowed in this  <div class="section " id="basehref-after-URL-attribute"><h3>The <code>base</code> element with the
813      <code>href</code> attribute specified cannot be placed after
814      any attribute with a URL.</h3></div>
815    
816    <div class="section " id="basetarget-after-hyperlink"><h3>The <code>base</code> element with the
817      <code>target</code> attribute specified cannot be placed after
818      any element that defines a hyperlink.</h3></div>
819    
820    <div class="section " id="character-not-allowed"><h3>Data character is not allowed in this
821    context.</h3>    context.</h3>
822      <p>A data character appears where it is not allowed in this      <p>A data character appears where it is not allowed in this
823      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
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840      </p>      </p>
841    </div>    </div>
842    
843  <div class="section content-model-error" id="child-element-missing"><h3>There must be a <code><var>$0</var></code>  <div class="section " id="character-not-allowed:empty"><h3>Non‐white‐space characters are not allowed in
844    element as a child of this element.</h3>    an empty element.</h3></div>
845    
846    <div class="section " id="character-not-allowed:atom|PersonConstruct"><h3>Non‐white‐space characters are not allowed in
847      Person construct.</h3></div>
848    
849    <div class="section " id="character-not-allowed:atom|TextConstruct"><h3>Non‐white‐space characters are not allowed in
850      Text construct.</h3></div>
851    
852    <div class="section " id="child-element-missing"><h3>There must be an element
853      <code><var>{text}</var></code> as a child of this element.</h3>
854      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
855      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
856      The document is non-conforming.</p>      The document is non-conforming.</p>
857    
858      <p>For example:      <dl class="switch">
859        <ul>      <dt>HTML <code>head</code> element</dt>
860        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
861        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
862        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
863        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
864        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
865        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
866      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
867        </dl>
868    </div>    </div>
869    
870  <div class="section content-model-error" id="child-element-missing:td|th"><h3>There must be a <code>td</code>  <div class="section content-model-error" id="child-element-missing:td|th"><h3>There must be a <code>td</code>
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874      is non-conforming.</p>      is non-conforming.</p>
875    </div>    </div>
876    
877  <div class="section content-model-error" id="element-not-allowed"><h3>This element is not allowed in this  <div class="section " id="child-element-missing:atom"><h3>There must be an element
878      <code><var>{text}</var></code> in the Atom namespace as a child of this
879      element.</h3></div>
880    
881    <div class="section " id="child-element-missing:atom:link:alternate"><h3>There must be an Atom <code>link</code> element
882      whose <code>rel</code> attribute is set to <code>alternate</code> as a
883      child of this element.</h3></div>
884    
885    <div class="section " id="child-element-missing:atom:link:self"><h3>There should be an Atom <code>link</code> element
886      whose <code>rel</code> attribute is set to <code>self</code> as a
887      child of this element.</h3></div>
888    
889    <div class="section " id="element-missing:hn"><h3>There must be at least one
890      <code>h<var>n</var></code> element descendant.</h3></div>
891    
892    <div class="section " id="element-not-allowed"><h3>This element is not allowed in this
893    context.</h3>    context.</h3>
894      <p>An element appears where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
895      is non-conforming.</p>      is non-conforming.</p>
896    
     <p><strong>Note</strong>: The conformance checker does  
     <em>not</em> support form elements yet.</p>  
   
897      <p>Possible causes:      <p>Possible causes:
898        <dl class="switch">        <dl class="switch">
899        <dt>If the element with the error is an inline-level element,        <dt>If the element with the error is an inline-level element,
# Line 447  Web Document Conformance Checker (BETA)< Line 904  Web Document Conformance Checker (BETA)<
904    
905            <p>Any inline-level content must be put            <p>Any inline-level content must be put
906            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
907        <dt>If the element with the error is a block-level element,        <dt>If it is a block-level elements, such as <code>aside</code>,
908        such as <code>div</code>, <code>h<var>n</var></code>, or        <code>div</code>, <code>h<var>n</var></code>,
909        <code>section</code></dt>        <code>p</code>, or <code>section</code></dt>
910            <dd><p>Though some elements such as <code>div</code>,            <dd><dl class="switch">
911            <code>li</code>, and <code>td</code> allow                <dt>If the parent element is <code>div</code>,
912            <em>either one</em> of block-level or inline-level content                <code>li</code>, <code>td</code>, or <code>th</code></dt>
913            is allowed.  If there is a block-level content,                <!-- @@ TODO: more... -->
914            any inline-level content must be put                    <!-- @@ TODO: <p><ul><li><p> -->
915            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <dd><p>The parent element allows <em>either</em>
916                      block-level or inline-level content.  If there is a
917                      block-level content, any inline-level content must be
918                      put in e.g. paragraph element such as <code>p</code>.</p>
919                      <p>For example, an HTML document fragment
920                      <code class="html bad example">&lt;div&gt;&lt;p&gt;Hello!&lt;/p&gt; World!&lt;/div&gt;</code>
921                      is non-conforming, since a word <q>World!</q> does not belong
922                      to any paragraph.  (If not part of any paragraph, what is
923                      it!?)  A conforming example would be:
924                        <pre class="html example">
925    <code>&lt;div&gt;&lt;p&gt;Hello!&lt;/p&gt; &lt;p&gt;World!&lt;/p&gt;&lt;/div&gt;</code></pre>
926                      </p></dd>
927                  <dt>If the parent element does <em>not</em> allow
928                  block-level elements as content</dt>
929                      <dd>The element is not allowed to be inserted here.
930                      For example, a <code>div</code> element cannot be
931                      a child of an <code>h1</code> element.</dd>
932              </dl></dd>
933        <dt>If the element with the error is a <code>noscript</code> element</dt>        <dt>If the element with the error is a <code>noscript</code> element</dt>
934            <dd>The <code>noscript</code> element is allowed only in the context            <dd>The <code>noscript</code> element is allowed only in the context
935            where a block-level or inline-level content is expected            where a block-level or inline-level content is expected
936            and in the <code>head</code> element.            and in the <code>head</code> element.
937            It cannot be used in e.g. <code>ul</code>, <code>table</code>,            It cannot be used in e.g. <code>ul</code>, <code>table</code>,
938            or <code>select</code>.</dd>            or <code>select</code>.</dd>
939        <dt>If the element with the error is the <code>html</code> element        <dt>If the element with the error is <code>blink</code>,
940        that is the root element of an XHTML document</dt>        <code>center</code>, or <code>marquee</code> element</dt>
941            <dd><p>In an XHTML document, the root <code>html</code>            <dd>These elements are not part of the HTML standard.
942            element must have an <code>xmlns</code> attribute            Use CSS for styling control.</dd>
943            whose value is set to  
944            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>        <dt><code>button</code>, <code>datalist</code>,
945          <code>fieldset</code>, <code>form</code>,
946          <code>input</code>, <code>label</code>,
947          <code>optgroup</code>, <code>option</code>, <code>output</code>,
948          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
949          <code>textarea</code>, or <code>textarea</code> element</dt>
950          <!-- rbc, rtc ? -->
951              <dd>These elements are intentionally not supported by the conformance
952              checker <em>yet</em>.</dd>
953        </dl>        </dl>
954      </p>      </p>
955    </div>    </div>
956    
957  <div class="section content-model-error" id="ps-element-missing"><h3>There is no <code><var>$0</var></code>  <div class="section " id="element-not-allowed:area"><h3>An <code>area</code> element cannot be used
958      outside of a <code>map</code> element.</h3></div>
959    
960    <div class="section " id="element-not-allowed:base"><h3>There is another <code>base</code>
961      element.</h3></div>
962    
963    <div class="section " id="element-not-allowed:datatemplate"><h3>In a <code>datatemplate</code> element, only
964      <code>rule</code> elements are allowed.</h3></div>
965    
966    <div class="section " id="element-not-allowed:details-legend"><h3>In a <code>details</code> element, only at the
967      beginning of the element a <code>lengend</code> element
968      may be used.</h3></div>
969    
970    <div class="section " id="element-not-allowed:empty"><h3>Elements are not allowed in an empty
971      element.</h3></div>
972    
973    <div class="section " id="element-not-allowed:figure-legend"><h3>In a <code>figure</code> element, only at the
974      beginning or only at the end of the element a <code>lengend</code> element
975      may be used.</h3></div>
976    
977    <div class="section " id="element-not-allowed:flow"><h3>This element is not allowed where flow
978      content is expected.</h3></div>
979    
980    <div class="section " id="element-not-allowed:flow-style"><h3>A <code>style</code> element without
981      <code>scoped</code> attribute is not allowed in this context.</h3></div>
982    
983    <div class="section " id="element-not-allowed:head-noscript"><h3>This element is not allowed in a
984      <code>noscript</code> element in the <code>head</code> element.</h3></div>
985    
986    <div class="section " id="element-not-allowed:head-style"><h3>A <code>style</code> element with
987      <code>scoped</code> attribute is not allowed in the <code>head</code>
988      element.</h3></div>
989    
990    <div class="section " id="element-not-allowed:head-title"><h3>There is another <code>title</code>
991      element.</h3></div>
992    
993    <div class="section " id="element-not-allowed:minus"><h3>This element is not allowed in this
994      context.</h3></div>
995    
996    <div class="section " id="element-not-allowed:meta-charset"><h3>The character encoding declaration must be the
997      first element in the <code>head</code> element.</h3></div>
998    
999    <div class="section " id="element-not-allowed:metadata"><h3>This element is not allowed where metadata
1000      content is expected.</h3></div>
1001    
1002    <div class="section " id="element-not-allowed:phrasing"><h3>This element is not allowed where phrasing
1003      content is expected.</h3></div>
1004    
1005    <div class="section " id="element-not-allowed:root"><h3>This element is not allowed as the root
1006      element of a document.</h3>
1007        <p>An element that is not allowed as the root element
1008        is used as the root element of the document.  The document is
1009        non-conforming, as far as the conformance checker can tell.</p>
1010    
1011        <dl class="switch">
1012        <dt><code>html</code> element in an XHTML document</dt>
1013            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
1014            element must have an <code>xmlns</code> attribute as:
1015              <pre class="xml example">
1016    <code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;</code></pre></p></dd>
1017        <dt><code>rss</code> element</dt>
1018            <dd><p>The document is written in some version of RSS.</p>
1019            <p>The conformance checker does not support any version
1020            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
1021        <dt><code>feed</code> element</dt>
1022            <dd><p>The Atom <code>feed</code> element must be
1023            in the <code>http://www.w3.org/2005/Atom</code>
1024            namespace as:
1025              <pre class="xml example">
1026    <code>&lt;feed xmlns="http://www.w3.org/2005/Atom"&gt;</code></pre>
1027            </p>
1028            <p>The conformance checker does not support Atom 0.3.
1029            Use Atom 1.0 for feed documents.</p></dd>
1030        </dl>
1031      </div>
1032    
1033    <div class="section " id="element-not-allowed:root:xml"><h3>This element is not allowed as the root element
1034      of an XML document.</h3></div>
1035    
1036    <div class="section " id="element-not-allowed:ruby-base"><h3>This element is not allowed in the <code>ruby</code>
1037      element.</h3></div>
1038    
1039    <div class="section " id="element-not-allowed:text"><h3>This element is not allowed in this
1040      context.</h3></div>
1041    
1042    <div class="section " id="element-not-allowed:atom|content"><h3>This element is not allowed in an Atom
1043      <code>content</code> element.</h3></div>
1044    
1045    <div class="section " id="element-not-allowed:atom|PersonConstruct"><h3>This element is not allowed in Person
1046      construct.</h3></div>
1047    
1048    <div class="section " id="element-not-allowed:atom|TextConstruct"><h3>This element is not allowed in Text
1049      construct.</h3></div>
1050    
1051    <div class="section " id="element-not-defined"><h3>This element is not defined.</h3></div>
1052    
1053    <div class="section " id="no-significant-content"><h3>No significant content is contained
1054      in this element.</h3></div>
1055    
1056    <div class="section " id="no-significant-content-before"><h3>There is no significant content
1057      before this element.</h3></div>
1058    
1059    <div class="section " id="no-significant-content-at-the-end"><h3>No significant content is contained
1060      at the end of this element.</h3></div>
1061    
1062    <div class="section " id="ps-element-missing"><h3>There is no <code><var>{text}</var></code>
1063    element before this element.</h3>    element before this element.</h3>
1064      <p>There must be an element before another element, but there      <p>There must be an element before another element, but there
1065      is not.  The document is non-conforming.</p>      is not.  The document is non-conforming.</p>
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1068      before any <code>dd</code> element.</p>      before any <code>dd</code> element.</p>
1069    </div>    </div>
1070    
1071    <div class="section " id="rp:syntax-error"><h3>The content of a <code>rp</code> element must
1072      be a parenthesis.</h3></div>
1073    
1074  </section>  </section>
1075    
1076  <section id="attribute-errors">  <section id="attribute-errors">
1077  <h2>Attribute Errors</h2>  <h2>Attribute Errors</h2>
1078    
1079  <div class="section attribute-error" id="attribute-missing"><h3>Required attribute <code><var>$0</var></code>  <div class="section " id="attribute-missing"><h3>Required attribute <code><var>{text}</var></code>
1080    is not specified.</h3>    is not specified.</h3>
1081      <p>A required attribute is not specified.  The document      <p>A required attribute is not specified.  The document
1082      is non-conforming.</p>      is non-conforming.</p>
1083    
1084      <p>Some attribute is defined as <i>required</i>.      <p>Some attribute is defined as <i>required</i>.
     For example, any <code>img</code> element must have  
     <code>alt</code> and <code>src</code> attributes specified.  
1085      Without required attributes specified, user agents      Without required attributes specified, user agents
1086      cannot provide the full functionality of the element      cannot provide full functionality of the element to the user.</p>
1087      to the user.</p>  
1088        <dl class="switch">
1089        <dt>HTML <code>img</code> element</dt>
1090            <dd>The <code>src</code> attribute must be specified.
1091            Additionally, the <code>alt</code> attribute must be specified
1092            in many cases.</dd>
1093        <dt>HTML <code>link</code> element</dt>
1094            <dd>The <code>rel</code> attribute must be specified.
1095            Note that the <code>rev</code> attribute is obsolete.</dd>
1096        </dl>
1097    </div>    </div>
1098    
1099    <div class="section " id="attribute-missing:data|type"><h3>For an <code>object</code> at least one of
1100      <code>data</code> and <code>type</code> attributes must be
1101      specified.</h3></div>
1102    
1103    <div class="section " id="attribute-missing:href|target"><h3>For a <code>base</code> element, at least one of
1104      <code>href</code> and <code>target</code> attributes must be
1105      specified.</h3></div>
1106    
1107    <div class="section " id="attribute-missing:name|http-equiv"><h3>For a <code>meta</code> element with the
1108      <code>content</code> attribute specified, exactly one of
1109      <code>name</code> and <code>http-equiv</code> attributes must be
1110      specified.</h3></div>
1111    
1112    <div class="section " id="attribute-missing:name|http-equiv|charset"><h3>For a <code>meta</code> element, exactly one of
1113      <code>name</code>, <code>http-equiv</code>, and <code>charset</code>
1114      attributes must be specified.</h3></div>
1115    
1116    <div class="section " id="attribute-not-allowed"><h3>Attribute
1117      <code><var>{local-name}</var></code> is not allowed for
1118      <code><var>{element-local-name}</var></code> element.</h3>
1119        <p>An attribute is specified where it is not allowed.
1120        The document is non-conforming.</p>
1121    
1122        <dl>
1123        <dt>HTML <code>meta</code> element</dt>
1124            <dd>For HTML <code>meta</code> element, <em>only one</em> of
1125            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
1126            attribute is allowed.</dd>
1127        </dl>
1128      </div>
1129    
1130    <div class="section " id="attribute-not-allowed:ismap"><h3>The <code>ismap</code> attribute may only be
1131      used for the image contained in an <code>a</code> element.</h3></div>
1132    
1133    <div class="section " id="attribute-not-defined"><h3>This attribute is not defined.</h3></div>
1134    
1135  <div class="section attribute-error" id="in-HTML:xml:lang"><h3>The <code>xml:lang</code> attribute is not  <div class="section attribute-error" id="in-HTML:xml:lang"><h3>The <code>xml:lang</code> attribute is not
1136    allowed in HTML document.</h3>    allowed in HTML document.</h3>
1137      <p>The <code>xml:lang</code> attribute is not allowed in      <p>The <code>xml:lang</code> attribute is not allowed in
1138      HTML document.  The document is non-conforming.</p>      HTML document.  The document is non-conforming.</p>
1139    
1140      <p>The <code>lang</code> attribute in the <code>null</code>      <p>Use of the <code>xml:lang</code> attribute is conforming
1141      namespace for HTML elements is defined as conforming <em>only</em> for      <em>only</em> in XML documents.</p>
     XML document.</p>  
1142    
1143      <p>To specify natural language information in HTML document,      <p>To specify natural language information in HTML document,
1144      use <code>lang</code> attribute instead.</p>      use <code>lang</code> attribute instead.</p>
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1153           from an HTML document? -->           from an HTML document? -->
1154    </div>    </div>
1155    
1156  <div class="section attribute-error" id="in-XML:charset"><h3>The <code>charset</code> attribute is not  <div class="section " id="in-XML:charset"><h3>The <code>charset</code> attribute is not
1157    allowed in XML document.</h3>    allowed in XML document.</h3>
1158      <p>The <code>charset</code> attribute of a      <p>The <code>charset</code> attribute of a
1159      <code>meta</code> element is not allowed in XML document.      <code>meta</code> element is not allowed in XML document.
# Line 530  Web Document Conformance Checker (BETA)< Line 1162  Web Document Conformance Checker (BETA)<
1162      <p>To specify the character encoding used for serialization,      <p>To specify the character encoding used for serialization,
1163      if necessary, use XML declaration instead:      if necessary, use XML declaration instead:
1164        <pre class="xml example">        <pre class="xml example">
1165  <code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;<var>encoding-name</var>&quot;?&gt;</code></pre>  <code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?&gt;</code></pre>
1166      </p>      </p>
1167    </div>    </div>
1168    
1169  <div class="section attribute-error" id="in-XML:lang"><h3>The <code>lang</code> attribute is not  <div class="section " id="in-XML:lang"><h3>The <code>lang</code> attribute is not
1170    allowed in XML document.</h3>    allowed in XML document.</h3>
1171      <p>The HTML <code>lang</code> attribute is not allowed in      <p>The HTML <code>lang</code> attribute is not allowed in
1172      XML document.  The document is non-conforming.</p>      XML document.  The document is non-conforming.</p>
1173    
1174      <p>The <code>lang</code> attribute in <code>null</code>      <p>The <code>lang</code> attribute in <code>null</code>
1175      namespace for HTML elements is defined as conforming <em>only</em> for      namespace for HTML elements is conforming <em>only</em> in
1176      HTML document.</p>      HTML documents.</p>
1177    
1178      <p>To specify natural language information in XML document,      <p>To specify natural language information in XML document,
1179      use <code>xml:lang</code> attribute instead.</p>      use <code>xml:lang</code> attribute instead.</p>
1180    </div>    </div>
1181    
1182  <div class="section attribute-error" id="in-XML:xmlns"><h3>The <code>xmlns</code> attribute  <div class="section " id="in-XML:noscript"><h3>A <code>noscript</code> element cannot be
1183      used in XML document.</h3></div>
1184    
1185    <div class="section " id="in-XML:xmlns"><h3>The <code>xmlns</code> attribute
1186    in the <code>null</code> namespace is not allowed in    in the <code>null</code> namespace is not allowed in
1187    XHTML document.  The document is non-conforming.</h3>    XHTML document.  The document is non-conforming.</h3>
1188      <p>The <code>xmlns</code> attribute in the <code>null</code>      <p>The <code>xmlns</code> attribute in the <code>null</code>
1189      namespace is not allowed in XHTML document.</p>      namespace is not allowed in XHTML document.</p>
1190    
1191      <p>This error should not occur in conformance-checking      <p>This error should not occur in conformance-checking of
1192      static documents.</p>      static documents.</p>
1193    </div>    </div>
1194    
# Line 562  Web Document Conformance Checker (BETA)< Line 1197  Web Document Conformance Checker (BETA)<
1197  <section id="attribute-value-errors">  <section id="attribute-value-errors">
1198  <h2>Attribute Value Errors</h2>  <h2>Attribute Value Errors</h2>
1199    
1200  <div class="section attribute-value-error" id="enumerated:invalid"><h3>This attribute only allow a limited set of  <div class="section " id="boolean:invalid"><h3>Attribute value <code><var>{@}</var></code>
1201      is not allowed.  It must be an empty string or a string
1202      <code><var>{local-name}</var></code>.</h3></div>
1203    
1204    <div class="section " id="char:syntax-error"><h3>The attribute value must be exactly one
1205      character.</h3></div>
1206    
1207    <div class="section " id="charref-in-charset"><h3>A character reference cannot be used to
1208      represent a character encoding name.</h3></div>
1209    
1210    <div class="section " id="charset:not-preferred"><h3>Character encoding name
1211      <code><var>{value}</var></code> is not the preferred name of that
1212      character encoding.</h3></div>
1213    
1214    <div class="section " id="charset:not-registered"><h3>Character encoding name
1215      <code><var>{value}</var></code> is not a registered name.</h3>
1216        <p>The specified character encoding name is not registered to
1217        <abbr>IANA</abbr>.  Use of registered character encoding name
1218        is a good practice to facilitate interoperability.</p>
1219    
1220        <dl class="switch">
1221        <dt><code>EUC-TW</code></dt>
1222          <dd><code>EUC-TW</code> is not registered.  Unfortunately, there
1223          is no registered name for that character encoding.  Use
1224          Big5 encoding with character encoding name <code>Big5</code>
1225          if it is enough to represent the document.</dd>
1226        <dt><code>ISO-2022-JP-1</code></dt>
1227          <dd><code>ISO-2022-JP-1</code> is not registered, nevertheless
1228          this character encoding name is documented in
1229          <a href="urn:ietf:rfc:2237"><abbr>RFC</abbr> 2237</a>.  Use
1230          <code>ISO-2022-JP-2</code> instead, since that character encoding
1231          is a superset of ISO-2022-JP-1.</dd>
1232        <dt><code>ISO-2022-JP-3</code>, <code>ISO-2022-JP-3-plane1</code></dt>
1233          <dd>These names are not registered and obsoleted in favor of
1234          <code>ISO-2022-JP-2004</code> and
1235          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1236        <dt><code>ISO-2022-JP-2003</code>,
1237        <code>ISO-2022-JP-2003-plane1</code></dt>
1238          <dd>These names are not registered and corrected to
1239          <code>ISO-2022-JP-2004</code> and
1240          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1241        <dt><code>ISO-2022-JP-2004</code>,
1242        <code>ISO-2022-JP-2004-plane1</code></dt>
1243          <dd>These names are not registered.  Unfortunately, there is
1244          no registered name for these character encodings.</dd>
1245        <dt><code>UTF-8N</code></dt>
1246          <dd><code>UTF-8N</code> is not registered.  Character encoding
1247          name <code>UTF-8</code> represents UTF-8 encoding with or
1248          without <abbr>BOM</abbr>.</dd>
1249        </dl>
1250    
1251        <p><strong>WARNING</strong>: This error might be raised for
1252        a registered character encoding name, since the character encoding
1253        name database of the conformance checker is not complete yet.</p>
1254      </div>
1255    
1256    <div class="section " id="charset:private"><h3>Character encoding name
1257      <code><var>{value}</var></code> is a private name.</h3>
1258        <p>The specified character encoding name is a private name and
1259        not registered to <abbr>IANA</abbr>.  Use of registered character
1260        encoding name is a good practice to facilitate interoperability.</p>
1261    
1262        <dl class="switch">
1263        <dt><code>x-euc-jp</code></dt>
1264          <dd>Use <code>EUC-JP</code> for the Japanese <abbr>EUC</abbr>
1265          character encoding.</dd>
1266        <dt><code>x-sjis</code></dt>
1267          <dd>Use <code>Shift_JIS</code> for standard Shift encoding scheme of
1268          <abbr>JIS</abbr> coded character set, or <code>Windows-31J</code>
1269          for Microsoft standard character set as implemented by
1270          Microsoft Windows.</dd>
1271        </dl>
1272      </div>
1273    
1274    <div class="section " id="charset:syntax-error"><h3>The specified value <code><var>{value}</var></code>
1275      is syntactically not a character encoding name.</h3>
1276        <p>The attribute value must be a character encoding name.  However,
1277        the specified value is not a character encoding name syntactically.
1278        The document is non‐conforming.</p>
1279        <p>Character encoding name is a string of <abbr>ASCII</abbr>
1280        printable characters, up to 40 characters.</p>
1281      </div>
1282    
1283    <div class="section " id="color:syntax-error"><h3>The specified value is not a color
1284      name or hexadecimal color number.</h3></div>
1285    
1286    <div class="section " id="coords:number-not-3"><h3>The <code>coords</code> attribute have to
1287      contain three (3) numbers (specified:
1288      <code><var>{text}</var></code>).</h3></div>
1289    
1290    <div class="section " id="coords:number-not-4"><h3>The <code>coords</code> attribute have to
1291      contain four (4) numbers (specified:
1292      <code><var>{text}</var></code>).</h3></div>
1293    
1294    <div class="section " id="coords:number-lt-6"><h3>The <code>coords</code> attribute have to
1295      contain more than or equal to six (6) numbers (specified:
1296      <code><var>{text}</var></code>).</h3></div>
1297    
1298    <div class="section " id="coords:number-not-even"><h3>The <code>coords</code> attribute have to
1299      contain even number of numbers (specified:
1300      <code><var>{text}</var></code>).</h3></div>
1301    
1302    <div class="section " id="coords:out-of-range"><h3>The specified value <code><var>{value}</var></code>
1303      is out of range.</h3></div>
1304    
1305    <div class="section " id="coords:syntax-error"><h3>The specified value is not valid.</h3></div>
1306    
1307    <div class="section " id="datetime:bad-year"><h3>Year number is out of range.</h3></div>
1308    
1309    <div class="section " id="datetime:bad-month"><h3>Month number is out of range.</h3></div>
1310    
1311    <div class="section " id="datetime:bad-day"><h3>Day number is out of range.</h3></div>
1312    
1313    <div class="section " id="datetime:bad-hour"><h3>Hour number is out of range.</h3></div>
1314    
1315    <div class="section " id="datetime:bad-minute"><h3>Minute number is out of range.</h3></div>
1316    
1317    <div class="section " id="datetime:bad-second"><h3>Second number is out of range.</h3></div>
1318    
1319    <div class="section " id="datetime:bad-timezone-hour"><h3>Hour number of the timezone component is out of
1320      range.</h3></div>
1321    
1322    <div class="section " id="datetime:bad-timezone-minute"><h3>Minute number of the timezone component is out of
1323      range.</h3></div>
1324    
1325    <div class="section " id="datetime:syntax-error"><h3>The attribute value is not a datetime.</h3></div>
1326    
1327    <div class="section " id="dateortime:syntax-error"><h3>The attribute value is not a date or
1328      time.</h3></div>
1329    
1330    <div class="section " id="enumerated:invalid"><h3>This attribute only allow a limited set of
1331    values and the specified value <code><var>{@}</var></code> is not one    values and the specified value <code><var>{@}</var></code> is not one
1332    of them.</h3></div>    of them.</h3>
1333        <p>For this attribute only several values are allowed and the
1334        value of the attribute is not one of them.  The document
1335        is non-conforming.</p>
1336    
1337        <dl>
1338        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
1339            <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
1340            are allowed.</p>
1341            <p>Value <code>Content-Type</code> is obsolete; for charset
1342            declaration, the <code>charset</code> attribute can be used as:
1343            <pre class="html example">
1344    <code>&lt;meta charset="<var>charset-name</var>"&gt;</code></pre>
1345            ... where <var>charset-name</var> is a name of the character encoding
1346            of the document, such as <code>utf-8</code>.</p>
1347            <p>Values <code>Content-Style-Type</code> and
1348            <code>Content-Script-Type</code> are currently not allowed.</p>
1349            <p>Value <code>Keywords</code> is not allowed.  Use
1350            <code>name</code> attribute instead of <code>http-equiv</code>
1351            attribute.</p>
1352            <p>Values <code>Expires</code>, <code>Pragma</code>,
1353            and <code>Cache-Control</code> are not allowed;
1354            use <em>real</em> HTTP header fields for cache control.</p></dd>
1355        </dl>
1356      </div>
1357    
1358    <div class="section attribute-value-error" id="enumerated:invalid:http-equiv:content-type"><h3>Character encoding declaration syntax
1359      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"&gt;</code>
1360      is obsolete.</h3>
1361        <p>Old long character encoding declaration syntax
1362        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"&gt;</code>
1363        is in use.  The document is non‐conforming.</p>
1364    
1365        <p>The new character encoding declaration syntax is:
1366          <pre class="html example">
1367    <code>&lt;meta charset="<var>charset-name</var>"&gt;</code></pre>
1368        </p>
1369      </div>
1370    
1371    <div class="section " id="enumerated:non-conforming"><h3>Attribute value <code><var>{@}</var></code>
1372      is not allowed.</h3></div>
1373    
1374    <div class="section " id="duplicate-http-equiv"><h3>There is another pragma
1375      <code><var>{value}</var></code>.</h3></div>
1376    
1377  <div class="section attribute-value-error" id="duplicate-ID"><h3>This identifier has already been  <div class="section attribute-value-error" id="duplicate-ID"><h3>This identifier has already been
1378    assigned to another element.</h3></div>    assigned to another element.</h3></div>
1379    
1380  <div class="section attribute-value-error" id="link-type:bad-context"><h3>The link type <code><var>$0</var></code>  <div class="section " id="duplicate-token"><h3>The token <code><var>{value}</var></code>
1381      appears in the attribute value twice.</h3></div>
1382    
1383    <div class="section " id="empty-attribute-value"><h3>The attribute value must not be empty.</h3></div>
1384    
1385    <div class="section " id="float:out-of-range"><h3>The specified value is out of range.</h3></div>
1386    
1387    <div class="section " id="float:syntax-error"><h3>The attribute value is not a real
1388      number.</h3></div>
1389    
1390    <div class="section " id="fragment-points-itself"><h3>A fragment identifier references the element
1391      itself.</h3></div>
1392    
1393    <div class="section " id="fragment-points-nothing"><h3>A fragment identifier references no
1394      node.</h3></div>
1395    
1396    <div class="section " id="hashref:syntax-error"><h3>A hash−name reference must start with a
1397      <code>#</code> character.</h3></div>
1398    
1399    <div class="section " id="id-ne-name"><h3>The <code>id</code> attribute value is
1400      different from the <code>name</code> attribute value.</h3></div>
1401    
1402    <div class="section " id="integer:syntax-error"><h3>The attribute value is not an integer.</h3></div>
1403    
1404    <div class="section " id="link-type:bad-context"><h3>The link type <code><var>{value}</var></code>
1405    cannot be specified for this element.</h3>    cannot be specified for this element.</h3>
1406      <p>The specified link type cannot be used for the element.      <p>The specified link type cannot be used for the element.
1407      The document is non-conforming.</p>      The document is non-conforming.</p>
# Line 582  Web Document Conformance Checker (BETA)< Line 1414  Web Document Conformance Checker (BETA)<
1414      while it cannot be used with <code>link</code> element.</p>      while it cannot be used with <code>link</code> element.</p>
1415    </div>    </div>
1416    
1417  <div class="section attribute-value-error" id="link-type:non-conforming"><h3>The link type <code><var>$0</var></code>  <div class="section attribute-value-error" id="invalid-attribute-value"><h3>Attribute value <code><var>{@}</var></code>
1418      is not an allowed value.</h3></div>
1419    
1420    <div class="section " id="length:syntax-error"><h3>The attribute value is not a length
1421      value.</h3></div>
1422    
1423    <div class="section " id="link-type:non-conforming"><h3>The link type <code><var>{value}</var></code>
1424    is non-conforming.</h3>    is non-conforming.</h3>
1425      <p>The specified link type is non-conforming, and therefore      <p>The specified link type is non-conforming, and therefore
1426      the document is non-conforming.</p>      the document is non-conforming.</p>
1427    
1428      <dl>      <dl class="switch">
1429      <dt>Link type <code>contents</code></dt>      <dt>Link type <code>contents</code></dt>
1430        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1431      <dt>Link type <code>copyright</code></dt>      <dt>Link type <code>copyright</code></dt>
1432        <dd>Use link type <code>license</code>.</dd>        <dd>Use link type <code>license</code>.</dd>
1433      <dt>Link type <code>home</code></dt>      <dt>Link type <code>home</code></dt>
1434        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1435        <dt>Link type <code>previous</code></dt>
1436          <dd>Use link type <code>prev</code>.</dd>
1437      <dt>Link type <code>start</code></dt>      <dt>Link type <code>start</code></dt>
1438        <dd>Use link type <code>first</code>.</dd>        <dd>Use link type <code>first</code>.</dd>
1439      <dt>Link type <code>toc</code></dt>      <dt>Link type <code>toc</code> or <code>top</code></dt>
1440        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1441      </dl>      </dl>
1442    </div>    </div>
1443    
1444    <div class="section " id="meta-content-type-syntax-error"><h3>The specified value is not a valid as a long
1445      character encoding declaration.</h3></div>
1446    
1447    <div class="section " id="mismatched-charset-name"><h3>The specified character encoding name
1448      <code><var>{value}</var></code> is different from the actual document
1449      character encoding <code><var>{text}</var></code>.</h3>
1450        <p>The specified character encoding name is different from
1451        the character encoding of the document.  The document
1452        is non‐conforming.</p>
1453      </div>
1454    
1455    <div class="section " id="mismatched-charset-name-not-checked"><h3>Whether the specified character encoding name
1456      <code><var>{value}</var></code> matches to the actual character encoding
1457      name cannot be checked since the input is not a byte stream.</h3></div>
1458    
1459    <div class="section " id="mode:syntax-error"><h3>The attribute value is not a valid mode
1460      name.</h3></div>
1461    
1462    <div class="section " id="nninteger:out-of-range"><h3>The specified value is out of range.</h3></div>
1463    
1464    <div class="section " id="nninteger:syntax-error"><h3>The attribute value is not a non‐negative
1465      integer.</h3></div>
1466    
1467    <div class="section " id="no-referenced-map"><h3>The <code>usemap</code> attribute references
1468      no image map.</h3></div>
1469    
1470    <div class="section " id="no-referenced-menu"><h3>The <code>contextmenu</code> attribute references
1471      no menu.</h3></div>
1472    
1473    <div class="section " id="no-referenced-header-cell"><h3>There is no table header cell whose <code>id</code>
1474      is <code><var>{value}</var></code> in the same table.</h3></div>
1475    
1476    <div class="section " id="refresh:syntax-error"><h3>the specified value is not a valid as part
1477      of a <code>Refresh</code> pragma.</h3></div>
1478    
1479    <div class="section " id="repeat:syntax-error"><h3>The attribute value is not an integer or
1480      a string <code>template</code>.</h3></div>
1481    
1482  <div class="section attribute-value-error" id="reserved-browsing-context-name"><h3>Browsing context name  <div class="section attribute-value-error" id="reserved-browsing-context-name"><h3>Browsing context name
1483    <code><var>{@}</var></code> is reserved.</h3>    <code><var>{@}</var></code> is reserved.</h3>
1484      <p>The specified browsing context name is reserved.      <p>The specified browsing context name is reserved.
# Line 617  Web Document Conformance Checker (BETA)< Line 1495  Web Document Conformance Checker (BETA)<
1495      However, they are <em>not</em> conforming attribute values.</p>      However, they are <em>not</em> conforming attribute values.</p>
1496    </div>    </div>
1497    
1498  </section>  <div class="section " id="Reserved-Prefixes-and-Namespace-Names:Name"><h3>Namespace name <code><var>{text}</var></code>
1499      is reserved and cannot be used for an arbitrary prefix.</h3></div>
1500    
1501  <section id="attribute-value-warnings">  <div class="section " id="Reserved-Prefixes-and-Namespace-Names:Prefix"><h3>Namespace prefix <code><var>{text}</var></code>
1502  <h2>Attribute Value Warnings</h2>    is reserved and cannot be used for an arbitrary namespace name.</h3></div>
1503    
1504  <div class="section attribute-value-warning should" id="s:link-type:proposed"><h3>Link type <code><var>$0</var></code>  <div class="section " id="link-type:proposed"><h3>Link type <code><var>{value}</var></code>
1505    is proposed but not accepted yet; it <em>should not</em> be    is proposed but not accepted yet; it <em>should not</em> be
1506    used until it has been accepted.</h3>    used until it has been accepted.</h3>
1507      <p>The link type is in the <i>proposed</i> status; it      <p>The link type is in the <i>proposed</i> status; it
# Line 631  Web Document Conformance Checker (BETA)< Line 1510  Web Document Conformance Checker (BETA)<
1510    
1511      <p><strong>Warning</strong>: The data served to the      <p><strong>Warning</strong>: The data served to the
1512      conforming checker might be out of date; it might have already      conforming checker might be out of date; it might have already
1513      been accepted or rejected, depending on which the document      been accepted or rejected.  The document might or might not be
1514      might be conforming or non-conforming.  See WHATWG Wiki      conforming depending on the status.  See WHATWG Wiki
1515      for the latest information.</p>      for the latest information.</p>
1516    </div>    </div>
1517    
1518    <div class="section " id="sizes:syntax-error"><h3>The specified value <code><var>{value}</var></code>
1519      is not a valid value.</h3></div>
1520    
1521    <div class="section " id="space-in-ID"><h3>White space characters are not allowed
1522      in the <code>id</code> attribute.</h3></div>
1523    
1524    <div class="section " id="template:not-template"><h3>The node referenced by the <code>template</code>
1525      attribute is not a template.</h3></div>
1526    
1527    <div class="section " id="window-name:empty"><h3>Browsing context name must not be empty.</h3></div>
1528    
1529    <div class="section " id="window-name:reserved"><h3>Browsing context name
1530      <code><var>{value}</var></code> is reserved.</h3></div>
1531    
1532    <div class="section " id="word-not-allowed"><h3>The word <code><var>{value}</var></code> is not
1533      allowed in this attribute.</h3></div>
1534    
1535    <div class="section " id="XML-1.0-NCName:syntax-error"><h3>The specified value is not a legal XML Namespaces
1536      1.0 <code>NCName</code>.</h3></div>
1537    
1538  </section>  </section>
1539    
1540  <section id="table-model-errors">  <section id="table-model-errors">
1541  <h2>Table Model Errors</h2>  <h2>Table Model Errors</h2>
1542    
1543  <div class="section table-model-error" id="table:colspan-creates-column-with-no-anchored-cell"><h3>This <code>colspan</code> attribute  <div class="section " id="cell-overlapping"><h3>Cell slot (<var>{text}</var>) is filled by
1544      multiple cells.</h3></div>
1545    
1546    <div class="section " id="colspan-creates-column-with-no-anchored-cell"><h3>This <code>colspan</code> attribute
1547    results in creating a table column that does not contain    results in creating a table column that does not contain
1548    any cell anchored to it.</h3></div>    any cell anchored to it.</h3></div>
1549    
1550    <div class="section " id="column-with-no-anchored-cell"><h3>This column has no anchored cell.</h3></div>
1551    
1552  <div class="section table-model-error" id="table:no-cell-in-last-row"><h3>The table has no cell (<code>td</code> or  <div class="section table-model-error" id="table:no-cell-in-last-row"><h3>The table has no cell (<code>td</code> or
1553    <code>th</code>) in the last row.</h3></div>    <code>th</code>) in the last row.</h3></div>
1554    
# Line 657  Web Document Conformance Checker (BETA)< Line 1561  Web Document Conformance Checker (BETA)<
1561      The document is non-conforming.</p>      The document is non-conforming.</p>
1562    
1563      <p>For example, the table below is non-conforming:      <p>For example, the table below is non-conforming:
1564        <pre class="html non-conforming example">        <pre class="html bad example">
1565  <code>&lt;table&gt;  <code>&lt;table&gt;
1566  &lt;tbody&gt;  &lt;tbody&gt;
1567  &lt;tr&gt;&lt;td rowspan=2&gt;&lt;/td&gt;&lt;/tr&gt;  &lt;tr&gt;&lt;td rowspan=2&gt;&lt;/td&gt;&lt;/tr&gt;
1568  &lt;/tbody&gt;  &lt;/tbody&gt;
1569  &lt;/table&gt;</code></pre>  &lt;/table&gt;</code></pre>
1570      ... is non-conforming, since the second row contains only      ... since the second row contains only
1571      a cell that spans the first and the second rows.</p>      a cell that spans between first and second rows.</p>
1572    </div>    </div>
1573    
1574    <div class="section " id="row-with-no-anchored-cell"><h3>This row has no anchored cell.</h3></div>
1575    
1576    <div class="section " id="rowspan-creates-row-with-no-anchored-cell"><h3>This <code>rowspan</code> attribute
1577      results in creating a table row that does not contain
1578      any cell anchored to it.</h3></div>
1579    
1580    
1581  </section>  </section>
1582    
1583  <section id="imt-warnings">  <section id="imt-warnings">
1584  <h2>Internet Media Type Warnings</h2>  <h2>Internet Media Type Errors</h2>
1585    
1586    <div class="section " id="IMT:composite"><h3>The specified media type is a composite
1587      type, which is not allowed in this context.</h3></div>
1588    
1589    <div class="section " id="IMT:syntax-error"><h3>The specified value is not an Internet Media
1590      Type.</h3></div>
1591    
1592  <div class="section should" id="s:IMT:obsolete-subtype"><h3><code><var>{@}</var></code>: An <em>obsolete</em>  <div class="section should" id="s:IMT:obsolete-subtype"><h3><code><var>{@}</var></code>: An <em>obsolete</em>
1593    subtype is used.</h3></div>    subtype is used.</h3></div>
# Line 681  Web Document Conformance Checker (BETA)< Line 1598  Web Document Conformance Checker (BETA)<
1598  <div class="section should" id="s:IMT:unregistered-subtype"><h3><code><var>{@}</var></code>: The subtype is  <div class="section should" id="s:IMT:unregistered-subtype"><h3><code><var>{@}</var></code>: The subtype is
1599    not registered to IANA.</h3></div>    not registered to IANA.</h3></div>
1600    
1601    <div class="section " id="not-IMT"><h3>A value that is not an Internet Media Type
1602      is not allowed here.</h3></div>
1603    
1604  </section>  </section>
1605    
1606  <section id="uri-errors">  <section id="uri-errors">
1607  <h2>URI (or IRI) Errors</h2>  <h2>URL Errors</h2>
1608    
1609  <div class="section must" id="m:URI::syntax-error"><h3>The specified value is syntactically not an IRI  <div class="section " id="syntax-error:iri3987"><h3>The specified value is syntactically not an
1610      IRI.</h3></div>
1611    
1612    <div class="section " id="syntax-error:iriref3987"><h3>The specified value is syntactically not an IRI
1613    reference.</h3>    reference.</h3>
1614      <p>The specified value does not satisfy the syntactical requirements      <p>The specified value does not satisfy the syntactical requirements
1615      for IRI references.  The document is non-conforming.</p>      for IRI references.  The document is non-conforming.</p>
# Line 701  Web Document Conformance Checker (BETA)< Line 1624  Web Document Conformance Checker (BETA)<
1624      </p>      </p>
1625    </div>    </div>
1626    
1627  </section>  <div class="section " id="syntax-error:rdfuriref"><h3>The specified value is syntactically not an RDF
1628      URI reference.</h3></div>
1629    
1630  <section id="uri-warnings">  <div class="section " id="syntax-error:uri2396"><h3>The specified value is syntactically not a
1631  <h2>URI (or IRI) Warnings</h2>    URI according to RFC 2396.</h3></div>
1632    
1633  <div class="section should" id="s:URI::dot-segment"><h3>Dot-segment (<code>.</code> or  <div class="section " id="syntax-error:uri3986"><h3>The specified value is syntactically not a
1634    <code>..</code>) should not occur in an absolute reference.</h3>    URI.</h3></div>
1635    
1636    <div class="section " id="URL:address-format"><h3>URL host address format
1637      <code><var>{value}</var></code> is not supported by the
1638      conformance checker.</h3></div>
1639    
1640    <div class="section " id="URL:default-port"><h3>Default port number should be omitted.</h3></div>
1641    
1642    <div class="section " id="URL:dot-segment"><h3>A dot-segment (<code>.</code> or
1643      <code>..</code>) occurs in an absolute reference.</h3>
1644      <p>Dot-segment (<code>.</code> or <code>..</code>) should      <p>Dot-segment (<code>.</code> or <code>..</code>) should
1645      not occur in an absolute reference.</p>      not occur in an absolute reference.</p>
1646    
# Line 718  Web Document Conformance Checker (BETA)< Line 1651  Web Document Conformance Checker (BETA)<
1651      canonical form before it has been published.</p>      canonical form before it has been published.</p>
1652    </div>    </div>
1653    
1654  <div class="section should" id="s:URI::empty-path"><h3>This IRI should explicitly end with  <div class="section " id="URL:empty-host"><h3>The host component of the URL is empty.</h3></div>
1655    <code>/</code>.</h3></div>  
1656    <div class="section " id="URL:empty-path"><h3>The URL does not end with
1657      a <code>/</code> character.</h3></div>
1658    
1659  <div class="section should" id="s:URI::lowercase-hexadecimal-digit"><h3>Hexadecimal digit in percent-encoding  <div class="section " id="URL:empty-port"><h3>The port component of the URL is empty.</h3></div>
1660    should be in lowercase.</h3>  
1661    <div class="section " id="URL:long-host"><h3>The host component of the URL
1662      is too long.</h3></div>
1663    
1664    <div class="section " id="URL:lowercase-hexadecimal-digit"><h3>A lowercase hexadecimal digit is used
1665      in percent-encoding.</h3>
1666      <p>The hexadecimal digit in percent-encoding string in the IRI      <p>The hexadecimal digit in percent-encoding string in the IRI
1667      is in lowercase.  Though the IRI <em>is</em> conforming,      is in lowercase.  Though the IRI <em>is</em> conforming,
1668      it should be in uppercase.</p>      it should be in uppercase.</p>
1669    </div>    </div>
1670    
1671  <div class="section should" id="s:URI::percent-encoded-unreserved"><h3>An unreserved character is  <div class="section " id="URL:non-DNS-host"><h3>The host component of the URL
1672      is not a DNS host name.</h3></div>
1673    
1674    <div class="section " id="URL:non-UTF-8-host"><h3>The host component of the URL
1675      is not encoded in UTF-8.</h3></div>
1676    
1677    <div class="section " id="URL:password"><h3>Password should not be included in a URL
1678      for the security.</h3></div>
1679    
1680    <div class="section " id="URL:percent-encoded-unreserved"><h3>An unreserved character is
1681    percent-encoded.</h3>    percent-encoded.</h3>
1682      <p>An unreserved character is percent-encoded in the IRI.      <p>An unreserved character is percent-encoded in the IRI.
1683      Though it <em>is</em> conforming, it should be in the      Though it <em>is</em> conforming, it should be in the
1684      decoded (or bare) form.</p>      decoded (or bare) form.</p>
1685    </div>    </div>
1686    
1687  <div class="section should" id="s:URI::uppercase-scheme-name"><h3>URI scheme name is in uppercase.</h3>  <div class="section " id="URL:uppercase-host"><h3>The host <code><var>{value}</var></code>
1688      should be spelt in lowercase.</h3></div>
1689    
1690    <div class="section " id="URL:uppercase-scheme-name"><h3>URL scheme name is in uppercase.</h3>
1691      <p>The scheme part of the IRI is written in uppercase letter.</p>      <p>The scheme part of the IRI is written in uppercase letter.</p>
1692    
1693      <p>Uppercase scheme names are not required to be processed      <p>Uppercase scheme names are not required to be processed
# Line 753  Web Document Conformance Checker (BETA)< Line 1705  Web Document Conformance Checker (BETA)<
1705    
1706  </section>  </section>
1707    
1708    <section id="cache-manifest-errors">
1709    <h2>Cache Manifest Errors</h2>
1710    
1711    <div class="section must" id="m:not-manifest"><h3>This document is not a cache manifest.</h3>
1712        <p>The specified document is <em>not</em> a cache manifest.
1713        The document is non-conforming.</p>
1714    
1715        <p>An entity labeled as Internet media type
1716        <code>text/cache-manifest</code> must contain a cache manifest.</p>
1717    
1718        <p>A cache manifest must start with a line whose content is
1719        <code class="manifest example">CACHE MANIFEST</code>
1720        (exactly one space character between
1721        <code>CACHE</code> and <code>MANIFEST</code>).</p>
1722      </div>
1723    </section>
1724    
1725    <section id="information">
1726    <h2>Stability Information</h2>
1727    
1728    <div class="section " id="deprecated:attr"><h3>This attribute is deprecated.</h3></div>
1729    
1730    <div class="section " id="deprecated:element"><h3>This element is deprecated.</h3></div>
1731    
1732    <div class="section " id="status:cr:element"><h3>This element is in the
1733      <strong>call for implementation</strong> stage.</h3>
1734        <p>The element is in the call for implementation stage.</p>
1735        
1736        <p>Usually, using the element is safe.  However, it is a new feature
1737        so that it might not be implemented correctly.  If it is found that
1738        the feature is hard or impossible to implement, the feature
1739        might be revised, or in some case it might be dropped.</p>
1740    
1741        <p>Elements defined by Atom 1.0 (IETF Proposed Standard), and XBL 2.0
1742        (W3C Candidate Recommendation) belong to this class.</p>
1743      </div>
1744    
1745    <div class="section " id="status:lc:element"><h3>This element is in the <strong>last
1746      call for comments</strong> stage.</h3>
1747        <p>The element is in the last call for comments stage.</p>
1748        
1749        <p>The element is relatively mature, though the standardization
1750        is not done yet.  It may be used for experiments.  Since it is a new
1751        feature, it might not be implemented correctly or at all.  If it is
1752        found that the feature is hard or impossible to implement, the feature
1753        might be revised or might be dropped.</p>
1754    
1755        <p>Elements defined by Web Forms 2.0 as well as some elements
1756        defined by HTML5 belong to this class.</p>
1757      </div>
1758    
1759    <div class="section " id="status:wd:element"><h3>This element is documented in a <strong>working
1760      draft</strong>.</h3>
1761        <p>The element is documented in a working or editor's draft
1762        and not yet completed.</p>
1763        
1764        <p>The element should not be used for any practical purpose.
1765        The feature might be drastically changed later or might be
1766        entirely removed.</p>
1767    
1768        <p>Most of new elements defined by HTML5 belong to this class.</p>
1769      </div>
1770    
1771    <div class="section " id="status:non-standard:element"><h3>This element is <strong>not part of any
1772      standard</strong> the conformance checker knows.</h3>
1773        <p>The element is not part of any standard or draft the conformance
1774        checker is aware of.</p>
1775        
1776        <p>The element should not be used for any practical purpose unless
1777        there is really a standard that defines the element.</p>
1778      </div>
1779    
1780    <div class="section " id="status:cr:attr"><h3>This attribute is in the
1781      <strong>call for implementation</strong> stage.</h3>
1782        <p>The attribute is in the call for implementation stage.</p>
1783        
1784        <p>Usually, using the attribute is safe.  However, it is a new feature
1785        so that it might not be implemented correctly.  If it is found that
1786        the feature is hard or impossible to implement, the feature
1787        might be revised, or in some case it might be dropped.</p>
1788      </div>
1789    
1790    <div class="section " id="status:lc:attr"><h3>This attribute is in the <strong>last
1791      call for comments</strong> stage.</h3>
1792        <p>The attribute is in the last call for comments stage.</p>
1793        
1794        <p>The attribute is relatively mature, though the standardization
1795        is not done yet.  It may be used for experiments.  Since it is a new
1796        feature, it might not be implemented correctly or at all.  If it is
1797        found that the feature is hard or impossible to implement, the feature
1798        might be revised or might be dropped.</p>
1799      </div>
1800    
1801    <div class="section " id="status:wd:attr"><h3>This attribute is documented in a <strong>working
1802      draft</strong>.</h3>
1803        <p>The attribute is documented in a working or editor's draft
1804        and not yet completed.</p>
1805        
1806        <p>The attribute should not be used for any practical purpose.
1807        The feature might be drastically changed later or might be
1808        entirely removed.</p>
1809      </div>
1810    
1811    <div class="section " id="status:non-standard:attr"><h3>This attribute is <strong>not part of any
1812      standard</strong> the conformance checker knows.</h3>
1813        <p>The attribute is not part of any standard or draft the conformance
1814        checker is aware of.</p>
1815        
1816        <p>The attribute should not be used for any practical purpose unless
1817        there is really a standard that defines the attribute.</p>
1818      </div>
1819    </section>
1820    
1821    <section id="langtag-errors">
1822    <h2>Language Tag Errors</h2>
1823    
1824    <div class="section " id="langtag:extension:duplication"><h3>There is another extension subtag
1825      <code><var>{value}</var></code>.</h3></div>
1826    
1827    <div class="section " id="langtag:illegal"><h3>Subtag <code><var>{value}</var></code> is
1828      syntactically invalid.</h3></div>
1829    
1830    <div class="section " id="langtag:language:case"><h3>It is a good practice to represent ISO 639-1
1831      language code <code><var>{value}</var></code> in lowercase.</h3></div>
1832    
1833    <div class="section " id="langtag:language:mul"><h3>Langauge tag <code>mul</code> should not be
1834      used.</h3></div>
1835    
1836    <div class="section " id="langtag:language:nosemantics"><h3>No semantics is defined for language subtag
1837      <code><var>{value}</var></code>.</h3></div>
1838    
1839    <div class="section " id="langtag:language:syntax"><h3>The language subtag <code><var>{value}</var></code>
1840      is syntactically invalid.</h3></div>
1841    
1842    <div class="section " id="langtag:language:und"><h3>Langauge tag <code>und</code> should not be
1843      used.</h3></div>
1844    
1845    <div class="section " id="langtag:private"><h3>It would be better if a private use language
1846      tag (<code><var>{value}</var></code>) is not used.</h3></div>
1847    
1848    <div class="section " id="langtag:privateuse:syntax"><h3>Private use subtag <code><var>{value}</var></code>
1849      is syntactically invalid.</h3></div>
1850    
1851    <div class="section " id="langtag:region:case"><h3>It is a good practice to represent ISO 3166
1852      country code <code><var>{value}</var></code> in uppercase.</h3></div>
1853    
1854    <div class="section " id="langtag:region:nosemantics"><h3>No semantics is defined for region subtag
1855      <code><var>{value}</var></code>.</h3></div>
1856    
1857    <div class="section " id="langtag:region:private"><h3>Use of private use country code
1858      <code><var>{value}</var></code> is not allowed.</h3></div>
1859    
1860    </section>
1861    
1862    <section id="rdfxml-errors">
1863    <h2>RDF/XML Errors</h2>
1864    
1865    <div class="section " id="bad-rdf-namespace"><h3>The namespace URI of an element that
1866      represents an RDF concept must be
1867      <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#</code>.</h3></div>
1868    
1869    <div class="section " id="duplicate-rdf-id"><h3>The specified value is already used as an
1870      ID.</h3></div>
1871    
1872    <div class="section " id="duplicate-unqualified-attr"><h3>Both unqualified attribute and namespace‐qualified
1873      RDF attribute are specified, which is not allowed.</h3></div>
1874    
1875    <div class="section " id="parse-type-other"><h3>An invalid value is specified to
1876      the <code>parseType</code> attribute.</h3></div>
1877    
1878    <div class="section " id="second-node-element"><h3>There is another element, such that
1879      this element is not allowed.</h3></div>
1880    
1881    <div class="section " id="unqualified-attr"><h3>Unqualified attribute is not allowed.</h3></div>
1882    
1883    <div class="section " id="unqualified-rdf-attr"><h3>RDF attribute should be
1884      namespace‐qualified.</h3></div>
1885    
1886    </section>
1887    
1888  <section id="unsupported-messages">  <section id="unsupported-messages">
1889  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1890    
1891  <div class="section unsupported" id="unsupported:attribute"><h3>This attribute is not supported by the  <div class="section " id="unknown-element"><h3>Conformance checking for element
1892    conformance checker; <em>it might or might not be conforming</em>.</h3>    <code><var>{local-name}</var></code> is not supported; <em>it might or
1893      <p>The conformant checker does not support the attribute.    might not be conforming</em>.</h3>
1894        <p>The conformant checker does not support the element.
1895      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1896    </div>    </div>
1897    
1898  <div class="section unsupported" id="unsupported:element"><h3>This element is not supported by the  <div class="section " id="unknown-attribute"><h3>Conformance checking for attribute
1899    conformance checker; <em>it might or might not be conforming</em>.</h3>    <code><var>{local-name}</var></code> of element
1900      <p>The conformant checker does not support the element.    <code><var>{element-local-name}</var></code> is not supported;
1901      <em>it might or might not be conforming</em>.</h3>
1902        <p>The conformant checker does not support the attribute.
1903      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1904    </div>    </div>
1905    
1906  <div class="section unsupported" id="unsupported:link-type"><h3>The link type <code><var>$0</var></code> is not  <div class="section " id="unknown-link-type"><h3>Link type <code><var>{value}</var></code> is not
1907    standardized or registered at the time of the release of the conformance    standardized or registered at the time of the release of the conformance
1908    checker; <em>it is non-conforming unless it has now been    checker; <em>it is non-conforming unless it now has been
1909    registered</em>.</h3>    registered</em>.</h3>
1910      <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.
1911      Some common link types are defined in the HTML5 specification.      Some common link types are defined in the HTML5 specification.
# Line 782  Web Document Conformance Checker (BETA)< Line 1917  Web Document Conformance Checker (BETA)<
1917      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1918      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1919      document is non-conforming.</p>      document is non-conforming.</p>
1920    
1921        <dl>
1922        <dt>Link types <code>shortcut icon</code></dt>
1923            <dd>Link type <code>shortcut</code> is not registered.
1924            Use only <code>icon</code> for linking to so-called favicon.</dd>
1925        </dl>
1926    </div>    </div>
1927    
1928  <div class="section unsupported" id="unsupported:event-handler"><h3>Conformance checking for event handler attribute  <div class="section " id="event-handler"><h3>Conformance checking for event handler attribute
1929    is not supported; <em>it might or might not be conforming.</em></h3></div>    is not supported; <em>it might or might not be conforming.</em></h3></div>
1930    
1931  <div class="section unsupported" id="unsupported:language-tag"><h3>Conformance checking for language tag  <div class="section " id="media-query"><h3>Conformance checking for media query
1932    is not supported; <em>it might or might not be conforming.</em></h3></div>    is not supported; <em>it might or might not be conforming.</em></h3></div>
1933    
1934  <div class="section unsupported" id="unsupported:media-query"><h3>Conformance checking for media query  <div class="section " id="addr-spec-not-supported"><h3>Conformance checking for an <code>addr-spec</code>
1935    is not supported; <em>it might or might not be conforming.</em></h3></div>    is not supported; <em>it might or might not be conforming.</em></h3></div>
1936    
1937  <div class="section unsupported" id="unsupported:script"><h3>Conformance checking for script  <div class="section " id="XML-script-lang"><h3>Conformance checking for script
1938    language <code><var>$0</var></code> is not supported;    language <code><var>{text}</var></code> is not supported;
1939    <em>it might or might not be conforming.</em></h3></div>    <em>it might or might not be conforming.</em></h3></div>
1940    
1941  <div class="section unsupported" id="unsupported:style"><h3>Conformance checking for style  <div class="section " id="XML-style-lang"><h3>Conformance checking for style
1942    language <code><var>$0</var></code> is not supported;    language <code><var>{text}</var></code> is not supported;
1943    <em>it might or might not be conforming.</em></h3></div>    <em>it might or might not be conforming.</em></h3></div>
1944    
1945    <div class="section " id="atom|content-not-supported"><h3>Conformance checking for an Atom
1946      <code>content</code> element with <code>type</code>
1947      <code><var>{text}</var></code> is not supported.</h3></div>
1948    
1949  </section>  </section>
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2156    
2157    <section id="levels">
2158    <h2>Error Levels</h2>
2159    
2160    <table id="levels-table">
2161    <thead>
2162    <tr><th scope="col">Level</th>
2163    <th scope="col">Conforming?</th>
2164    <th scope="col">Description</th>
2165    </tr>
2166    </thead>
2167    <tbody>
2168    <tr class="level-m" id="level-m">
2169    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
2170    <td>Non‐conforming.</td>
2171    <td>A violation to a hard requirement of the specification.
2172    The document is non‐conforming.</td>
2173    </tr>
2174    <tr class="level-s" id="level-s">
2175    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
2176    <td>Non‐conforming, but <em>in some case</em>
2177    conforming.</td>
2178    <td>A violation to a requirement of the specification.
2179    The violation might be legitimize in some case.  Otherwise,
2180    the document is non‐conforming.</td>
2181    </tr>
2182    <tr class="level-w" id="level-w">
2183    <th scope="row">Warning</th>
2184    <td>Conforming.</td>
2185    <td>A warning is an advice from the conformance checker to avoid
2186    to solve a problem in a confusing or possibly wrong way.
2187    It does not affect to the conformance of the document, and
2188    may sometimes be inappropriate.</td>
2189    </tr>
2190    <tr class="level-i" id="level-i">
2191    <th scope="row">Information</th>
2192    <td>Conforming.</td>
2193    <td>An informational message just provides an additional information
2194    on the feature used in the document or the status of the retrieval
2195    or so on.
2196    It does not affect to the conformance of the document.</td>
2197    </tr>
2198    <tr class="level-u" id="level-u">
2199    <th scope="row">Not supported</th>
2200    <td><em>Unknown</em>.</td>
2201    <td>Some feature that is not supported by the conformance checker
2202    is used in the document.</td>
2203    </tr>
2204    </tbody>
2205    </table>
2206    </section>
2207    
2208  <section id="license">  <section id="license">
2209  <h2>License of This Document</h2>  <h2>License of This Document</h2>
2210    
2211  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>‐<time>2008</time>
2212  <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>
2213    <code class="mail">&lt;<a href="mailto:[email protected]">[email protected]</a>&gt;</code>.</p>
2214    
2215    <p>This document is free software; you can redistribute it
2216  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
2217  </section>  </section>
2218    
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