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revision 1.8 by wakaba, Sun Sep 2 07:59:01 2007 UTC revision 1.16 by wakaba, Sun Nov 18 11:05:12 2007 UTC
# Line 11  Web Document Conformance Checker (BETA)< Line 11  Web Document Conformance Checker (BETA)<
11  <body>  <body>
12  <h1>Description of Errors</h1>  <h1>Description of Errors</h1>
13    
14    <section id="html5-character-encoding">
15    <h2>HTML5 Character Encoding Errors</h2>
16    
17    <d:item name="character encoding" class="format-charset must" level="m">
18      <d:message xml:lang="en">Character encoding <code><var>$0</var></code>
19      is not allowed for <abbr>HTML</abbr> document.</d:message>
20      <d:desc xml:lang="en">
21        <p>The character encoding used for the document is not allowed
22        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
23      </d:desc>
24    </d:item>
25    
26    <d:item name="character encoding" class="format-charset should"
27        level="s">
28      <d:message xml:lang="en">Character encoding <code><var>$0</var></code>
29      should not be used for <abbr>HTML</abbr> document.</d:message>
30      <d:desc xml:lang="en">
31        <p>The character encoding used for the document is not recommended
32        for <abbr>HTML</abbr> document.  The document is non‐conforming
33        unless there is any good reason to use that encoding.</p>
34      </d:desc>
35    </d:item>
36    
37    <d:item name="character encoding" class="format-charset warning"
38        level="w">
39      <d:message xml:lang="en">Use of UTF-8 is encouraged.</d:message>
40      <d:desc xml:lang="en">
41        <p>Use of UTF-8 as the character encoding of the document is encouraged,
42        though the use of another character encoding is conforming.</p>
43      </d:desc>
44    </d:item>
45    
46    <d:item name="no character encoding declaration" class="format-charset error"
47        level="m">
48      <d:message xml:lang="en">There is no character encoding
49      declaration.</d:message>
50      <d:desc xml:lang="en">
51        <p>The document does not contain a character encoding
52        declaration.  Unless the character encoding is explicitly
53        specified in upper‐level protocol, e.g. in <abbr>HTTP</abbr>,
54        or is implied by <abbr>BOM</abbr>, there must be a character
55        encoding declaration.  The document is non‐conforming.</p>
56    
57        <p>The long character encoding declaration syntax
58        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
59        is obsolete.  The new syntax is:</p>
60        <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></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      </d:desc>
65    </d:item>
66    
67    <d:item name="non ascii superset" class="format-charset error"
68        level="m">
69      <d:message xml:lang="en">No character encoding metadata is found
70      in upper‐level protocol nor is there <abbr>BOM</abbr>, while
71      character encoding <code><var>$0</var></code>
72      is not a superset of <abbr>ASCII</abbr>.</d:message>
73      <d:desc xml:lang="en">
74        <p>The document is not labeled with character encoding name
75        in upper‐level protocol, e.g. in <abbr>HTTP</abbr>, and
76        the document is not begin with <abbr>BOM</abbr>.  In addition,
77        the character encoding of the document is not a superset of
78        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
79    
80        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
81        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
82        as:</p>
83        <pre class="http example"><code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
84    
85        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
86        <code class="html example">&lt;meta charset="<var>charset-name</var>"></code>,
87        does not allow to omit <code>charset</code> parameter
88        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
89        compatible encoding.</p>
90    
91        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
92        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
93        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
94      </d:desc>
95    </d:item>
96    
97    <d:item name="charset label detected" class="format-charset warning"
98        level="w">
99      <d:message xml:lang="en">While parsing the document as
100      <code><var>$0</var></code>, a character encoding declaration specifying
101      character encoding as <code><var>$1</var></code> is found.  The document
102      is reparsed.</d:message>
103      <d:desc xml:lang="en">
104        <p>While parsing a document in a character encoding,
105        a character encoding declaration which declares the character
106        encoding of the document as another character encoding is found.
107        The occurence of this warning itself does not make the document
108        non‐conforming.  However, the failure of the first attempt to
109        to detect the character encoding might be the result of non‐conformance
110        of the document.</p>
111    
112        <p>The document will be reparsed from the beginning.  Some error
113        or warning might be reported again.</p>
114    
115        <p>These are suggestions to avoid this warning:</p>
116        <ul>
117        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
118        field in the <abbr>HTTP</abbr> header, as:
119        <pre class="HTTP example"><code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
120        <li>Put the character encoding declaration
121        (<code class="html example">&lt;meta charset="<var>charset-name</var>"></code>)
122        just after <code class="html example">&lt;head></code> start tag.</li>
123        <li>Use <code>UTF-8</code>.</li>
124        </ul>
125      </d:desc>
126    </d:item>
127    </section>
128    
129  <section id="html5-tokenize-error">  <section id="html5-tokenize-error">
130  <h2>HTML5 Parse Errors in Tokenization Stage</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
131    
# Line 48  Web Document Conformance Checker (BETA)< Line 163  Web Document Conformance Checker (BETA)<
163    <d:message xml:lang="en">The <code>&amp;</code> character must    <d:message xml:lang="en">The <code>&amp;</code> character must
164    introduce a reference.</d:message>    introduce a reference.</d:message>
165    <d:desc xml:lang="en">    <d:desc xml:lang="en">
166      <p>An <code>&amp;</code> (<code>U+0026</code>      <p>An <code>&amp;</code> character which
     <code class="charname">AMPERSAND</code>) character which  
167      is not part of any reference appears in the input stream.      is not part of any reference appears in the input stream.
168      The document is non-conforming.</p>      The document is non‐conforming.</p>
169    
170        <p><em>Any <code>&amp;</code> character in URI (or IRI)
171        must be escaped as <code class="example">&amp;amp;</code>.</em></p>
172    
173      <p>The <code>&amp;</code> character must      <p>The <code>&amp;</code> character must
174      be the first character of a reference:      be the first character of a reference:
175        <dl>        <dl class="switch">
176        <dt>Named entity reference</dt>        <dt>Named entity reference</dt>
177            <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>            <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
178            where <var>entity-name</var> is the name of the            where <var>entity-name</var> is the name of the
# Line 131  Web Document Conformance Checker (BETA)< Line 248  Web Document Conformance Checker (BETA)<
248    
249      <p>The string <code>&amp;#</code> must be the first two characters      <p>The string <code>&amp;#</code> must be the first two characters
250      of a reference:      of a reference:
251        <dl>        <dl class="switch">
252        <dt>Numeric character reference</dt>        <dt>Numeric character reference</dt>
253            <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>            <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
254            where <var>d</var> is the decimal representation of            where <var>d</var> is the decimal representation of
# Line 172  Web Document Conformance Checker (BETA)< Line 289  Web Document Conformance Checker (BETA)<
289    </d:desc>    </d:desc>
290  </d:item>  </d:item>
291    
292    <d:item name="bogus comment"
293        class="tokenize-error">
294      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
295      by <code>--</code>.</d:message>
296      <d:desc xml:lang="en">
297        <p>There is a <code>&lt;</code> (<code>U+003C</code>
298        <code class="charname">LESS-THAN SIGN</code>) character
299        followed by a <code>!</code> (<code>U+0021</code>
300        <code class="charname">EXCLAMATION MARK</code>) character,
301        which is not followed by a <code>--</code> or
302        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
303    
304        <dl class="switch">
305        <dt>Comments</dt>
306          <dd>In HTML document, comments must be introduced by
307          <code class="example">&lt;!--</code> (<code>&lt;!</code>
308          <em>immediately</em> followed
309          by <em>two</em> <code>-</code>s) and must be terminated by
310          <code class="example">--></code>.
311          Strings <code>&lt;!</code> not followed
312          by <code>--</code> and <code>&lt;!-</code> not followed by
313          <code>-</code> are not valid open delimiters for comments.</dd>
314        <dt>Marked sections, including <code>CDATA</code> sections</dt>
315          <dd>Marked sections are not allowed in HTML document.</dd>
316        <dt>Markup declarations</dt>
317          <dd>Markup declarations, except for <code>DOCTYPE</code>
318          and comment declarations, are not allowed in HTML document.</dd>
319        <dt>String <code>&lt;!</code></dt>
320          <dd>String <code>&lt;!</code> must be escaped as
321          <code class="example">&amp;lt;!</code>.</dd>
322        </dl>
323      </d:desc>
324    </d:item>
325    
326  <d:item name="bogus end tag"  <d:item name="bogus end tag"
327      class="tokenize-error">      class="tokenize-error">
328    <d:message xml:lang="en">A <code>&lt;/</code> string is not followed    <d:message xml:lang="en">String <code>&lt;/</code> is not followed
329    by a tag name.</d:message><!-- </ non-name-start-char-non-EOF -->    by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
330    <d:desc xml:lang="en">    <d:desc xml:lang="en">
331      <p>There is a <code>&lt;</code> (<code>U+003C</code>      <p>There is a <code>&lt;</code> (<code>U+003C</code>
332      <code class="charname">LESS-THAN SIGN</code>) character      <code class="charname">LESS-THAN SIGN</code>) character
# Line 226  Web Document Conformance Checker (BETA)< Line 377  Web Document Conformance Checker (BETA)<
377    
378  <d:item name="nestc"  <d:item name="nestc"
379      class="tokenize-error">      class="tokenize-error">
380    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be    <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
381    used for this element.</d:message>    used for this element.</d:message>
382    <d:desc xml:lang="en">    <d:desc xml:lang="en">
383      <p>Void element syntax (<code>/></code>) must not be used      <p>Polytheistic slash (<code>/></code>) must not be used
384      for the element.  The document is non-conforming.</p>      for the element.  The document is non-conforming.</p>
385    
386      <p>The void element syntax can only be      <p>The polytheistic slash can only be
387      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
388      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
389      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
390      <code>col</code>, and <code>input</code> elements.</p>      <code>col</code>, and <code>input</code> elements.</p>
391    
392      <p>Note that, unlike in XML, the void element syntax has      <dl class="switch">
393        <dt><code>&lt;script/></code></dt>
394            <dd><p>The polytheistic slash cannot be used for <code>script</code>
395            element.  Even for an empty <code>script</code> element,
396            there must be an explicit end tag
397            <code class="html example">&lt;/script></code>.</p>
398    
399            <p><strong>NOTE</strong>: Though some user agents interpret
400            polytheistic slash for <code>script</code> element as the
401            closing of the element, such usage is not allowed under
402            the current standard.</p></dd>
403        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
404        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
405        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
406            <dd>These elements are themselves non-conforming.</dd>
407        <!-- isindex, image -->
408        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
409        <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
410            <dd>Future revision of HTML5 parsing algorithm is expected
411            to allow polytheistic slash for these elements.</dd>
412        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
413            <dd>These elements are not always empty and therefore
414            polytheistic slash is not allowed.  Use explicit end tag
415            to represent empty element as:
416              <pre class="example html"><code>&lt;p>&lt;/p></code></pre>
417            </dd>
418        </dl>
419    
420        <p>Note that, unlike in XML, the polytheistic slash has
421      no effect in HTML.</p>      no effect in HTML.</p>
422    </d:desc>    </d:desc>
423  </d:item>  </d:item>
# Line 247  Web Document Conformance Checker (BETA)< Line 426  Web Document Conformance Checker (BETA)<
426  <d:item name="pio"  <d:item name="pio"
427      class="tokenize-error">      class="tokenize-error">
428    <d:message xml:lang="en">Processing instruction    <d:message xml:lang="en">Processing instruction
429    (<code>&lt;?<var>...</var>?></code>) cannot be used.</d:message>    (<code>&lt;?<var>...</var>></code>) cannot be used.</d:message>
430    <d:desc xml:lang="en">    <d:desc xml:lang="en">
431      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
432      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
433      and XML style sheet <abbr title="processing instruction">PI</abbr>      and XML style sheet <abbr title="processing instruction">PI</abbr>
434      (<code>&lt;xml-stylesheet <var>...</var>?></code>), are not allowed      (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
435      in the HTML syntax.  The document is non-conforming.</p>      in the HTML syntax.  The document is non-conforming.</p>
436    
437      <p>If it is necessary to embed a processing instruction      <dl class="switch">
438      in the HTML document, you must use the XML syntax instead.</p>      <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
439          <dd>An <abbr>XBL</abbr> binding cannot be associated by
440      <p>In the HTML syntax, XML declaration is not necessary.</p>        <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
441          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
442      <p>Instead of XML style sheet,        style sheet as:
443      <abbr title="processing instruction">PI</abbr>s, you must          <pre class="html example"><code>&lt;style>
444      use the HTML <code>link</code> element whose <code>rel</code>  p {
445      attribute is set to <code>stylesheet</code> (or    binding: url(binding.xbl);
446      <code>alternate stylesheet</code> for an aleternate style sheet).</p>  }
447    &lt;/style></code></pre>
448          </dd>
449        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
450            <dd>XML declaration is unnecessary for HTML documents.</dd>
451        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
452        <abbr title="processing instruction">PI</abbr>)</dt>
453            <dd>Use HTML <code>link</code> element with <code>rel</code>
454            attribute set to <code>stylesheet</code> (or,
455            <code>alternate stylesheet</code> for an alternate style
456            sheet).
457              <pre class="example html"><code>&lt;link rel=stylesheet href="path/to/stylesheet.css"></code></pre>
458            </dd>
459        <dt><code>&lt;?php?&gt;</code> or
460        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
461        (<abbr>PHP</abbr> code)</dt>
462            <dd>The conformance checker does <em>not</em> support
463            checking for PHP source documents.</dd>
464        <dt>Other processing instructions</dt>
465            <dd>Processing instructions cannot be inserted in an HTML
466            document.  Use XML document or insert
467            <code>ProcessingInstruction</code> node by scripting.</dd>
468        </dl>
469    
470      <p>Web browsers will parse processing instructions as bogus      <p>Web browsers will parse processing instructions as bogus
471      comments.  Some legacy Web browsers, such as IE:mac and      comments.  Some legacy Web browsers, such as IE:mac and
472      some mobile browsers, will display processing instructions      some mobile Web browsers, will display processing instructions
473      as string.</p>      as string.</p>
474    </d:desc>    </d:desc>
475  </d:item>  </d:item>
# Line 318  Web Document Conformance Checker (BETA)< Line 519  Web Document Conformance Checker (BETA)<
519  <d:item name="in body"  <d:item name="in body"
520      class="parse-error">      class="parse-error">
521    <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>    <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
522    is not allowed in a <code>body</code> element.</d:message>    is not allowed in the <code>body</code> element.</d:message>
523    <d:desc xml:lang="en">    <d:desc xml:lang="en">
524      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
525      cannot be a descendant of <code>body</code> element, appears      cannot be a descendant of <code>body</code> element, appears
# Line 329  Web Document Conformance Checker (BETA)< Line 530  Web Document Conformance Checker (BETA)<
530    
531  <d:item name="in head:head"  <d:item name="in head:head"
532      class="parse-error">      class="parse-error">
533    <d:message xml:lang="en">Start tag <code>&lt;<var>head</var>&gt;</code>    <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
534    is not allowed in the <code>head</code> element.</d:message>    is not allowed in the <code>head</code> element.</d:message>
535    <d:desc xml:lang="en">    <d:desc xml:lang="en">
536      <p>There is a start tag <code>&lt;head></code> in the      <p>There is a start tag <code>&lt;head></code> in the
# Line 404  Web Document Conformance Checker (BETA)< Line 605  Web Document Conformance Checker (BETA)<
605      </p>      </p>
606    
607      <p>Only white space characters and comments are allowed      <p>Only white space characters and comments are allowed
608      before the <code>DOCTYPE</code>.</p>      before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
609        allowed in HTML document.</p>
610    </d:desc>    </d:desc>
611  </d:item>  </d:item>
612    
# Line 416  Web Document Conformance Checker (BETA)< Line 618  Web Document Conformance Checker (BETA)<
618      <p>End tag of an element is not found before, for example,      <p>End tag of an element is not found before, for example,
619      an end tag of another element appears or      an end tag of another element appears or
620      the end of the document.  The document is non-conforming.</p>      the end of the document.  The document is non-conforming.</p>
621    
622        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
623        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
624        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
625        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
626        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
627        <code>th</code>, <code>thead</code>, <code>tr</code>,
628        <code>ul</code> end tag can be omitted in HTML documents.
629        For any element except for void element, there must be an explicit
630        end tag.</p>
631    
632        <dl class="switch">
633        <dt>HTML <code>canvas</code> element</dt>
634          <dd>Though the element is void in earlier versions of Safari,
635          the <code>canvas</code> element is <em>no</em> longer
636          defined as empty.  There must be an end tag
637          <code class="html example">&lt;/canvas></code>.</dd>
638        </dl>
639    
640        <p>Note that misnesting tags, such as
641        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
642        allowed and they also cause this error.</p>
643    </d:desc>    </d:desc>
644  </d:item>  </d:item>
645    
# Line 444  Web Document Conformance Checker (BETA)< Line 668  Web Document Conformance Checker (BETA)<
668    <d:desc xml:lang="en">    <d:desc xml:lang="en">
669      <p>The document contains a <code>DOCTYPE</code> declaration      <p>The document contains a <code>DOCTYPE</code> declaration
670      that is different from HTML5 <code>DOCTYPE</code> (i.e.      that is different from HTML5 <code>DOCTYPE</code> (i.e.
671      <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>      <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
672        The document is non‐conforming.</p>
673    
674      <p>The document might or might not be conformant to      <p>The document might or might not be conformant to
675      some version of HTML.  However, conformance to any HTML      some version of HTML.  However, conformance to any HTML
# Line 464  Web Document Conformance Checker (BETA)< Line 689  Web Document Conformance Checker (BETA)<
689    
690      <p>For any end tag in HTML document, there must be a      <p>For any end tag in HTML document, there must be a
691      corresponding start tag.</p>      corresponding start tag.</p>
692    
693        <dl class="switch">
694        <dt>HTML <code>base</code>, <code>basefont</code>,
695        <code>bgsound</code>, <code>br</code>, <code>col</code>,
696        <code>embed</code>, <code>frame</code>, <code>hr</code>,
697        <code>image</code>, <code>img</code>, <code>input</code>,
698        <code>isindex</code>, <code>link</code>, <code>meta</code>,
699        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
700          <dd>End tag is not allowed for these elements, since
701          those content must always be empty.  Remove end tag.</dd>
702        <!-- keygen -->
703        <!-- command, event-source, nest, source -->
704        </dl>
705    </d:desc>    </d:desc>
706  </d:item>  </d:item>
707    
# Line 508  Web Document Conformance Checker (BETA)< Line 746  Web Document Conformance Checker (BETA)<
746      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
747      The document is non-conforming.</p>      The document is non-conforming.</p>
748    
749      <p>For example:      <dl class="switch">
750        <ul>      <dt>HTML <code>head</code> element</dt>
751        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
752        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
753        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
754        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
755        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
756        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
757      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
758        </dl>
759    </d:desc>    </d:desc>
760  </d:item>  </d:item>
761    
# Line 539  Web Document Conformance Checker (BETA)< Line 778  Web Document Conformance Checker (BETA)<
778      <p>An element appears where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
779      is non-conforming.</p>      is non-conforming.</p>
780    
     <p><strong>Note</strong>: The conformance checker does  
     <em>not</em> support form elements yet.</p>  
   
781      <p>Possible causes:      <p>Possible causes:
782        <dl class="switch">        <dl class="switch">
783        <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 552  Web Document Conformance Checker (BETA)< Line 788  Web Document Conformance Checker (BETA)<
788    
789            <p>Any inline-level content must be put            <p>Any inline-level content must be put
790            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
791        <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>,
792        such as <code>div</code>, <code>h<var>n</var></code>, or        <code>div</code>, <code>h<var>n</var></code>,
793        <code>section</code></dt>        <code>p</code>, or <code>section</code></dt>
794            <dd><p>Though some elements such as <code>div</code>,            <dd><dl class="switch">
795            <code>li</code>, and <code>td</code> allow                <dt>If the parent element is <code>div</code>,
796            <em>either one</em> of block-level or inline-level content                <code>li</code>, <code>td</code>, or <code>th</code></dt>
797            is allowed.  If there is a block-level content,                <!-- @@ TODO: more... -->
798            any inline-level content must be put                    <!-- @@ TODO: <p><ul><li><p> -->
799            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <dd><p>The parent element allows <em>either</em>
800                      block-level or inline-level content.  If there is a
801                      block-level content, any inline-level content must be
802                      put in e.g. paragraph element such as <code>p</code>.</p>
803                      <p>For example, an HTML document fragment
804                      <code class="html bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
805                      is non-conforming, since a word <q>World!</q> does not belong
806                      to any paragraph.  (If not part of any paragraph, what is
807                      it!?)  A conforming example would be:
808                        <pre class="html example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
809                      </p></dd>
810                  <dt>If the parent element does <em>not</em> allow
811                  block-level elements as content</dt>
812                      <dd>The element is not allowed to be inserted here.
813                      For example, a <code>div</code> element cannot be
814                      a child of an <code>h1</code> element.</dd>
815              </dl></dd>
816        <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>
817            <dd>The <code>noscript</code> element is allowed only in the context            <dd>The <code>noscript</code> element is allowed only in the context
818            where a block-level or inline-level content is expected            where a block-level or inline-level content is expected
819            and in the <code>head</code> element.            and in the <code>head</code> element.
820            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>,
821            or <code>select</code>.</dd>            or <code>select</code>.</dd>
       <dt>If the element with the error is the <code>html</code> element  
       that is the root element of an XHTML document</dt>  
           <dd><p>In an XHTML document, the root <code>html</code>  
           element must have an <code>xmlns</code> attribute  
           whose value is set to  
           <code>http://www.w3.org/1999/xhtml</code>.</p></dd>  
822        <dt>If the element with the error is <code>blink</code>,        <dt>If the element with the error is <code>blink</code>,
823        <code>center</code>, or <code>marquee</code> element</dt>        <code>center</code>, or <code>marquee</code> element</dt>
824            <dd>These elements are not part of the HTML standard.            <dd>These elements are not part of the HTML standard.
825            Use CSS for styling control.</dd>            Use CSS for styling control.</dd>
826    
827          <dt><code>button</code>, <code>datalist</code>,
828          <code>fieldset</code>, <code>form</code>,
829          <code>input</code>, <code>label</code>,
830          <code>optgroup</code>, <code>option</code>, <code>output</code>,
831          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
832          <code>textarea</code>, or <code>textarea</code> element</dt>
833          <!-- rbc, rtc ? -->
834              <dd>These elements are intentionally not supported by the conformance
835              checker <em>yet</em>.</dd>
836        </dl>        </dl>
837      </p>      </p>
838    </d:desc>    </d:desc>
839  </d:item>  </d:item>
840    
841    <d:item name="element not allowed:root"
842        class="content-model-error">
843      <d:message xml:lang="en">This element is not allowed as a root
844      element.</d:message>
845      <d:desc xml:lang="en">
846        <p>An element that is not allowed as the root element
847        is used as the root element of the document.  The document is
848        non-conforming, as far as the conformance checker can tell.</p>
849    
850        <dl class="switch">
851        <dt><code>html</code> element in an XHTML document</dt>
852            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
853            element must have an <code>xmlns</code> attribute as:
854              <pre class="xml example"><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"></code></pre></p></dd>
855        <dt><code>rss</code> element</dt>
856            <dd><p>The document is written in some version of RSS.</p>
857            <p>The conformance checker does not support any version
858            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
859        <dt><code>feed</code> element</dt>
860            <dd><p>The Atom <code>feed</code> element must be
861            in the <code>http://www.w3.org/2005/Atom</code>
862            namespace as:
863              <pre class="xml example"><code>&lt;feed xmlns="http://www.w3.org/2005/Atom"></code></pre>
864            </p>
865            <p>The conformance checker does not support Atom 0.3.
866            Use Atom 1.0 for feed documents.</p></dd>
867        </dl>
868      </d:desc>
869    </d:item>
870    
871  <d:item name="ps element missing"  <d:item name="ps element missing"
872      class="content-model-error">      class="content-model-error">
873    <d:message xml:lang="en">There is no <code><var>$0</var></code>    <d:message xml:lang="en">There is no <code><var>$0</var></code>
# Line 609  Web Document Conformance Checker (BETA)< Line 895  Web Document Conformance Checker (BETA)<
895      is non-conforming.</p>      is non-conforming.</p>
896    
897      <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.  
898      Without required attributes specified, user agents      Without required attributes specified, user agents
899      cannot provide the full functionality of the element      cannot provide full functionality of the element to the user.</p>
900      to the user.</p>  
901        <dl class="switch">
902        <dt>HTML <code>img</code> element</dt>
903            <dd>The <code>src</code> attribute must be specified.
904            Additionally, the <code>alt</code> attribute must be specified
905            in many cases.</dd>
906        <dt>HTML <code>link</code> element</dt>
907            <dd>The <code>rel</code> attribute must be specified.
908            Note that the <code>rev</code> attribute is obsolete.</dd>
909        </dl>
910    </d:desc>    </d:desc>
911  </d:item>  </d:item>
912    
# Line 642  Web Document Conformance Checker (BETA)< Line 935  Web Document Conformance Checker (BETA)<
935      <p>The <code>xml:lang</code> attribute is not allowed in      <p>The <code>xml:lang</code> attribute is not allowed in
936      HTML document.  The document is non-conforming.</p>      HTML document.  The document is non-conforming.</p>
937    
938      <p>The <code>lang</code> attribute in the <code>null</code>      <p>Use of the <code>xml:lang</code> attribute is conforming
939      namespace for HTML elements is defined as conforming <em>only</em> for      <em>only</em> in XML documents.</p>
     XML document.</p>  
940    
941      <p>To specify natural language information in HTML document,      <p>To specify natural language information in HTML document,
942      use <code>lang</code> attribute instead.</p>      use <code>lang</code> attribute instead.</p>
# Line 685  Web Document Conformance Checker (BETA)< Line 977  Web Document Conformance Checker (BETA)<
977      XML document.  The document is non-conforming.</p>      XML document.  The document is non-conforming.</p>
978    
979      <p>The <code>lang</code> attribute in <code>null</code>      <p>The <code>lang</code> attribute in <code>null</code>
980      namespace for HTML elements is defined as conforming <em>only</em> for      namespace for HTML elements is conforming <em>only</em> in
981      HTML document.</p>      HTML documents.</p>
982    
983      <p>To specify natural language information in XML document,      <p>To specify natural language information in XML document,
984      use <code>xml:lang</code> attribute instead.</p>      use <code>xml:lang</code> attribute instead.</p>
# Line 724  Web Document Conformance Checker (BETA)< Line 1016  Web Document Conformance Checker (BETA)<
1016    
1017      <dl>      <dl>
1018      <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>      <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
1019          <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>          <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
1020          is allowed.</p>          are allowed.</p>
1021          <p>Value <code>Content-Type</code> is obsolete; for charset          <p>Value <code>Content-Type</code> is obsolete; for charset
1022          declaration, the <code>charset</code> attribute can be used as:          declaration, the <code>charset</code> attribute can be used as:
1023          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
# Line 743  Web Document Conformance Checker (BETA)< Line 1035  Web Document Conformance Checker (BETA)<
1035    </d:desc>    </d:desc>
1036  </d:item>  </d:item>
1037    
1038    <d:item name="enumerated:invalid:http-equiv:content-type"
1039        class="attribute-value-error">
1040      <d:message xml:lang="en">Character encoding declaration syntax
1041      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1042      is obsolete.</d:message>
1043      <d:desc xml:lang="en">
1044        <p>Old long character encoding declaration syntax
1045        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1046        is in use.  The document is non‐conforming.</p>
1047    
1048        <p>The new character encoding declaration syntax is:
1049          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1050        </p>
1051      </d:desc>
1052    </d:item>
1053    
1054  <d:item name="duplicate ID"  <d:item name="duplicate ID"
1055      class="attribute-value-error">      class="attribute-value-error">
1056    <d:message xml:lang="en">This identifier has already been    <d:message xml:lang="en">This identifier has already been
# Line 775  Web Document Conformance Checker (BETA)< Line 1083  Web Document Conformance Checker (BETA)<
1083      <p>The specified link type is non-conforming, and therefore      <p>The specified link type is non-conforming, and therefore
1084      the document is non-conforming.</p>      the document is non-conforming.</p>
1085    
1086      <dl>      <dl class="switch">
1087      <dt>Link type <code>contents</code></dt>      <dt>Link type <code>contents</code></dt>
1088        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1089      <dt>Link type <code>copyright</code></dt>      <dt>Link type <code>copyright</code></dt>
1090        <dd>Use link type <code>license</code>.</dd>        <dd>Use link type <code>license</code>.</dd>
1091      <dt>Link type <code>home</code></dt>      <dt>Link type <code>home</code></dt>
1092        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1093        <dt>Link type <code>previous</code></dt>
1094          <dd>Use link type <code>prev</code>.</dd>
1095      <dt>Link type <code>start</code></dt>      <dt>Link type <code>start</code></dt>
1096        <dd>Use link type <code>first</code>.</dd>        <dd>Use link type <code>first</code>.</dd>
1097      <dt>Link type <code>toc</code></dt>      <dt>Link type <code>toc</code> or <code>top</code></dt>
1098        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1099      </dl>      </dl>
1100    </d:desc>    </d:desc>
# Line 827  Web Document Conformance Checker (BETA)< Line 1137  Web Document Conformance Checker (BETA)<
1137    
1138      <p><strong>Warning</strong>: The data served to the      <p><strong>Warning</strong>: The data served to the
1139      conforming checker might be out of date; it might have already      conforming checker might be out of date; it might have already
1140      been accepted or rejected, depending on which the document      been accepted or rejected.  The document might or might not be
1141      might be conforming or non-conforming.  See WHATWG Wiki      conforming depending on the status.  See WHATWG Wiki
1142      for the latest information.</p>      for the latest information.</p>
1143    </d:desc>    </d:desc>
1144  </d:item>  </d:item>
# Line 863  Web Document Conformance Checker (BETA)< Line 1173  Web Document Conformance Checker (BETA)<
1173      The document is non-conforming.</p>      The document is non-conforming.</p>
1174    
1175      <p>For example, the table below is non-conforming:      <p>For example, the table below is non-conforming:
1176        <pre class="html non-conforming example"><code>&lt;table>        <pre class="html bad example"><code>&lt;table>
1177  &lt;tbody>  &lt;tbody>
1178  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
1179  &lt;/tbody>  &lt;/tbody>
1180  &lt;/table></code></pre>  &lt;/table></code></pre>
1181      ... is non-conforming, since the second row contains only      ... since the second row contains only
1182      a cell that spans the first and the second rows.</p>      a cell that spans between first and second rows.</p>
1183    </d:desc>    </d:desc>
1184  </d:item>  </d:item>
1185    
# Line 882  Web Document Conformance Checker (BETA)< Line 1192  Web Document Conformance Checker (BETA)<
1192      class="should" level="s">      class="should" level="s">
1193    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
1194    subtype is used.</d:message>    subtype is used.</d:message>
1195      <d:item xml:lang="en">
1196        <p>The specified Internet Media Type is registered with status
1197        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
1198        
1199        <dl class="swtich">
1200        <dt>Media type <code>text/ecmascript</code></dt>
1201          <dd>Media type <code>text/ecmascript</code> is obsoleted in
1202          favor of <code>application/ecmascript</code>.  Note that
1203          <code>text/javascript</code> would be better alternative
1204          for many cases.</dd>
1205        <dt>Media type <code>text/javascript</code></dt>
1206          <dd>Media type <code>text/javascript</code> is obsoleted by
1207          <abbr>IETF</abbr> with backward incompatible alternate
1208          <code>application/javascript</code> for architectural
1209          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
1210        </dl>
1211      </d:item>
1212  </d:item>  </d:item>
1213    
1214  <d:item name="IMT:private subtype"  <d:item name="IMT:private subtype"
# Line 923  Web Document Conformance Checker (BETA)< Line 1250  Web Document Conformance Checker (BETA)<
1250    
1251  </section>  </section>
1252    
1253  <section id="uri-warnings">  <section id="uri-shoulds">
1254  <h2>URI (or IRI) Warnings</h2>  <h2>URI (or IRI) Should-level Errors</h2>
1255    
1256  <d:item name="URI::dot-segment"  <d:item name="URI::dot-segment"
1257      class="should" level="s">      class="should" level="s">
1258    <d:message xml:lang="en">Dot-segment (<code>.</code> or    <d:message xml:lang="en">A dot-segment (<code>.</code> or
1259    <code>..</code>) should not occur in an absolute reference.</d:message>    <code>..</code>) occurs in an absolute reference.</d:message>
1260    <d:desc>    <d:desc>
1261      <p>Dot-segment (<code>.</code> or <code>..</code>) should      <p>Dot-segment (<code>.</code> or <code>..</code>) should
1262      not occur in an absolute reference.</p>      not occur in an absolute reference.</p>
# Line 944  Web Document Conformance Checker (BETA)< Line 1271  Web Document Conformance Checker (BETA)<
1271    
1272  <d:item name="URI::empty path"  <d:item name="URI::empty path"
1273      class="should" level="s">      class="should" level="s">
1274    <d:message xml:lang="en">This IRI should explicitly end with    <d:message xml:lang="en">This IRI does not end with
1275    <code>/</code>.</d:message>    a <code>/</code>.</d:message>
1276      <d:item xml:lang="en">
1277        <p>The IRI does not end with a <code>/</code>.  If there is an
1278        authority component in an IRI, a <code>/</code> should be present
1279        instead of empty path component.</p>
1280    
1281        <p>For example, <code>http://www.example.com<strong>/</strong></code>
1282        is preferred to <code>http://www.example.com</code>.</p>
1283      </d:item>
1284  </d:item>  </d:item>
1285    
1286  <d:item name="URI::lowercase hexadecimal digit"  <d:item name="URI::lowercase hexadecimal digit"
1287      class="should" level="s">      class="should" level="s">
1288    <d:message xml:lang="en">Hexadecimal digit in percent-encoding    <d:message xml:lang="en">A lowercase hexadecimal digit is used
1289    should be in lowercase.</d:message>    in percent-encoding.</d:message>
1290    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1291      <p>The hexadecimal digit in percent-encoding string in the IRI      <p>The hexadecimal digit in percent-encoding string in the IRI
1292      is in lowercase.  Though the IRI <em>is</em> conforming,      is in lowercase.  Though the IRI <em>is</em> conforming,
# Line 992  Web Document Conformance Checker (BETA)< Line 1327  Web Document Conformance Checker (BETA)<
1327    
1328  </section>  </section>
1329    
1330    <section id="cache-manifest-errors">
1331    <h2>Cache Manifest Errors</h2>
1332    
1333    <d:item name="not manifest" class="must" level="m">
1334      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
1335      <d:desc xml:lang="en">
1336        <p>The specified document is <em>not</em> a cache manifest.
1337        The document is non-conforming.</p>
1338    
1339        <p>An entity labeled as Internet media type
1340        <code>text/cache-manifest</code> must contain a cache manifest.</p>
1341    
1342        <p>A cache manifest must start with a line whose content is
1343        <code class="manifest example">CACHE MANIFEST</code>
1344        (exactly one space character between
1345        <code>CACHE</code> and <code>MANIFEST</code>).</p>
1346      </d:desc>
1347    </d:item>
1348    </section>
1349    
1350  <section id="unsupported-messages">  <section id="unsupported-messages">
1351  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1352    
1353  <d:item name="attribute"  <d:item name="element"
1354      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1355    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1356    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> is not supported; <em>it might or
1357      might not be conforming</em>.</d:message>
1358    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1359      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1360      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1361    </d:desc>    </d:desc>
1362  </d:item>  </d:item>
1363    
1364  <d:item name="element"  <d:item name="attribute"
1365      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1366    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1367    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1368      <code><var>{element-local-name}</var></code> is not supported;
1369      <em>it might or might not be conforming</em>.</d:message>
1370    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1371      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
1372      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1373    </d:desc>    </d:desc>
1374  </d:item>  </d:item>
1375    
1376  <d:item name="link type"  <d:item name="link type"
1377      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1378    <d:message xml:lang="en">The link type <code><var>$0</var></code> is not    <d:message xml:lang="en">Link type <code><var>$0</var></code> is not
1379    standardized or registered at the time of the release of the conformance    standardized or registered at the time of the release of the conformance
1380    checker; <em>it is non-conforming unless it has now been    checker; <em>it is non-conforming unless it now has been
1381    registered</em>.</d:message>    registered</em>.</d:message>
1382    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1383      <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.
# Line 1047  Web Document Conformance Checker (BETA)< Line 1405  Web Document Conformance Checker (BETA)<
1405    is not supported; <em>it might or might not be conforming.</em></d:message>    is not supported; <em>it might or might not be conforming.</em></d:message>
1406  </d:item>  </d:item>
1407    
 <d:item name="language tag"  
     class="unsupported" level="unsupported">  
   <d:message xml:lang="en">Conformance checking for language tag  
   is not supported; <em>it might or might not be conforming.</em></d:message>  
 </d:item>  
   
1408  <d:item name="media query"  <d:item name="media query"
1409      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1410    <d:message xml:lang="en">Conformance checking for media query    <d:message xml:lang="en">Conformance checking for media query
# Line 1084  manakaiIsHTML:1;;HTML Document Line 1436  manakaiIsHTML:1;;HTML Document
1436  manakaiIsHTML:0;;XML Document  manakaiIsHTML:0;;XML Document
1437  </d:catalog>  </d:catalog>
1438    
1439    <section id="levels">
1440    <h2>Error Levels</h2>
1441    
1442    <table id="levels-table">
1443    <thead>
1444    <tr><th scope="col">Level</th>
1445    <th scope="col">Conforming?</th>
1446    <th scope="col">Description</th>
1447    </tr>
1448    </thead>
1449    <tbody>
1450    <tr id="level-m" class="level-m">
1451    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
1452    <td>Non‐conforming.</td>
1453    <td>A violation to a hard requirement of the specification.
1454    The document is non‐conforming.</td>
1455    </tr>
1456    <tr id="level-s" class="level-s">
1457    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
1458    <td>Non‐conforming, but <em>in some case</em>
1459    conforming.</td>
1460    <td>A violation to a requirement of the specification.
1461    The violation might be legitimize in some case.  Otherwise,
1462    the document is non‐conforming.</td>
1463    </tr>
1464    <tr id="level-w" class="level-w">
1465    <th scope="row">Warning</th>
1466    <td>Conforming.</td>
1467    <td>A warning is an advice from the conformance checker to avoid
1468    to solve a problem in a confusing or possibly wrong way.
1469    It does not affect to the conformance of the document, and
1470    may sometimes be inappropriate.</td>
1471    </tr>
1472    <tr id="level-unsupported" class="level-unsupported">
1473    <th scope="row">Not supported</th>
1474    <td><em>Unknown</em>.</td>
1475    <td>Some feature that is not supported by the conformance checker
1476    is used in the document.</td>
1477    </tr>
1478    </tbody>
1479    </table>
1480    </section>
1481    
1482  <section id="license">  <section id="license">
1483  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1484    
1485  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>
1486  <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>
1487    <code class="mail">&lt;<a href="mailto:[email protected]">[email protected]</a>></code>.</p>
1488    
1489    <p>This document is free software; you can redistribute it
1490  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1491  </section>  </section>
1492    
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