/[pub]/test/html-webhacc/error-description-source.xml
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revision 1.6 by wakaba, Sat Jul 21 04:58:17 2007 UTC revision 1.26 by wakaba, Sun Jul 27 10:33:45 2008 UTC
# Line 11  Web Document Conformance Checker (BETA)< Line 11  Web Document Conformance Checker (BETA)<
11  <body>  <body>
12  <h1>Description of Errors</h1>  <h1>Description of Errors</h1>
13    
14    <section id="character-encoding-layer">
15    <h2>Character Encoding Layer Errors</h2>
16    
17    <d:item name="illegal-octets-error" class="error-category-charset" level="m">
18      <d:message xml:lang="en">An illegal octet in the input stream.</d:message>
19    </d:item>
20    </section>
21    
22    <section id="html5-character-encoding">
23    <h2>HTML5 Character Encoding Errors</h2>
24    
25    <d:item name="character encoding" class="format-charset must" level="m">
26      <d:message xml:lang="en">Character encoding <code><var>$0</var></code>
27      is not allowed for <abbr>HTML</abbr> document.</d:message>
28      <d:desc xml:lang="en">
29        <p>The character encoding used for the document is not allowed
30        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
31      </d:desc>
32    </d:item>
33    
34    <d:item name="character encoding" class="format-charset should"
35        level="s">
36      <d:message xml:lang="en">Character encoding <code><var>$0</var></code>
37      should not be used for <abbr>HTML</abbr> document.</d:message>
38      <d:desc xml:lang="en">
39        <p>The character encoding used for the document is not recommended
40        for <abbr>HTML</abbr> document.  The document is non‐conforming
41        unless there is any good reason to use that encoding.</p>
42      </d:desc>
43    </d:item>
44    
45    <d:item name="character encoding" class="format-charset warning"
46        level="w">
47      <d:message xml:lang="en">Use of UTF-8 is encouraged.</d:message>
48      <d:desc xml:lang="en">
49        <p>Use of UTF-8 as the character encoding of the document is encouraged,
50        though the use of another character encoding is still conforming.</p>
51      </d:desc>
52    </d:item>
53    
54    <d:item name="character encoding" class="format-charset unsupported"
55        level="unsupported">
56      <d:message xml:lang="en">Conformance for character encoding requirements
57      cannot be checked.</d:message>
58      <d:desc xml:lang="en">
59        <p>The conformance checker cannot detect whether the input document
60        met the requirements on character encoding, since the document
61        is not inputed as a serialized byte sequence.  The document is
62        not conforming if it is not encoded in an appropriate character
63        encoding with appropriate labeling.</p>
64      </d:desc>
65    </d:item>
66    
67    <d:item name="no character encoding declaration" class="format-charset error"
68        level="m">
69      <d:message xml:lang="en">There is no character encoding
70      declaration.</d:message>
71      <d:desc xml:lang="en">
72        <p>The document does not contain a character encoding
73        declaration.  Unless the character encoding is explicitly
74        specified in lower‐level protocol, e.g. in <abbr>HTTP</abbr>,
75        or is implied by <abbr>BOM</abbr>, there must be a character
76        encoding declaration.  The document is non‐conforming.</p>
77    
78        <p>The long character encoding declaration syntax
79        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
80        is obsolete.  The new syntax is:</p>
81        <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
82    
83        <p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr>
84        declaration has no effect for <abbr>HTML</abbr> document.</p>
85      </d:desc>
86    </d:item>
87    
88    <d:item name="non ascii superset" class="format-charset error"
89        level="m">
90      <d:message xml:lang="en">No character encoding metadata is found
91      in lower‐level protocol nor is there <abbr>BOM</abbr>, while
92      character encoding <code><var>$0</var></code>
93      is not a superset of <abbr>ASCII</abbr>.</d:message>
94      <d:desc xml:lang="en">
95        <p>The document is not labeled with character encoding name
96        in lower‐level protocol, e.g. in <abbr>HTTP</abbr>, and
97        the document is not begin with <abbr>BOM</abbr>.  In addition,
98        the character encoding of the document is not a superset of
99        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
100    
101        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
102        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
103        as:</p>
104        <pre class="http example"><code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
105    
106        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
107        <code class="html example">&lt;meta charset="<var>charset-name</var>"></code>,
108        does not allow to omit <code>charset</code> parameter
109        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
110        compatible encoding.</p>
111    
112        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
113        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
114        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
115      </d:desc>
116    </d:item>
117    
118    <d:item name="charset label detected" class="format-charset warning"
119        level="w">
120      <d:message xml:lang="en">While parsing the document as
121      <code><var>$0</var></code>, a character encoding declaration specifying
122      character encoding as <code><var>$1</var></code> is found.  The document
123      is reparsed.</d:message>
124      <d:desc xml:lang="en">
125        <p>While parsing a document in a character encoding,
126        a character encoding declaration which declares the character
127        encoding of the document as another character encoding is found.
128        The occurence of this warning itself does not make the document
129        non‐conforming.  However, the failure of the first attempt to
130        to detect the character encoding might be a result of non‐conformance
131        of the document.</p>
132    
133        <p>The document will be reparsed from the beginning.  Some error
134        or warning might be reported again.</p>
135    
136        <p>These are suggestions to avoid this warning:</p>
137        <ul>
138        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
139        field in the <abbr>HTTP</abbr> header, as:
140        <pre class="HTTP example"><code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
141        <li>Put the character encoding declaration
142        (<code class="html example">&lt;meta charset="<var>charset-name</var>"></code>)
143        just after <code class="html example">&lt;head></code> start tag.</li>
144        <li>Use <code>UTF-8</code>.</li>
145        </ul>
146      </d:desc>
147    </d:item>
148    </section>
149    
150  <section id="html5-tokenize-error">  <section id="html5-tokenize-error">
151  <h2>HTML5 Parse Errors in Tokenization Stage</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
152    
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164    </d:desc>    </d:desc>
165  </d:item>  </d:item>
166    
167    <d:item name="after body"
168        class="parse-error">
169      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
170      is not allowed after the end tag <code>&lt;/body></code>.</d:message>
171      <d:desc xml:lang="en">
172        <p>The start or end tag of an element appears after the
173        <code>body</code> element has been closed.  The document is
174        non-conforming.</p>
175    
176        <p>Any content of the document other than <code>head</code>
177        contents and comments must be put into the <code>body</code>
178        element.</p>
179      </d:desc>
180    </d:item>
181    
182  <d:item name="bare ero"  <d:item name="bare ero"
183      class="tokenize-error">      class="tokenize-error">
184    <d:message xml:lang="en">The <code>&amp;</code> character must    <d:message xml:lang="en">The <code>&amp;</code> character must
185    introduce a reference.</d:message>    be escaped as <code class="html example">&amp;amp;</code>.</d:message>
186    <d:desc xml:lang="en">    <d:desc xml:lang="en">
187      <p>An <code>&amp;</code> (<code>U+0026</code>      <p>An <code>&amp;</code> character which
     <code class="charname">AMPERSAND</code>) character which  
188      is not part of any reference appears in the input stream.      is not part of any reference appears in the input stream.
189      The document is non-conforming.</p>      The document is non‐conforming.</p>
190    
191        <p><em>Any <code>&amp;</code> character in URI (or IRI)
192        must be escaped as <code class="example">&amp;amp;</code>.</em></p>
193    
194      <p>The <code>&amp;</code> character must      <p>The <code>&amp;</code> character must
195      be the first character of a reference:      be the first character of a reference:
196        <dl>        <dl class="switch">
197        <dt>Named entity reference</dt>        <dt>Named entity reference</dt>
198            <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>
199            where <var>entity-name</var> is the name of the            where <var>entity-name</var> is the name of the
# Line 63  Web Document Conformance Checker (BETA)< Line 216  Web Document Conformance Checker (BETA)<
216    </d:desc>    </d:desc>
217  </d:item>  </d:item>
218    
219    <d:item name="bare etago"
220        class="tokenize-error">
221      <d:message xml:lang="en">A <code>&lt;/</code> string is not followed
222      by a tag name.</d:message><!-- </ EOF -->
223      <d:desc xml:lang="en">
224        <p>There is a <code>&lt;</code> (<code>U+003C</code>
225        <code class="charname">LESS-THAN SIGN</code>) character
226        immediately followed by a <code>/</code> (<code>U+005F</code>
227        <code>SOLIDUS</code>) character, which is not part
228        of any end tag, in the input stream.  The document
229        is non-conforming.</p>
230    
231        <p>The <code>&lt;/</code> sequence immediately followed
232        by an <abbr title="End of file pseudo-character">EOF</abbr> is
233        interpreted as a string data of <code>&lt;/</code>.</p>
234    
235        <p>The <code>&lt;/</code> sequence as string data must
236        be escaped as:
237        <pre class="html example"><code>&amp;lt;/</code></pre>
238        </p>
239      </d:desc>
240    </d:item>
241    
242  <d:item name="bare stago"  <d:item name="bare stago"
243      class="tokenize-error">      class="tokenize-error">
244    <d:message xml:lang="en">A <code>&lt;</code> character is not followed    <d:message xml:lang="en">A <code>&lt;</code> character is not followed
# Line 93  Web Document Conformance Checker (BETA)< Line 269  Web Document Conformance Checker (BETA)<
269    
270      <p>The string <code>&amp;#</code> must be the first two characters      <p>The string <code>&amp;#</code> must be the first two characters
271      of a reference:      of a reference:
272        <dl>        <dl class="switch">
273        <dt>Numeric character reference</dt>        <dt>Numeric character reference</dt>
274            <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>            <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
275            where <var>d</var> is the decimal representation of            where <var>d</var> is the decimal representation of
# Line 134  Web Document Conformance Checker (BETA)< Line 310  Web Document Conformance Checker (BETA)<
310    </d:desc>    </d:desc>
311  </d:item>  </d:item>
312    
313    <d:item name="bogus comment"
314        class="tokenize-error">
315      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
316      by <code>--</code>.</d:message>
317      <d:desc xml:lang="en">
318        <p>There is a <code>&lt;</code> (<code>U+003C</code>
319        <code class="charname">LESS-THAN SIGN</code>) character
320        followed by a <code>!</code> (<code>U+0021</code>
321        <code class="charname">EXCLAMATION MARK</code>) character,
322        which is not followed by a <code>--</code> or
323        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
324    
325        <dl class="switch">
326        <dt>Comments</dt>
327          <dd>In HTML document, comments must be introduced by
328          <code class="example">&lt;!--</code> (<code>&lt;!</code>
329          <em>immediately</em> followed
330          by <em>two</em> <code>-</code>s) and must be terminated by
331          <code class="example">--></code>.
332          Strings <code>&lt;!</code> not followed
333          by <code>--</code> and <code>&lt;!-</code> not followed by
334          <code>-</code> are not valid open delimiters for comments.</dd>
335        <dt>Marked sections, including <code>CDATA</code> sections</dt>
336          <dd>Marked sections are not allowed in HTML document.</dd>
337        <dt>Markup declarations</dt>
338          <dd>Markup declarations, except for <code>DOCTYPE</code>
339          and comment declarations, are not allowed in HTML document.</dd>
340        <dt>String <code>&lt;!</code></dt>
341          <dd>String <code>&lt;!</code> must be escaped as
342          <code class="example">&amp;lt;!</code>.</dd>
343        </dl>
344      </d:desc>
345    </d:item>
346    
347    <d:item name="bogus end tag"
348        class="tokenize-error">
349      <d:message xml:lang="en">String <code>&lt;/</code> is not followed
350      by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
351      <d:desc xml:lang="en">
352        <p>There is a <code>&lt;</code> (<code>U+003C</code>
353        <code class="charname">LESS-THAN SIGN</code>) character
354        immediately followed by a <code>/</code> (<code>U+005F</code>
355        <code>SOLIDUS</code>) character, which is not part
356        of any end tag, in the input stream.  The document
357        is non-conforming.</p>
358    
359        <p>The <code>&lt;/</code> sequence not followed by a
360        tag name is parsed as an opening of bogus comment.</p>
361    
362        <p>The <code>&lt;/</code> sequence as string data must
363        be escaped as:
364        <pre class="html example"><code>&amp;lt;/</code></pre>
365        </p>
366      </d:desc>
367    </d:item>
368    
369  <d:item name="dash in comment"  <d:item name="dash in comment"
370      class="tokenize-error">      class="tokenize-error">
371    <d:message xml:lang="en">There is a <code>--</code> sequence    <d:message xml:lang="en">There is a <code>--</code> sequence
# Line 166  Web Document Conformance Checker (BETA)< Line 398  Web Document Conformance Checker (BETA)<
398    
399  <d:item name="nestc"  <d:item name="nestc"
400      class="tokenize-error">      class="tokenize-error">
401    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be    <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
402    used for this element.</d:message>    used for this element.</d:message>
403    <d:desc xml:lang="en">    <d:desc xml:lang="en">
404      <p>Void element syntax (<code>/></code>) must not be used      <p>Polytheistic slash (<code>/></code>) must not be used
405      for the element.  The document is non-conforming.</p>      for the element.  The document is non-conforming.</p>
406    
407      <p>The void element syntax can only be      <p>The polytheistic slash can only be
408      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
409      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
410      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
411      <code>col</code>, and <code>input</code> elements.</p>      <code>col</code>, and <code>input</code> elements.</p>
412    
413      <p>Note that, unlike in XML, the void element syntax has      <dl class="switch">
414        <dt><code>&lt;script/></code></dt>
415            <dd><p>The polytheistic slash cannot be used for <code>script</code>
416            element.  Even for an empty <code>script</code> element,
417            there must be an explicit end tag
418            <code class="html example">&lt;/script></code>.</p>
419    
420            <p><strong>NOTE</strong>: Though some user agents interpret
421            polytheistic slash for <code>script</code> element as the
422            closing of the element, such usage is not allowed under
423            the current standard.</p></dd>
424        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
425        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
426        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
427            <dd>These elements are themselves non-conforming.</dd>
428        <!-- isindex, image -->
429        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
430        <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
431            <dd>Future revision of HTML5 parsing algorithm is expected
432            to allow polytheistic slash for these elements.</dd>
433        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
434            <dd>These elements are not always empty and therefore
435            polytheistic slash is not allowed.  Use explicit end tag
436            to represent empty element as:
437              <pre class="example html"><code>&lt;p>&lt;/p></code></pre>
438            </dd>
439        </dl>
440    
441        <p>Note that, unlike in XML, the polytheistic slash has
442      no effect in HTML.</p>      no effect in HTML.</p>
443    </d:desc>    </d:desc>
444  </d:item>  </d:item>
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447  <d:item name="pio"  <d:item name="pio"
448      class="tokenize-error">      class="tokenize-error">
449    <d:message xml:lang="en">Processing instruction    <d:message xml:lang="en">Processing instruction
450    (<code>&lt;?<var>...</var>?></code>) cannot be used.</d:message>    (<code>&lt;?<var>...</var>></code>) cannot be used.</d:message>
451    <d:desc xml:lang="en">    <d:desc xml:lang="en">
452      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
453      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
454      and XML style sheet <abbr title="processing instruction">PI</abbr>      and XML style sheet <abbr title="processing instruction">PI</abbr>
455      (<code>&lt;xml-stylesheet <var>...</var>?></code>), are not allowed      (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
456      in the HTML syntax.  The document is non-conforming.</p>      in the HTML syntax.  The document is non-conforming.</p>
457    
458      <p>If it is necessary to embed a processing instruction      <dl class="switch">
459      in the HTML document, you must use the XML syntax instead.</p>      <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
460          <dd>An <abbr>XBL</abbr> binding cannot be associated by
461      <p>In the HTML syntax, XML declaration is not necessary.</p>        <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
462          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
463      <p>Instead of XML style sheet,        style sheet as:
464      <abbr title="processing instruction">PI</abbr>s, you must          <pre class="html example"><code>&lt;style>
465      use the HTML <code>link</code> element whose <code>rel</code>  p {
466      attribute is set to <code>stylesheet</code> (or    binding: url(binding.xbl);
467      <code>alternate stylesheet</code> for an aleternate style sheet).</p>  }
468    &lt;/style></code></pre>
469          </dd>
470        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
471            <dd>XML declaration is unnecessary for HTML documents.</dd>
472        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
473        <abbr title="processing instruction">PI</abbr>)</dt>
474            <dd>Use HTML <code>link</code> element with <code>rel</code>
475            attribute set to <code>stylesheet</code> (or,
476            <code>alternate stylesheet</code> for an alternate style
477            sheet).
478              <pre class="example html"><code>&lt;link rel=stylesheet href="path/to/stylesheet.css"></code></pre>
479            </dd>
480        <dt><code>&lt;?php?&gt;</code> or
481        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
482        (<abbr>PHP</abbr> code)</dt>
483            <dd>The conformance checker does <em>not</em> support
484            checking for PHP source documents.</dd>
485        <dt>Other processing instructions</dt>
486            <dd>Processing instructions cannot be inserted in an HTML
487            document.  Use XML document or insert
488            <code>ProcessingInstruction</code> node by scripting.</dd>
489        </dl>
490    
491      <p>Web browsers will parse processing instructions as bogus      <p>Web browsers will parse processing instructions as bogus
492      comments.  Some legacy Web browsers, such as IE:mac and      comments.  Some legacy Web browsers, such as IE:mac and
493      some mobile browsers, will display processing instructions      some mobile Web browsers, will display processing instructions
494      as string.</p>      as string.</p>
495    </d:desc>    </d:desc>
496  </d:item>  </d:item>
# Line 258  Web Document Conformance Checker (BETA)< Line 540  Web Document Conformance Checker (BETA)<
540  <d:item name="in body"  <d:item name="in body"
541      class="parse-error">      class="parse-error">
542    <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>
543    is not allowed in a <code>body</code> element.</d:message>    is not allowed in the <code>body</code> element.</d:message>
544    <d:desc xml:lang="en">    <d:desc xml:lang="en">
545      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
546      cannot be a descendant of <code>body</code> element, appears      cannot be a descendant of <code>body</code> element, appears
# Line 269  Web Document Conformance Checker (BETA)< Line 551  Web Document Conformance Checker (BETA)<
551    
552  <d:item name="in head:head"  <d:item name="in head:head"
553      class="parse-error">      class="parse-error">
554    <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>
555    is not allowed in the <code>head</code> element.</d:message>    is not allowed in the <code>head</code> element.</d:message>
556    <d:desc xml:lang="en">    <d:desc xml:lang="en">
557      <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 344  Web Document Conformance Checker (BETA)< Line 626  Web Document Conformance Checker (BETA)<
626      </p>      </p>
627    
628      <p>Only white space characters and comments are allowed      <p>Only white space characters and comments are allowed
629      before the <code>DOCTYPE</code>.</p>      before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
630        allowed in HTML document.</p>
631    </d:desc>    </d:desc>
632  </d:item>  </d:item>
633    
# Line 356  Web Document Conformance Checker (BETA)< Line 639  Web Document Conformance Checker (BETA)<
639      <p>End tag of an element is not found before, for example,      <p>End tag of an element is not found before, for example,
640      an end tag of another element appears or      an end tag of another element appears or
641      the end of the document.  The document is non-conforming.</p>      the end of the document.  The document is non-conforming.</p>
642    
643        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
644        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
645        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
646        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
647        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
648        <code>th</code>, <code>thead</code>, <code>tr</code>,
649        <code>ul</code> end tag can be omitted in HTML documents.
650        For any element except for void element, there must be an explicit
651        end tag.</p>
652    
653        <dl class="switch">
654        <dt>HTML <code>canvas</code> element</dt>
655          <dd>Though the element is void in earlier versions of Safari,
656          the <code>canvas</code> element is <em>no</em> longer
657          defined as empty.  There must be an end tag
658          <code class="html example">&lt;/canvas></code>.</dd>
659        </dl>
660    
661        <p>Note that misnesting tags, such as
662        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
663        allowed and they also cause this error.</p>
664    </d:desc>    </d:desc>
665  </d:item>  </d:item>
666    
# Line 384  Web Document Conformance Checker (BETA)< Line 689  Web Document Conformance Checker (BETA)<
689    <d:desc xml:lang="en">    <d:desc xml:lang="en">
690      <p>The document contains a <code>DOCTYPE</code> declaration      <p>The document contains a <code>DOCTYPE</code> declaration
691      that is different from HTML5 <code>DOCTYPE</code> (i.e.      that is different from HTML5 <code>DOCTYPE</code> (i.e.
692      <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>      <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
693        The document is non‐conforming.</p>
694    
695      <p>The document might or might not be conformant to      <p>The document might or might not be conformant to
696      some version of HTML.  However, conformance to any HTML      some version of HTML.  However, conformance to any HTML
# Line 404  Web Document Conformance Checker (BETA)< Line 710  Web Document Conformance Checker (BETA)<
710    
711      <p>For any end tag in HTML document, there must be a      <p>For any end tag in HTML document, there must be a
712      corresponding start tag.</p>      corresponding start tag.</p>
713    
714        <dl class="switch">
715        <dt>HTML <code>base</code>, <code>basefont</code>,
716        <code>bgsound</code>, <code>br</code>, <code>col</code>,
717        <code>embed</code>, <code>frame</code>, <code>hr</code>,
718        <code>image</code>, <code>img</code>, <code>input</code>,
719        <code>isindex</code>, <code>link</code>, <code>meta</code>,
720        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
721          <dd>End tag is not allowed for these elements, since
722          those content must always be empty.  Remove end tag.</dd>
723        <!-- keygen -->
724        <!-- command, event-source, nest, source -->
725        </dl>
726    </d:desc>    </d:desc>
727  </d:item>  </d:item>
728    
# Line 448  Web Document Conformance Checker (BETA)< Line 767  Web Document Conformance Checker (BETA)<
767      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
768      The document is non-conforming.</p>      The document is non-conforming.</p>
769    
770      <p>For example:      <dl class="switch">
771        <ul>      <dt>HTML <code>head</code> element</dt>
772        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
773        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
774        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
775        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
776        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
777        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
778      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
779        </dl>
780    </d:desc>    </d:desc>
781  </d:item>  </d:item>
782    
# Line 479  Web Document Conformance Checker (BETA)< Line 799  Web Document Conformance Checker (BETA)<
799      <p>An element appears where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
800      is non-conforming.</p>      is non-conforming.</p>
801    
     <p><strong>Note</strong>: The conformance checker does  
     <em>not</em> support form elements yet.</p>  
   
802      <p>Possible causes:      <p>Possible causes:
803        <dl class="switch">        <dl class="switch">
804        <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 492  Web Document Conformance Checker (BETA)< Line 809  Web Document Conformance Checker (BETA)<
809    
810            <p>Any inline-level content must be put            <p>Any inline-level content must be put
811            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
812        <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>,
813        such as <code>div</code>, <code>h<var>n</var></code>, or        <code>div</code>, <code>h<var>n</var></code>,
814        <code>section</code></dt>        <code>p</code>, or <code>section</code></dt>
815            <dd><p>Though some elements such as <code>div</code>,            <dd><dl class="switch">
816            <code>li</code>, and <code>td</code> allow                <dt>If the parent element is <code>div</code>,
817            <em>either one</em> of block-level or inline-level content                <code>li</code>, <code>td</code>, or <code>th</code></dt>
818            is allowed.  If there is a block-level content,                <!-- @@ TODO: more... -->
819            any inline-level content must be put                    <!-- @@ TODO: <p><ul><li><p> -->
820            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <dd><p>The parent element allows <em>either</em>
821                      block-level or inline-level content.  If there is a
822                      block-level content, any inline-level content must be
823                      put in e.g. paragraph element such as <code>p</code>.</p>
824                      <p>For example, an HTML document fragment
825                      <code class="html bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
826                      is non-conforming, since a word <q>World!</q> does not belong
827                      to any paragraph.  (If not part of any paragraph, what is
828                      it!?)  A conforming example would be:
829                        <pre class="html example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
830                      </p></dd>
831                  <dt>If the parent element does <em>not</em> allow
832                  block-level elements as content</dt>
833                      <dd>The element is not allowed to be inserted here.
834                      For example, a <code>div</code> element cannot be
835                      a child of an <code>h1</code> element.</dd>
836              </dl></dd>
837        <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>
838            <dd>The <code>noscript</code> element is allowed only in the context            <dd>The <code>noscript</code> element is allowed only in the context
839            where a block-level or inline-level content is expected            where a block-level or inline-level content is expected
840            and in the <code>head</code> element.            and in the <code>head</code> element.
841            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>,
842            or <code>select</code>.</dd>            or <code>select</code>.</dd>
843        <dt>If the element with the error is the <code>html</code> element        <dt>If the element with the error is <code>blink</code>,
844        that is the root element of an XHTML document</dt>        <code>center</code>, or <code>marquee</code> element</dt>
845            <dd><p>In an XHTML document, the root <code>html</code>            <dd>These elements are not part of the HTML standard.
846            element must have an <code>xmlns</code> attribute            Use CSS for styling control.</dd>
847            whose value is set to  
848            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>        <dt><code>button</code>, <code>datalist</code>,
849          <code>fieldset</code>, <code>form</code>,
850          <code>input</code>, <code>label</code>,
851          <code>optgroup</code>, <code>option</code>, <code>output</code>,
852          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
853          <code>textarea</code>, or <code>textarea</code> element</dt>
854          <!-- rbc, rtc ? -->
855              <dd>These elements are intentionally not supported by the conformance
856              checker <em>yet</em>.</dd>
857        </dl>        </dl>
858      </p>      </p>
859    </d:desc>    </d:desc>
860  </d:item>  </d:item>
861    
862    <d:item name="element not allowed:root"
863        class="content-model-error">
864      <d:message xml:lang="en">This element is not allowed as a root
865      element.</d:message>
866      <d:desc xml:lang="en">
867        <p>An element that is not allowed as the root element
868        is used as the root element of the document.  The document is
869        non-conforming, as far as the conformance checker can tell.</p>
870    
871        <dl class="switch">
872        <dt><code>html</code> element in an XHTML document</dt>
873            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
874            element must have an <code>xmlns</code> attribute as:
875              <pre class="xml example"><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"></code></pre></p></dd>
876        <dt><code>rss</code> element</dt>
877            <dd><p>The document is written in some version of RSS.</p>
878            <p>The conformance checker does not support any version
879            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
880        <dt><code>feed</code> element</dt>
881            <dd><p>The Atom <code>feed</code> element must be
882            in the <code>http://www.w3.org/2005/Atom</code>
883            namespace as:
884              <pre class="xml example"><code>&lt;feed xmlns="http://www.w3.org/2005/Atom"></code></pre>
885            </p>
886            <p>The conformance checker does not support Atom 0.3.
887            Use Atom 1.0 for feed documents.</p></dd>
888        </dl>
889      </d:desc>
890    </d:item>
891    
892  <d:item name="ps element missing"  <d:item name="ps element missing"
893      class="content-model-error">      class="content-model-error">
894    <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 545  Web Document Conformance Checker (BETA)< Line 916  Web Document Conformance Checker (BETA)<
916      is non-conforming.</p>      is non-conforming.</p>
917    
918      <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.  
919      Without required attributes specified, user agents      Without required attributes specified, user agents
920      cannot provide the full functionality of the element      cannot provide full functionality of the element to the user.</p>
921      to the user.</p>  
922        <dl class="switch">
923        <dt>HTML <code>img</code> element</dt>
924            <dd>The <code>src</code> attribute must be specified.
925            Additionally, the <code>alt</code> attribute must be specified
926            in many cases.</dd>
927        <dt>HTML <code>link</code> element</dt>
928            <dd>The <code>rel</code> attribute must be specified.
929            Note that the <code>rev</code> attribute is obsolete.</dd>
930        </dl>
931      </d:desc>
932    </d:item>
933    
934    <d:item name="attribute not allowed" class="attribute-error">
935      <d:message xml:lang="en">Attribute
936      <code><var>{local-name}</var></code> is not allowed for
937      <code><var>{element-local-name}</var></code> element.</d:message>
938      <d:desc xml:lang="en">
939        <p>An attribute is specified where it is not allowed.
940        The document is non-conforming.</p>
941    
942        <dl>
943        <dt>HTML <code>meta</code> element</dt>
944            <dd>For HTML <code>meta</code> element, <em>only one</em> of
945            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
946            attribute is allowed.</dd>
947        </dl>
948    </d:desc>    </d:desc>
949  </d:item>  </d:item>
950    
# Line 557  Web Document Conformance Checker (BETA)< Line 952  Web Document Conformance Checker (BETA)<
952      class="attribute-error">      class="attribute-error">
953    <d:message xml:lang="en">The <code>xml:lang</code> attribute is not    <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
954    allowed in HTML document.</d:message>    allowed in HTML document.</d:message>
955    <d:desc>    <d:desc xml:lang="en">
956      <p>The <code>xml:lang</code> attribute is not allowed in      <p>The <code>xml:lang</code> attribute is not allowed in
957      HTML document.  The document is non-conforming.</p>      HTML document.  The document is non-conforming.</p>
958    
959      <p>The <code>lang</code> attribute in the <code>null</code>      <p>Use of the <code>xml:lang</code> attribute is conforming
960      namespace for HTML elements is defined as conforming <em>only</em> for      <em>only</em> in XML documents.</p>
     XML document.</p>  
961    
962      <p>To specify natural language information in HTML document,      <p>To specify natural language information in HTML document,
963      use <code>lang</code> attribute instead.</p>      use <code>lang</code> attribute instead.</p>
# Line 604  Web Document Conformance Checker (BETA)< Line 998  Web Document Conformance Checker (BETA)<
998      XML document.  The document is non-conforming.</p>      XML document.  The document is non-conforming.</p>
999    
1000      <p>The <code>lang</code> attribute in <code>null</code>      <p>The <code>lang</code> attribute in <code>null</code>
1001      namespace for HTML elements is defined as conforming <em>only</em> for      namespace for HTML elements is conforming <em>only</em> in
1002      HTML document.</p>      HTML documents.</p>
1003    
1004      <p>To specify natural language information in XML document,      <p>To specify natural language information in XML document,
1005      use <code>xml:lang</code> attribute instead.</p>      use <code>xml:lang</code> attribute instead.</p>
# Line 621  Web Document Conformance Checker (BETA)< Line 1015  Web Document Conformance Checker (BETA)<
1015      <p>The <code>xmlns</code> attribute in the <code>null</code>      <p>The <code>xmlns</code> attribute in the <code>null</code>
1016      namespace is not allowed in XHTML document.</p>      namespace is not allowed in XHTML document.</p>
1017    
1018      <p>This error should not occur in conformance-checking      <p>This error should not occur in conformance-checking of
1019      static documents.</p>      static documents.</p>
1020    </d:desc>    </d:desc>
1021  </d:item>  </d:item>
# Line 631  Web Document Conformance Checker (BETA)< Line 1025  Web Document Conformance Checker (BETA)<
1025  <section id="attribute-value-errors">  <section id="attribute-value-errors">
1026  <h2>Attribute Value Errors</h2>  <h2>Attribute Value Errors</h2>
1027    
1028    <d:item name="charset:not registered" class="attribute-value-warning warning"
1029        level="w">
1030      <d:message xml:lang="en">Character encoding name <code><var>$0</var></code>
1031      is not registered.</d:message>
1032      <d:desc xml:lang="en">
1033        <p>The specified character encoding name is not registered to
1034        <abbr>IANA</abbr>.  Use of registered character encoding name
1035        is a good practice to facilitate interoperability.</p>
1036    
1037        <dl class="switch">
1038        <dt><code>EUC-TW</code></dt>
1039          <dd><code>EUC-TW</code> is not registered.  Unfortunately, there
1040          is no registered name for that character encoding.  Use
1041          Big5 encoding with character encoding name <code>Big5</code>
1042          if it is enough to represent the document.</dd>
1043        <dt><code>ISO-2022-JP-1</code></dt>
1044          <dd><code>ISO-2022-JP-1</code> is not registered, nevertheless
1045          this character encoding name is documented in
1046          <a href="urn:ietf:rfc:2237"><abbr>RFC</abbr> 2237</a>.  Use
1047          <code>ISO-2022-JP-2</code> instead, since that character encoding
1048          is a superset of ISO-2022-JP-1.</dd>
1049        <dt><code>ISO-2022-JP-3</code>, <code>ISO-2022-JP-3-plane1</code></dt>
1050          <dd>These names are not registered and obsoleted in favor of
1051          <code>ISO-2022-JP-2004</code> and
1052          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1053        <dt><code>ISO-2022-JP-2003</code>,
1054        <code>ISO-2022-JP-2003-plane1</code></dt>
1055          <dd>These names are not registered and corrected to
1056          <code>ISO-2022-JP-2004</code> and
1057          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1058        <dt><code>ISO-2022-JP-2004</code>,
1059        <code>ISO-2022-JP-2004-plane1</code></dt>
1060          <dd>These names are not registered.  Unfortunately, there is
1061          no registered name for these character encodings.</dd>
1062        <dt><code>UTF-8N</code></dt>
1063          <dd><code>UTF-8N</code> is not registered.  Character encoding
1064          name <code>UTF-8</code> represents UTF-8 encoding with or
1065          without <abbr>BOM</abbr>.</dd>
1066        </dl>
1067    
1068        <p><strong>WARNING</strong>: This error might be raised for
1069        a registered character encoding name, since the character encoding
1070        name database of the conformance checker is not complete yet.</p>
1071      </d:desc>
1072    </d:item>
1073    
1074    <d:item name="charset:private" class="attribute-value-warning warning"
1075        level="w">
1076      <d:message xml:lang="en"><code><var>$0</var></code> is a private
1077      character encoding name.</d:message>
1078      <d:desc xml:lang="en">
1079        <p>The specified character encoding name is a private name and
1080        not registered to <abbr>IANA</abbr>.  Use of registered character
1081        encoding name is a good practice to facilitate interoperability.</p>
1082    
1083        <dl class="switch">
1084        <dt><code>x-euc-jp</code></dt>
1085          <dd>Use <code>EUC-JP</code> for the Japanese <abbr>EUC</abbr>
1086          character encoding.</dd>
1087        <dt><code>x-sjis</code></dt>
1088          <dd>Use <code>Shift_JIS</code> for standard Shift encoding scheme of
1089          <abbr>JIS</abbr> coded character set, or <code>Windows-31J</code>
1090          for Microsoft standard character set as implemented by
1091          Microsoft Windows.</dd>
1092        </dl>
1093      </d:desc>
1094    </d:item>
1095    
1096    <d:item name="charset:syntax error" class="attribute-value-error"
1097        level="m">
1098      <d:message xml:lang="en">The specified value is syntactically not a
1099      character encoding name.</d:message>
1100      <d:desc xml:lang="en">
1101        <p>The attribute value must be a character encoding name.  However,
1102        the specified value is not a character encoding name syntactically.
1103        The document is non‐conforming.</p>
1104        <p>Character encoding name is a string of <abbr>ASCII</abbr>
1105        printable characters, up to 40 characters.</p>
1106      </d:desc>
1107    </d:item>
1108    
1109  <d:item name="enumerated:invalid"  <d:item name="enumerated:invalid"
1110      class="attribute-value-error">      class="attribute-value-error">
1111    <d:message xml:lang="en">This attribute only allow a limited set of    <d:message xml:lang="en">This attribute only allow a limited set of
1112    values and the specified value <code><var>{@}</var></code> is not one    values and the specified value <code><var>{@}</var></code> is not one
1113    of them.</d:message>    of them.</d:message>
1114      <d:desc xml:lang="en">
1115        <p>For this attribute only several values are allowed and the
1116        value of the attribute is not one of them.  The document
1117        is non-conforming.</p>
1118    
1119        <dl>
1120        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
1121            <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
1122            are allowed.</p>
1123            <p>Value <code>Content-Type</code> is obsolete; for charset
1124            declaration, the <code>charset</code> attribute can be used as:
1125            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1126            ... where <var>charset-name</var> is a name of the character encoding
1127            of the document, such as <code>utf-8</code>.</p>
1128            <p>Values <code>Content-Style-Type</code> and
1129            <code>Content-Script-Type</code> are currently not allowed.</p>
1130            <p>Value <code>Keywords</code> is not allowed.  Use
1131            <code>name</code> attribute instead of <code>http-equiv</code>
1132            attribute.</p>
1133            <p>Values <code>Expires</code>, <code>Pragma</code>,
1134            and <code>Cache-Control</code> are not allowed;
1135            use <em>real</em> HTTP header fields for cache control.</p></dd>
1136        </dl>
1137      </d:desc>
1138    </d:item>
1139    
1140    <d:item name="enumerated:invalid:http-equiv:content-type"
1141        class="attribute-value-error">
1142      <d:message xml:lang="en">Character encoding declaration syntax
1143      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1144      is obsolete.</d:message>
1145      <d:desc xml:lang="en">
1146        <p>Old long character encoding declaration syntax
1147        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1148        is in use.  The document is non‐conforming.</p>
1149    
1150        <p>The new character encoding declaration syntax is:
1151          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1152        </p>
1153      </d:desc>
1154  </d:item>  </d:item>
1155    
1156  <d:item name="duplicate ID"  <d:item name="duplicate ID"
# Line 670  Web Document Conformance Checker (BETA)< Line 1185  Web Document Conformance Checker (BETA)<
1185      <p>The specified link type is non-conforming, and therefore      <p>The specified link type is non-conforming, and therefore
1186      the document is non-conforming.</p>      the document is non-conforming.</p>
1187    
1188      <dl>      <dl class="switch">
1189      <dt>Link type <code>contents</code></dt>      <dt>Link type <code>contents</code></dt>
1190        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1191      <dt>Link type <code>copyright</code></dt>      <dt>Link type <code>copyright</code></dt>
1192        <dd>Use link type <code>license</code>.</dd>        <dd>Use link type <code>license</code>.</dd>
1193      <dt>Link type <code>home</code></dt>      <dt>Link type <code>home</code></dt>
1194        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1195        <dt>Link type <code>previous</code></dt>
1196          <dd>Use link type <code>prev</code>.</dd>
1197      <dt>Link type <code>start</code></dt>      <dt>Link type <code>start</code></dt>
1198        <dd>Use link type <code>first</code>.</dd>        <dd>Use link type <code>first</code>.</dd>
1199      <dt>Link type <code>toc</code></dt>      <dt>Link type <code>toc</code> or <code>top</code></dt>
1200        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1201      </dl>      </dl>
1202    </d:desc>    </d:desc>
1203  </d:item>  </d:item>
1204    
1205    <d:item name="mismatched charset name" class="attribute-value-error"
1206        level="m">
1207      <d:message xml:lang="en">Character encoding name <code><var>$1</var></code>
1208      is different from document character encoding
1209      <code><var>$0</var></code>.</d:message>
1210      <d:desc xml:lang="en">
1211        <p>The specified character encoding name is different from
1212        the character encoding of the document.  The document
1213        is non‐conforming.</p>
1214      </d:desc>
1215    </d:item>
1216    
1217  <d:item name="reserved browsing context name"  <d:item name="reserved browsing context name"
1218      class="attribute-value-error">      class="attribute-value-error">
1219    <d:message xml:lang="en">Browsing context name    <d:message xml:lang="en">Browsing context name
# Line 722  Web Document Conformance Checker (BETA)< Line 1251  Web Document Conformance Checker (BETA)<
1251    
1252      <p><strong>Warning</strong>: The data served to the      <p><strong>Warning</strong>: The data served to the
1253      conforming checker might be out of date; it might have already      conforming checker might be out of date; it might have already
1254      been accepted or rejected, depending on which the document      been accepted or rejected.  The document might or might not be
1255      might be conforming or non-conforming.  See WHATWG Wiki      conforming depending on the status.  See WHATWG Wiki
1256      for the latest information.</p>      for the latest information.</p>
1257    </d:desc>    </d:desc>
1258  </d:item>  </d:item>
# Line 758  Web Document Conformance Checker (BETA)< Line 1287  Web Document Conformance Checker (BETA)<
1287      The document is non-conforming.</p>      The document is non-conforming.</p>
1288    
1289      <p>For example, the table below is non-conforming:      <p>For example, the table below is non-conforming:
1290        <pre class="html non-conforming example"><code>&lt;table>        <pre class="html bad example"><code>&lt;table>
1291  &lt;tbody>  &lt;tbody>
1292  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
1293  &lt;/tbody>  &lt;/tbody>
1294  &lt;/table></code></pre>  &lt;/table></code></pre>
1295      ... is non-conforming, since the second row contains only      ... since the second row contains only
1296      a cell that spans the first and the second rows.</p>      a cell that spans between first and second rows.</p>
1297    </d:desc>    </d:desc>
1298  </d:item>  </d:item>
1299    
# Line 777  Web Document Conformance Checker (BETA)< Line 1306  Web Document Conformance Checker (BETA)<
1306      class="should" level="s">      class="should" level="s">
1307    <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>
1308    subtype is used.</d:message>    subtype is used.</d:message>
1309      <d:item xml:lang="en">
1310        <p>The specified Internet Media Type is registered with status
1311        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
1312        
1313        <dl class="swtich">
1314        <dt>Media type <code>text/ecmascript</code></dt>
1315          <dd>Media type <code>text/ecmascript</code> is obsoleted in
1316          favor of <code>application/ecmascript</code>.  Note that
1317          <code>text/javascript</code> would be better alternative
1318          for many cases.</dd>
1319        <dt>Media type <code>text/javascript</code></dt>
1320          <dd>Media type <code>text/javascript</code> is obsoleted by
1321          <abbr>IETF</abbr> with backward incompatible alternate
1322          <code>application/javascript</code> for architectural
1323          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
1324        </dl>
1325      </d:item>
1326  </d:item>  </d:item>
1327    
1328  <d:item name="IMT:private subtype"  <d:item name="IMT:private subtype"
# Line 818  Web Document Conformance Checker (BETA)< Line 1364  Web Document Conformance Checker (BETA)<
1364    
1365  </section>  </section>
1366    
1367  <section id="uri-warnings">  <section id="uri-shoulds">
1368  <h2>URI (or IRI) Warnings</h2>  <h2>URI (or IRI) Should-level Errors</h2>
1369    
1370  <d:item name="URI::dot-segment"  <d:item name="URI::dot-segment"
1371      class="should" level="s">      class="should" level="s">
1372    <d:message xml:lang="en">Dot-segment (<code>.</code> or    <d:message xml:lang="en">A dot-segment (<code>.</code> or
1373    <code>..</code>) should not occur in an absolute reference.</d:message>    <code>..</code>) occurs in an absolute reference.</d:message>
1374    <d:desc>    <d:desc>
1375      <p>Dot-segment (<code>.</code> or <code>..</code>) should      <p>Dot-segment (<code>.</code> or <code>..</code>) should
1376      not occur in an absolute reference.</p>      not occur in an absolute reference.</p>
# Line 839  Web Document Conformance Checker (BETA)< Line 1385  Web Document Conformance Checker (BETA)<
1385    
1386  <d:item name="URI::empty path"  <d:item name="URI::empty path"
1387      class="should" level="s">      class="should" level="s">
1388    <d:message xml:lang="en">This IRI should explicitly end with    <d:message xml:lang="en">This IRI does not end with
1389    <code>/</code>.</d:message>    a <code>/</code>.</d:message>
1390      <d:item xml:lang="en">
1391        <p>The IRI does not end with a <code>/</code>.  If there is an
1392        authority component in an IRI, a <code>/</code> should be present
1393        instead of empty path component.</p>
1394    
1395        <p>For example, <code>http://www.example.com<strong>/</strong></code>
1396        is preferred to <code>http://www.example.com</code>.</p>
1397      </d:item>
1398  </d:item>  </d:item>
1399    
1400  <d:item name="URI::lowercase hexadecimal digit"  <d:item name="URI::lowercase hexadecimal digit"
1401      class="should" level="s">      class="should" level="s">
1402    <d:message xml:lang="en">Hexadecimal digit in percent-encoding    <d:message xml:lang="en">A lowercase hexadecimal digit is used
1403    should be in lowercase.</d:message>    in percent-encoding.</d:message>
1404    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1405      <p>The hexadecimal digit in percent-encoding string in the IRI      <p>The hexadecimal digit in percent-encoding string in the IRI
1406      is in lowercase.  Though the IRI <em>is</em> conforming,      is in lowercase.  Though the IRI <em>is</em> conforming,
# Line 887  Web Document Conformance Checker (BETA)< Line 1441  Web Document Conformance Checker (BETA)<
1441    
1442  </section>  </section>
1443    
1444    <section id="cache-manifest-errors">
1445    <h2>Cache Manifest Errors</h2>
1446    
1447    <d:item name="not manifest" class="must" level="m">
1448      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
1449      <d:desc xml:lang="en">
1450        <p>The specified document is <em>not</em> a cache manifest.
1451        The document is non-conforming.</p>
1452    
1453        <p>An entity labeled as Internet media type
1454        <code>text/cache-manifest</code> must contain a cache manifest.</p>
1455    
1456        <p>A cache manifest must start with a line whose content is
1457        <code class="manifest example">CACHE MANIFEST</code>
1458        (exactly one space character between
1459        <code>CACHE</code> and <code>MANIFEST</code>).</p>
1460      </d:desc>
1461    </d:item>
1462    </section>
1463    
1464    <section id="information">
1465    <h2>Stability Information</h2>
1466    
1467    <d:item name="status:cr:element" class="level-i" level="i">
1468      <d:message xml:lang="en">This element is in the
1469      <strong>call for implementation</strong> stage.</d:message>
1470      <d:desc xml:lang="en">
1471        <p>The element is in the call for implementation stage.</p>
1472        
1473        <p>Usually, using the element is safe.  However, it is a new feature
1474        so that it might not be implemented correctly.  If it is found that
1475        the feature is hard or impossible to implement, the feature
1476        might be revised, or in some case it might be dropped.</p>
1477    
1478        <p>Elements defined by Atom 1.0 (IETF Proposed Standard), and XBL 2.0
1479        (W3C Candidate Recommendation) belong to this class.</p>
1480      </d:desc>
1481    </d:item>
1482    
1483    <d:item name="status:lc:element" class="level-i" level="i">
1484      <d:message xml:lang="en">This element is in the <strong>last
1485      call for comments</strong> stage.</d:message>
1486      <d:desc xml:lang="en">
1487        <p>The element is in the last call for comments stage.</p>
1488        
1489        <p>The element is relatively mature, though the standardization
1490        is not done yet.  It may be used for experiments.  Since it is a new
1491        feature, it might not be implemented correctly or at all.  If it is
1492        found that the feature is hard or impossible to implement, the feature
1493        might be revised or might be dropped.</p>
1494    
1495        <p>Elements defined by Web Forms 2.0 as well as some elements
1496        defined by HTML5 belong to this class.</p>
1497      </d:desc>
1498    </d:item>
1499    
1500    <d:item name="status:wd:element" class="level-i" level="i">
1501      <d:message xml:lang="en">This element is documented in a <strong>working
1502      draft</strong>.</d:message>
1503      <d:desc xml:lang="en">
1504        <p>The element is documented in a working or editor's draft
1505        and not yet completed.</p>
1506        
1507        <p>The element should not be used for any practical purpose.
1508        The feature might be drastically changed later or might be
1509        entirely removed.</p>
1510    
1511        <p>Most of new elements defined by HTML5 belong to this class.</p>
1512      </d:desc>
1513    </d:item>
1514    
1515    <d:item name="status:non-standard:element" class="level-i" level="i">
1516      <d:message xml:lang="en">This element is <strong>not part of any
1517      standard</strong> the conformance checker knows.</d:message>
1518      <d:desc xml:lang="en">
1519        <p>The element is not part of any standard or draft the conformance
1520        checker is aware of.</p>
1521        
1522        <p>The element should not be used for any practical purpose unless
1523        there is really a standard that defines the element.</p>
1524      </d:desc>
1525    </d:item>
1526    </section>
1527    
1528  <section id="unsupported-messages">  <section id="unsupported-messages">
1529  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1530    
1531  <d:item name="attribute"  <d:item name="element"
1532      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1533    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1534    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
1535      might not be conforming</em>.</d:message>
1536    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1537      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1538      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1539    </d:desc>    </d:desc>
1540  </d:item>  </d:item>
1541    
1542  <d:item name="element"  <d:item name="attribute"
1543      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1544    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1545    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1546      <code><var>{element-local-name}</var></code> is not supported;
1547      <em>it might or might not be conforming</em>.</d:message>
1548    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1549      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
1550      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1551    </d:desc>    </d:desc>
1552  </d:item>  </d:item>
1553    
1554  <d:item name="link type"  <d:item name="link type"
1555      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1556    <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
1557    standardized or registered at the time of the release of the conformance    standardized or registered at the time of the release of the conformance
1558    checker; <em>it is non-conforming unless it has now been    checker; <em>it is non-conforming unless it now has been
1559    registered</em>.</d:message>    registered</em>.</d:message>
1560    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1561      <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 927  Web Document Conformance Checker (BETA)< Line 1568  Web Document Conformance Checker (BETA)<
1568      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1569      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1570      document is non-conforming.</p>      document is non-conforming.</p>
1571    
1572        <dl>
1573        <dt>Link types <code>shortcut icon</code></dt>
1574            <dd>Link type <code>shortcut</code> is not registered.
1575            Use only <code>icon</code> for linking to so-called favicon.</dd>
1576        </dl>
1577    </d:desc>    </d:desc>
1578  </d:item>  </d:item>
1579    
# Line 936  Web Document Conformance Checker (BETA)< Line 1583  Web Document Conformance Checker (BETA)<
1583    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>
1584  </d:item>  </d:item>
1585    
 <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>  
   
1586  <d:item name="media query"  <d:item name="media query"
1587      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1588    <d:message xml:lang="en">Conformance checking for media query    <d:message xml:lang="en">Conformance checking for media query
# Line 964  Web Document Conformance Checker (BETA)< Line 1605  Web Document Conformance Checker (BETA)<
1605    
1606  </section>  </section>
1607    
1608  <d:catalog>  <d:cat name="WebHACC:Title">
1609  manakaiCompatMode:quirks;;Quirks Mode    <d:text xml:lang="en">WebHACC (β)</d:text>
1610  manakaiCompatMode:limited quirks;;Limited Quirks Mode  </d:cat>
1611  manakaiCompatMode:no quirks;;No Quirks Mode  
1612    <d:cat name="WebHACC:Heading">
1613  manakaiIsHTML:1;;HTML Document    <d:text xml:lang="en">
1614  manakaiIsHTML:0;;XML Document      <a href="../cc-about"><abbr title="Web Hypertext Application Conformance Checker (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
1615  </d:catalog>    </d:text>
1616      <d:text xml:lang="ja">
1617        <a href="../cc-about"><abbr title="Web ハイパーテキスト応用適合性検査器 (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
1618      </d:text>
1619    </d:cat>
1620    
1621    <d:cat name="Information">
1622      <d:text xml:lang="en">Information</d:text>
1623      <d:text xml:lang="ja">情報</d:text>
1624    </d:cat>
1625    
1626    <d:cat name="HTTP Header">
1627      <d:text xml:lang="en"><abbr title="Hypertext Transfer Protocol">HTTP</abbr>
1628          Header</d:text>
1629      <d:text xml:lang="ja"><abbr lang="en" title="Hypertext Transfer Protocol">HTTP</abbr>
1630          頭部</d:text>
1631    </d:cat>
1632    
1633    <d:cat name="Parse Errors Section">
1634      <d:text xml:lang="en">Parse Errors</d:text>
1635      <d:text xml:lang="ja">構文誤り</d:text>
1636    </d:cat>
1637    
1638    <d:cat name="Parse Errors">
1639      <d:text xml:lang="en">Parse Errors</d:text>
1640      <d:text xml:lang="ja">構文誤り</d:text>
1641    </d:cat>
1642    
1643    <d:cat name="Document Source">
1644      <d:text xml:lang="en">Document Source</d:text>
1645      <d:text xml:lang="ja">文書のソース</d:text>
1646    </d:cat>
1647    
1648    <d:cat name="Source">
1649      <d:text xml:lang="en">Source</d:text>
1650      <d:text xml:lang="ja">ソース</d:text>
1651    </d:cat>
1652    
1653    <d:cat name="Tables Section">
1654      <d:text xml:lang="en">Structure of Tables</d:text>
1655      <d:text xml:lang="ja">表の構造</d:text>
1656    </d:cat>
1657    
1658    <d:cat name="Tables">
1659      <d:text xml:lang="en">Tables</d:text>
1660      <d:text xml:lang="ja">表</d:text>
1661    </d:cat>
1662    
1663    <d:cat name="Document Tree">
1664      <d:text xml:lang="en">Document Tree</d:text>
1665      <d:text xml:lang="ja">文書木</d:text>
1666    </d:cat>
1667    
1668    <d:cat name="Tree">
1669      <d:text xml:lang="en">Tree</d:text>
1670      <d:text xml:lang="ja">木</d:text>
1671    </d:cat>
1672    
1673    <d:cat name="Document">
1674      <d:text xml:lang="en">Document</d:text>
1675      <d:text xml:lang="ja">文書</d:text>
1676    </d:cat>
1677    
1678    <d:cat name="Document Structure">
1679      <d:text xml:lang="en">Document Structure</d:text>
1680      <d:text xml:lang="ja">文書構造</d:text>
1681    </d:cat>
1682    
1683    <d:cat name="Structure">
1684      <d:text xml:lang="en">Structure</d:text>
1685      <d:text xml:lang="ja">構造</d:text>
1686    </d:cat>
1687    
1688    <d:cat name="Reformatted Document Source">
1689      <d:text xml:lang="en">Reformatted Document Source</d:text>
1690      <d:text xml:lang="ja">再整形した文書のソース</d:text>
1691    </d:cat>
1692    
1693    <d:cat name="Reformatted">
1694      <d:text xml:lang="en">Reformatted</d:text>
1695      <d:text xml:lang="ja">再整形</d:text>
1696    </d:cat>
1697    
1698    <d:cat name="Structural Errors">
1699      <d:text xml:lang="en">Structural Errors</d:text>
1700      <d:text xml:lang="ja">構造的誤り</d:text>
1701    </d:cat>
1702    
1703    <d:cat name="Struct. Errors">
1704      <d:text xml:lang="en">Struct. Errors</d:text>
1705      <d:text xml:lang="ja">構造誤り</d:text>
1706    </d:cat>
1707    
1708    <d:cat name="manakaiCompatMode:quirks">
1709      <d:text xml:lang="en">Quirks Mode</d:text>
1710      <d:text xml:lang="ja">奇癖モード</d:text>
1711    </d:cat>
1712    
1713    <d:cat name="manakaiCompatMode:limited quirks">
1714      <d:text xml:lang="en">Limited Quirks Mode</d:text>
1715      <d:text xml:lang="ja">限定奇癖モード</d:text>
1716    </d:cat>
1717    
1718    <d:cat name="manakaiCompatMode:no quirks">
1719      <d:text xml:lang="en">No Quirks Mode</d:text>
1720      <d:text xml:lang="ja">無奇癖モード</d:text>
1721    </d:cat>
1722    
1723    <d:cat name="manakaiIsHTML:1">
1724      <d:text xml:lang="en">HTML Document</d:text>
1725      <d:text xml:lang="ja">HTML 文書</d:text>
1726    </d:cat>
1727    
1728    <d:cat name="manakaiIsHTML:0">
1729      <d:text xml:lang="en">XML Document</d:text>
1730      <d:text xml:lang="ja">XML 文書</d:text>
1731    </d:cat>
1732    
1733    <d:cat name="manakaiCharset">
1734      <d:text xml:lang="en"><code>charset</code> parameter</d:text>
1735      <d:text xml:lang="ja"><code lang="en">charset</code> 引数</d:text>
1736    </d:cat>
1737    
1738    <d:cat name="inputEncoding">
1739      <d:text xml:lang="en">Input character encoding</d:text>
1740      <d:text xml:lang="ja">入力に用いた文字符号化</d:text>
1741    </d:cat>
1742    
1743    <d:cat name="xmlVersion">
1744      <d:text xml:lang="en">XML <code>version</code></d:text>
1745      <d:text xml:lang="ja">XML <code lang="en">version</code></d:text>
1746    </d:cat>
1747    
1748    <d:cat name="xmlEncoding">
1749      <d:text xml:lang="en">XML <code>encoding</code></d:text>
1750      <d:text xml:lang="ja">XML <code lang="en">encoding</code></d:text>
1751    </d:cat>
1752    
1753    <d:cat name="xmlStandalone">
1754      <d:text xml:lang="en">XML <code>standalone</code></d:text>
1755      <d:text xml:lang="ja">XML <code lang="en">standalone</code></d:text>
1756    </d:cat>
1757    
1758    <d:cat name="... with BOM">
1759      <d:text xml:lang="en"> (with <code class="charname"><abbr title="BYTE ORDER MARK">BOM</abbr></code>)</d:text>
1760      <d:text xml:lang="ja"> (<code class="charname" lang="en"><abbr title="BYTE ORDER MARK">BOM</abbr></code> つき)</d:text>
1761    </d:cat>
1762    
1763    <d:cat name="URL">
1764      <d:text xml:lang="en"><abbr title="Uniform Resource Locator">URL</abbr></d:text>
1765      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
1766    </d:cat>
1767    
1768    <d:cat name="URLs">
1769      <d:text xml:lang="en"><abbr title="Uniform Resource Locators">URLs</abbr></d:text>
1770      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
1771    </d:cat>
1772    
1773    <d:cat name="Container Node">
1774      <d:text xml:lang="en">Container Node</d:text>
1775      <d:text xml:lang="ja">この文書を含む節点</d:text>
1776    </d:cat>
1777    
1778    <d:cat name="Table Element">
1779      <d:text xml:lang="en">Table Element</d:text>
1780      <d:text xml:lang="ja">表要素</d:text>
1781    </d:cat>
1782    
1783    <d:cat name="Base URL">
1784      <d:text xml:lang="en">Base URL</d:text>
1785      <d:text xml:lang="ja">基底 URL</d:text>
1786    </d:cat>
1787    
1788    <d:cat name="Internet Media Type">
1789      <d:text xml:lang="en">Internet Media Type</d:text>
1790      <d:text xml:lang="ja">インターネット媒体型</d:text>
1791    </d:cat>
1792    
1793    <d:cat name="Character Encoding">
1794      <d:text xml:lang="en">Character Encoding</d:text>
1795      <d:text xml:lang="ja">文字符号化</d:text>
1796    </d:cat>
1797    
1798    <d:cat name="Byte Length">
1799      <d:text xml:lang="en">Byte Length</d:text>
1800      <d:text xml:lang="ja">バイト長</d:text>
1801    </d:cat>
1802    
1803    <d:cat name="Character Length">
1804      <d:text xml:lang="en">Character Length</d:text>
1805      <d:text xml:lang="ja">文字長</d:text>
1806    </d:cat>
1807    
1808    <d:cat name="... overridden">
1809      <d:text xml:lang="en"> (<i>overridden</i>)</d:text>
1810      <d:text xml:lang="ja"> (<i>上書き</i>)</d:text>
1811    </d:cat>
1812    
1813    <d:cat name="... overridden, official type is #">
1814      <d:text xml:lang="en"> (<i>overridden</i>; official type is
1815          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
1816      <d:text xml:lang="ja"> (<i>上書き</i>, 公式型は
1817          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
1818    </d:cat>
1819    
1820    <d:cat name="... sniffed">
1821      <d:text xml:lang="en"> (<i>sniffed</i>)</d:text>
1822      <d:text xml:lang="ja"> (<i>探知結果</i>)</d:text>
1823    </d:cat>
1824    
1825    <d:cat name="byte">
1826      <d:text xml:lang="en">byte</d:text>
1827      <d:text xml:lang="ja">バイト</d:text>
1828    </d:cat>
1829    
1830    <d:cat name="bytes">
1831      <d:text xml:lang="en">bytes</d:text>
1832      <d:text xml:lang="ja">バイト</d:text>
1833    </d:cat>
1834    
1835    <d:cat name="character">
1836      <d:text xml:lang="en">character</d:text>
1837      <d:text xml:lang="ja">文字</d:text>
1838    </d:cat>
1839    
1840    <d:cat name="characters">
1841      <d:text xml:lang="en">characters</d:text>
1842      <d:text xml:lang="ja">文字</d:text>
1843    </d:cat>
1844    
1845    <d:cat name="Line #">
1846      <d:text xml:lang="en">Line <var>{text}</var></d:text>
1847      <d:text xml:lang="ja"><var>{text}</var> 行</d:text>
1848    </d:cat>
1849    
1850    <d:cat name="column #">
1851      <d:text xml:lang="en">column <var>{text}</var></d:text>
1852      <d:text xml:lang="ja"><var>{text}</var> 列</d:text>
1853    </d:cat>
1854    
1855    <d:cat name="Index #">
1856      <d:text xml:lang="en">Index <var>{text}</var></d:text>
1857      <d:text xml:lang="ja">索引 #<var>{text}</var></d:text>
1858    </d:cat>
1859    
1860    <d:cat name="Table #">
1861      <d:text xml:lang="en">Structure of Table #<var>{text}</var></d:text>
1862      <d:text xml:lang="ja">表 #<var>{text}</var> の構造</d:text>
1863    </d:cat>
1864    
1865    <d:cat name="Subdocument #">
1866      <d:text xml:lang="en">Subdocument #<var>{text}</var></d:text>
1867      <d:text xml:lang="ja">部分文書 #<var>{text}</var></d:text>
1868    </d:cat>
1869    
1870    <d:cat name="Sub #">
1871      <d:text xml:lang="en">Sub #<var>{text}</var></d:text>
1872      <d:text xml:lang="ja">部分 #<var>{text}</var></d:text>
1873    </d:cat>
1874    
1875    <section id="levels">
1876    <h2>Error Levels</h2>
1877    
1878    <table id="levels-table">
1879    <thead>
1880    <tr><th scope="col">Level</th>
1881    <th scope="col">Conforming?</th>
1882    <th scope="col">Description</th>
1883    </tr>
1884    </thead>
1885    <tbody>
1886    <tr id="level-m" class="level-m">
1887    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
1888    <td>Non‐conforming.</td>
1889    <td>A violation to a hard requirement of the specification.
1890    The document is non‐conforming.</td>
1891    </tr>
1892    <tr id="level-s" class="level-s">
1893    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
1894    <td>Non‐conforming, but <em>in some case</em>
1895    conforming.</td>
1896    <td>A violation to a requirement of the specification.
1897    The violation might be legitimize in some case.  Otherwise,
1898    the document is non‐conforming.</td>
1899    </tr>
1900    <tr id="level-w" class="level-w">
1901    <th scope="row">Warning</th>
1902    <td>Conforming.</td>
1903    <td>A warning is an advice from the conformance checker to avoid
1904    to solve a problem in a confusing or possibly wrong way.
1905    It does not affect to the conformance of the document, and
1906    may sometimes be inappropriate.</td>
1907    </tr>
1908    <tr id="level-i" class="level-i">
1909    <th scope="row">Information</th>
1910    <td>Conforming.</td>
1911    <td>An informational message just provides an additional information
1912    on the feature used in the document or the status of the retrieval
1913    or so on.
1914    It does not affect to the conformance of the document.</td>
1915    </tr>
1916    <tr id="level-u" class="level-u">
1917    <th scope="row">Not supported</th>
1918    <td><em>Unknown</em>.</td>
1919    <td>Some feature that is not supported by the conformance checker
1920    is used in the document.</td>
1921    </tr>
1922    </tbody>
1923    </table>
1924    </section>
1925    
1926  <section id="license">  <section id="license">
1927  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1928    
1929  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>‐<time>2008</time>
1930  <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>
1931    <code class="mail">&lt;<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>></code>.</p>
1932    
1933    <p>This document is free software; you can redistribute it
1934  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1935  </section>  </section>
1936    
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