/[suikacvs]/test/html-webhacc/error-description-source.xml
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revision 1.4 by wakaba, Mon Jul 16 13:56:26 2007 UTC revision 1.13 by wakaba, Mon Nov 5 09:33:52 2007 UTC
# Line 28  Web Document Conformance Checker (BETA)< Line 28  Web Document Conformance Checker (BETA)<
28    </d:desc>    </d:desc>
29  </d:item>  </d:item>
30    
31    <d:item name="after body"
32        class="parse-error">
33      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
34      is not allowed after the end tag <code>&lt;/body></code>.</d:message>
35      <d:desc xml:lang="en">
36        <p>The start or end tag of an element appears after the
37        <code>body</code> element has been closed.  The document is
38        non-conforming.</p>
39    
40        <p>Any content of the document other than <code>head</code>
41        contents and comments must be put into the <code>body</code>
42        element.</p>
43      </d:desc>
44    </d:item>
45    
46  <d:item name="bare ero"  <d:item name="bare ero"
47      class="tokenize-error">      class="tokenize-error">
48    <d:message xml:lang="en">The <code>&amp;</code> character must    <d:message xml:lang="en">The <code>&amp;</code> character must
# Line 38  Web Document Conformance Checker (BETA)< Line 53  Web Document Conformance Checker (BETA)<
53      is not part of any reference appears in the input stream.      is not part of any reference appears in the input stream.
54      The document is non-conforming.</p>      The document is non-conforming.</p>
55    
56        <p><strong>Any <code>&amp;</code> character in URI (or IRI)
57        must be escaped as <code>&amp;amp;</code>.</strong></p>
58    
59      <p>The <code>&amp;</code> character must      <p>The <code>&amp;</code> character must
60      be the first character of a reference:      be the first character of a reference:
61        <dl>        <dl>
# Line 63  Web Document Conformance Checker (BETA)< Line 81  Web Document Conformance Checker (BETA)<
81    </d:desc>    </d:desc>
82  </d:item>  </d:item>
83    
84    <d:item name="bare etago"
85        class="tokenize-error">
86      <d:message xml:lang="en">A <code>&lt;/</code> string is not followed
87      by a tag name.</d:message><!-- </ EOF -->
88      <d:desc xml:lang="en">
89        <p>There is a <code>&lt;</code> (<code>U+003C</code>
90        <code class="charname">LESS-THAN SIGN</code>) character
91        immediately followed by a <code>/</code> (<code>U+005F</code>
92        <code>SOLIDUS</code>) character, which is not part
93        of any end tag, in the input stream.  The document
94        is non-conforming.</p>
95    
96        <p>The <code>&lt;/</code> sequence immediately followed
97        by an <abbr title="End of file pseudo-character">EOF</abbr> is
98        interpreted as a string data of <code>&lt;/</code>.</p>
99    
100        <p>The <code>&lt;/</code> sequence as string data must
101        be escaped as:
102        <pre class="html example"><code>&amp;lt;/</code></pre>
103        </p>
104      </d:desc>
105    </d:item>
106    
107  <d:item name="bare stago"  <d:item name="bare stago"
108      class="tokenize-error">      class="tokenize-error">
109    <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
110    by tag name or by a <code>!</code> character.</d:message>    by tag name or by a <code>!</code> character.</d:message>
111    <d:desc xml:lang="en">    <d:desc xml:lang="en">
112      <p>A <code>&lt;</code> (<code>U+003C</code> <code class="charname">LESS-THAN      <p>A <code>&lt;</code> (<code>U+003C</code>
113      SIGN</code>) character which is not part of any markup appears      <code class="charname">LESS-THAN SIGN</code>) character which is not part
114      in the input stream.</p>      of any markup appears in the input stream.</p>
115    
116      <p>The <code>&lt;</code> character as a data character must      <p>The <code>&lt;</code> character as a data character must
117      be escaped as:      be escaped as:
118      <pre class="html example"><code>&lt;lt;</code></pre>      <pre class="html example"><code>&amp;lt;</code></pre>
119      </p>      </p>
120    </d:desc>    </d:desc>
121  </d:item>  </d:item>
# Line 92  Web Document Conformance Checker (BETA)< Line 133  Web Document Conformance Checker (BETA)<
133      The document is non-conforming.</p>      The document is non-conforming.</p>
134    
135      <p>The string <code>&amp;#</code> must be the first two characters      <p>The string <code>&amp;#</code> must be the first two characters
     <code>NUMBER SIGN</code>) character must be the first two characters  
136      of a reference:      of a reference:
137        <dl>        <dl>
138        <dt>Numeric character reference</dt>        <dt>Numeric character reference</dt>
# Line 107  Web Document Conformance Checker (BETA)< Line 147  Web Document Conformance Checker (BETA)<
147      </p>      </p>
148    
149      <p>To represent <code>&amp;#</code> as data characters, use      <p>To represent <code>&amp;#</code> as data characters, use
150      named entity reference:      a named entity reference for the <code>&amp;</code> character:
151        <pre class="html example"><code>&amp;amp;#</code></pre>        <pre class="html example"><code>&amp;amp;#</code></pre>
152      </p>      </p>
153    </d:desc>    </d:desc>
# Line 129  Web Document Conformance Checker (BETA)< Line 169  Web Document Conformance Checker (BETA)<
169      of the code point of the character to be referenced.</p>      of the code point of the character to be referenced.</p>
170    
171      <p>To represent <code>&amp;#x</code> as data characters, use      <p>To represent <code>&amp;#x</code> as data characters, use
172      named entity reference:      a named entity reference for the <code>&amp;</code> character:
173        <pre class="html example"><code>&amp;amp;#x</code></pre>        <pre class="html example"><code>&amp;amp;#x</code></pre>
174      </p>      </p>
175    </d:desc>    </d:desc>
176  </d:item>  </d:item>
177    
178    <d:item name="bogus comment"
179        class="tokenize-error">
180      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
181      by <code>--</code>.</d:message>
182      <d:desc xml:lang="en">
183        <p>There is a <code>&lt;</code> (<code>U+003C</code>
184        <code class="charname">LESS-THAN SIGN</code>) character
185        followed by a <code>!</code> (<code>U+0021</code>
186        <code class="charname">EXCLAMATION MARK</code>) character,
187        which is not followed by a <code>--</code> or
188        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
189    
190        <dl class="switch">
191        <dt>Comments</dt>
192          <dd>In HTML documents, comments must be introduced by
193          <code>&lt;!--</code> (<code>&lt;!</code> <em>immediately</em> followed
194          by <em>two</em> <code>-</code>s) and must be terminated by
195          <code>--></code>.  Strings <code>&lt;!</code> not followed
196          by <code>--</code> and <code>&lt;!-</code> not followed by
197          <code>-</code> are not valid open delimiters for comments.</dd>
198        <dt>Marked sections, including <code>CDATA</code> sections</dt>
199          <dd>Marked sections are not allowed in HTML documents.</dd>
200        <dt>Markup declarations</dt>
201          <dd>Markup declarations, except <code>DOCTYPE</code>
202          and comment declarations, are not allowed in HTML documents.</dd>
203        <dt>String <code>&lt;!</code></dt>
204          <dd>String <code>&lt;!</code> must be escaped as
205          <code>&amp;lt;!</code>.</dd>
206        </dl>
207      </d:desc>
208    </d:item>
209    
210    <d:item name="bogus end tag"
211        class="tokenize-error">
212      <d:message xml:lang="en">String <code>&lt;/</code> is not followed
213      by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
214      <d:desc xml:lang="en">
215        <p>There is a <code>&lt;</code> (<code>U+003C</code>
216        <code class="charname">LESS-THAN SIGN</code>) character
217        immediately followed by a <code>/</code> (<code>U+005F</code>
218        <code>SOLIDUS</code>) character, which is not part
219        of any end tag, in the input stream.  The document
220        is non-conforming.</p>
221    
222        <p>The <code>&lt;/</code> sequence not followed by a
223        tag name is parsed as an opening of bogus comment.</p>
224    
225        <p>The <code>&lt;/</code> sequence as string data must
226        be escaped as:
227        <pre class="html example"><code>&amp;lt;/</code></pre>
228        </p>
229      </d:desc>
230    </d:item>
231    
232  <d:item name="dash in comment"  <d:item name="dash in comment"
233      class="tokenize-error">      class="tokenize-error">
234    <d:message xml:lang="en">There is a <code>--</code> sequence    <d:message xml:lang="en">There is a <code>--</code> sequence
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248    
249  <d:item name="duplicate attribute"  <d:item name="duplicate attribute"
250      class="tokenize-error">      class="tokenize-error">
251    <d:message xml:lang="en">There are two attributes with same name.</d:message>    <d:message xml:lang="en">There are two attributes with name
252          <code><var>$0</var></code>.</d:message>
253    <d:desc xml:lang="en">    <d:desc xml:lang="en">
254      <p>There are more than one attributes with the same      <p>There are more than one attributes with the same
255      name in a tag.  The document is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
# Line 166  Web Document Conformance Checker (BETA)< Line 261  Web Document Conformance Checker (BETA)<
261    
262  <d:item name="nestc"  <d:item name="nestc"
263      class="tokenize-error">      class="tokenize-error">
264    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be    <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
265    used for this element.</d:message>    used for this element.</d:message>
266    <d:desc xml:lang="en">    <d:desc xml:lang="en">
267      <p>Void element syntax (<code>/></code>) must not be used      <p>Polytheistic slash (<code>/></code>) must not be used
268      for the element.  The document is non-conforming.</p>      for the element.  The document is non-conforming.</p>
269    
270      <p>The void element syntax can only be      <p>The polytheistic slash can only be
271      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
272      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
273      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
274      <code>col</code>, and <code>input</code> elements.</p>      <code>col</code>, and <code>input</code> elements.</p>
275    
276      <p>Note that, unlike in XML, the void element syntax has      <dl class="switch">
277        <dt><code>&lt;script/></code></dt>
278            <dd><p>The polytheistic slash cannot be used for <code>script</code>
279            element.  Even for an empty <code>script</code> element,
280            there must be an explicit end tag <code>&lt;/script></code>.</p>
281    
282            <p><strong>NOTE</strong>: Though some user agents interpret
283            polytheistic slash for <code>script</code> element as the
284            closing of the element, such usage is not allowed under
285            the current standard.</p></dd>
286        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
287        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
288        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
289            <dd>These elements are themselves non-conforming.</dd>
290        <!-- isindex, image -->
291        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
292        <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
293            <dd>Future revision of HTML5 parsing algorithm is expected
294            to allow polytheistic slash for these elements.</dd>
295        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
296            <dd>These elements are not always empty and therefore
297            polytheistic slash is not allowed.</dd>
298        </dl>
299    
300        <p>Note that, unlike in XML, the polytheistic slash has
301      no effect in HTML.</p>      no effect in HTML.</p>
302    </d:desc>    </d:desc>
303  </d:item>  </d:item>
304    
305    
306    <d:item name="pio"
307        class="tokenize-error">
308      <d:message xml:lang="en">Processing instruction
309      (<code>&lt;?<var>...</var>></code>) cannot be used.</d:message>
310      <d:desc xml:lang="en">
311        <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
312        including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
313        and XML style sheet <abbr title="processing instruction">PI</abbr>
314        (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
315        in the HTML syntax.  The document is non-conforming.</p>
316    
317        <dl class="switch">
318        <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
319          <dd>An <abbr>XBL</abbr> binding cannot be associated by
320          <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
321          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
322          style sheet.</dd>
323        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
324            <dd>XML declaration is unnecessary for HTML documents.</dd>
325        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
326        <abbr title="processing instruction">PI</abbr>)</dt>
327            <dd>Use HTML <code>link</code> element with <code>rel</code>
328            attribute set to <code>stylesheet</code> (or,
329            <code>alternate stylesheet</code> for an alternate style
330            sheet).</dd>
331        <dt><code>&lt;?php?&gt;</code> or
332        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
333        (<abbr>PHP</abbr> code)</dt>
334            <dd>The conformance checker does <em>not</em> support
335            checking for PHP source documents.</dd>
336        <dt>Other processing instructions</dt>
337            <dd>Processing instructions cannot be inserted in an HTML
338            document.  Use XML document or insert
339            <code>ProcessingInstruction</code> node by scripting.</dd>
340        </dl>
341    
342        <p>Web browsers will parse processing instructions as bogus
343        comments.  Some legacy Web browsers, such as IE:mac and
344        some mobile Web browsers, will display processing instructions
345        as string.</p>
346      </d:desc>
347    </d:item>
348    
349  </section>  </section>
350    
351  <section id="html5-parse-errors">  <section id="html5-parse-errors">
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376    </d:desc>    </d:desc>
377  </d:item>  </d:item>
378    
379    <d:item name="in a:a"
380        class="parse-error">
381      <d:message xml:lang="en">Anchor cannot be nested.</d:message>
382      <d:desc xml:lang="en">
383        <p>HTML <code>a</code> elements cannot be nested.
384        The document is non-conforming.</p>
385    
386        <p>In the HTML syntax, a start tag of the <code>a</code>
387        implies the end tag of any opening <code>a</code> element.</p>
388      </d:desc>
389    </d:item>
390    
391  <d:item name="in body"  <d:item name="in body"
392      class="parse-error">      class="parse-error">
393    <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>
394    is not allowed in <code>body</code>.</d:message>    is not allowed in the <code>body</code> element.</d:message>
395    <d:desc xml:lang="en">    <d:desc xml:lang="en">
396      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
397      cannot be a descendant of <code>body</code> element, appears      cannot be a descendant of <code>body</code> element, appears
# Line 225  Web Document Conformance Checker (BETA)< Line 400  Web Document Conformance Checker (BETA)<
400    </d:desc>    </d:desc>
401  </d:item>  </d:item>
402    
403    <d:item name="in head:head"
404        class="parse-error">
405      <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
406      is not allowed in the <code>head</code> element.</d:message>
407      <d:desc xml:lang="en">
408        <p>There is a start tag <code>&lt;head></code> in the
409        <code>&lt;head></code> element.  The document is non-conforming.</p>
410    
411        <p>In an HTML document there must not be more than
412        one <code>head</code> element, therefore no more than one
413        start tag <code>&lt;head></code> can appear in the input stream.</p>
414      </d:desc>
415    </d:item>
416    
417  <d:item name="in table"  <d:item name="in table"
418      class="parse-error">      class="parse-error">
419    <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>
420    is not allowed in <code>table</code>.</d:message>    is not allowed in a <code>table</code> element.</d:message>
421    <d:desc xml:lang="en">    <d:desc xml:lang="en">
422      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
423      cannot be a child of <code>table</code> element, appears      cannot be a child of <code>table</code> element, appears
# Line 277  Web Document Conformance Checker (BETA)< Line 466  Web Document Conformance Checker (BETA)<
466    
467  <d:item name="no DOCTYPE"  <d:item name="no DOCTYPE"
468      class="parse-error">      class="parse-error">
469    <d:message xml:lang="en">This document does not start with the    <d:message xml:lang="en">This document does not start with a
470    <code>DOCTYPE</code>.</d:message>    <code>DOCTYPE</code>.</d:message>
471    <d:desc>    <d:desc>
472      <p>The document does not start with a <code>DOCTYPE</code>.      <p>The document does not start with a <code>DOCTYPE</code>.
# Line 288  Web Document Conformance Checker (BETA)< Line 477  Web Document Conformance Checker (BETA)<
477      </p>      </p>
478    
479      <p>Only white space characters and comments are allowed      <p>Only white space characters and comments are allowed
480      before the <code>DOCTYPE</code>.</p>      before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
481        allowed in HTML document.</p>
482    </d:desc>    </d:desc>
483  </d:item>  </d:item>
484    
# Line 300  Web Document Conformance Checker (BETA)< Line 490  Web Document Conformance Checker (BETA)<
490      <p>End tag of an element is not found before, for example,      <p>End tag of an element is not found before, for example,
491      an end tag of another element appears or      an end tag of another element appears or
492      the end of the document.  The document is non-conforming.</p>      the end of the document.  The document is non-conforming.</p>
493    
494        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
495        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
496        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
497        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
498        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
499        <code>th</code>, <code>thead</code>, <code>tr</code>,
500        <code>ul</code> end tag can be omitted in HTML documents.
501        For any element except for void element, there must be an explicit
502        end tag.</p>
503    
504        <dl class="switch">
505        <dt>HTML <code>canvas</code> element</dt>
506          <dd>Though the element is void in earlier versions of Safari,
507          the <code>canvas</code> element is <em>no</em> longer
508          defined as empty.  There must be an end tag
509          <code>&lt;/canvas></code>.</dd>
510        </dl>
511    
512        <p>Note that misnesting tags, such as
513        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
514        allowed and they also cause this error.</p>
515      </d:desc>
516    </d:item>
517    
518    <d:item name="not first start tag"
519        class="parse-error">
520      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
521      the first start tag.</d:message>
522      <d:desc>
523        <p>There is a start tag of the <code>html</code> element
524        that it not the first start tag in the input stream.
525        The document is non-conforming.</p>
526    
527        <p>In an HTML document, there cannot be more than one
528        <code>html</code> element and therefore there cannot be
529        more than one <code>&lt;html></code> tag.  In addition,
530        nothing can be placed before the <code>&lt;html></code> tag
531        except a <code>DOCTYPE</code>, white space characters,
532        and comments.</p>
533    </d:desc>    </d:desc>
534  </d:item>  </d:item>
535    
# Line 309  Web Document Conformance Checker (BETA)< Line 539  Web Document Conformance Checker (BETA)<
539    HTML.</d:message>    HTML.</d:message>
540    <d:desc xml:lang="en">    <d:desc xml:lang="en">
541      <p>The document contains a <code>DOCTYPE</code> declaration      <p>The document contains a <code>DOCTYPE</code> declaration
542      that is different from HTML5 <code>DOCTYPE</code> (i.e. <code>&lt;!DOCTYPE      that is different from HTML5 <code>DOCTYPE</code> (i.e.
543      HTML&gt;</code>).  The document is non-conforming.</p>      <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>
544    
545      <p>The document might or might not be conformant to      <p>The document might or might not be conformant to
546      some version of HTML.  However, conformance to any HTML      some version of HTML.  However, conformance to any HTML
# Line 330  Web Document Conformance Checker (BETA)< Line 560  Web Document Conformance Checker (BETA)<
560    
561      <p>For any end tag in HTML document, there must be a      <p>For any end tag in HTML document, there must be a
562      corresponding start tag.</p>      corresponding start tag.</p>
563    
564        <dl class="switch">
565        <dt>HTML <code>base</code>, <code>basefont</code>,
566        <code>bgsound</code>, <code>br</code>, <code>col</code>,
567        <code>embed</code>, <code>frame</code>, <code>hr</code>,
568        <code>image</code>, <code>img</code>, <code>input</code>,
569        <code>isindex</code>, <code>link</code>, <code>meta</code>,
570        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
571          <dd>End tag is not allowed for these elements, since
572          those content must always be empty.  Remove end tag.</dd>
573        <!-- keygen -->
574        <!-- command, event-source, nest, source -->
575        </dl>
576    </d:desc>    </d:desc>
577  </d:item>  </d:item>
578    
# Line 347  Web Document Conformance Checker (BETA)< Line 590  Web Document Conformance Checker (BETA)<
590      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
591    
592      <p>Possible causes:      <p>Possible causes:
593        <dl>        <ul>
594        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
595        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
596            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
597            of certain sectioning elements such as <code>body</code>,  
598            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
599          in e.g. paragraph element such as <code>p</code>.</p></li>
600            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
601            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
602        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
603        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
604            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
605            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
606            <em>either one</em> of block-level or inline-level content        </ul>
           is allowed.  If there is a block-level content,  
           any inline-level content must be put  
           in e.g. paragraph element such as <code>p</code>.</p></dd>  
       </dl>  
607      </p>      </p>
608    </d:desc>    </d:desc>
609  </d:item>  </d:item>
# Line 378  Web Document Conformance Checker (BETA)< Line 617  Web Document Conformance Checker (BETA)<
617      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
618      The document is non-conforming.</p>      The document is non-conforming.</p>
619    
620      <p>For example:      <dl class="switch">
621        <ul>      <dt>HTML <code>head</code> element</dt>
622        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
623        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
624        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
625        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
626        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
627        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
628      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
629        </dl>
630    </d:desc>    </d:desc>
631  </d:item>  </d:item>
632    
# Line 409  Web Document Conformance Checker (BETA)< Line 649  Web Document Conformance Checker (BETA)<
649      <p>An element appears where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
650      is non-conforming.</p>      is non-conforming.</p>
651    
     <p><strong>Note</strong>: The conformance checker does  
     <em>not</em> support form elements yet.</p>  
   
652      <p>Possible causes:      <p>Possible causes:
653        <dl>        <dl class="switch">
654        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
655        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
656            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
657            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
658            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
659    
660            <p>Any inline-level content must be put            <p>Any inline-level content must be put
661            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
662        <dt>If the erred element is a block-level element (such as        <dt>If it is a block-level elements, such as <code>aside</code>,
663        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
664            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
665            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
666            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
667            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
668            any inline-level content must be put                <!-- @@ TODO: more... -->
669            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
670        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
671            <dd><p>In an XHTML document, the root <code>html</code>                    block-level or inline-level content.  If there is a
672            element must have an <code>xmlns</code> attribute                    block-level content, any inline-level content must be
673            whose value is set to                    put in e.g. paragraph element such as <code>p</code>.</p>
674            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>                    <p>For example, an HTML document fragment
675                      <code class="bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
676                      is non-conforming, since a word <q>World!</q> does not belong
677                      to any paragraph.  (If not part of any paragraph, what is
678                      it!?)  A conforming example would be:
679                        <pre class="example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
680                      </p></dd>
681                  <dt>If the parent element does <em>not</em> allow
682                  block-level elements as content</dt>
683                      <dd>The element is not allowed to be inserted here.
684                      For example, a <code>div</code> element cannot be
685                      a child of an <code>h1</code> element.</dd>
686              </dl></dd>
687          <dt>If the element with the error is a <code>noscript</code> element</dt>
688              <dd>The <code>noscript</code> element is allowed only in the context
689              where a block-level or inline-level content is expected
690              and in the <code>head</code> element.
691              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
692              or <code>select</code>.</dd>
693          <dt>If the element with the error is <code>blink</code>,
694          <code>center</code>, or <code>marquee</code> element</dt>
695              <dd>These elements are not part of the HTML standard.
696              Use CSS for styling control.</dd>
697    
698          <dt><code>button</code>, <code>datalist</code>,
699          <code>fieldset</code>, <code>form</code>,
700          <code>input</code>, <code>label</code>,
701          <code>optgroup</code>, <code>option</code>, <code>output</code>,
702          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
703          <code>textarea</code>, or <code>textarea</code> element</dt>
704          <!-- rbc, rtc ? -->
705              <dd>These elements are intentionally not supported by the conformance
706              checker <em>yet</em>.</dd>
707        </dl>        </dl>
708      </p>      </p>
709    </d:desc>    </d:desc>
710  </d:item>  </d:item>
711    
712    <d:item name="element not allowed:root"
713        class="content-model-error">
714      <d:message xml:lang="en">This element is not allowed as a root
715      element.</d:message>
716      <d:desc xml:lang="en">
717        <p>An element that is not allowed as the root element
718        is used as the root element of the document.  The document is
719        non-conforming, as far as the conformance checker can tell.</p>
720    
721        <dl class="switch">
722        <dt><code>html</code> element in an XHTML document</dt>
723            <dd><p>In an XHTML document, the root <code>html</code>
724            element must have an <code>xmlns</code> attribute
725            whose value is set to
726            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>
727        <dt><code>rss</code> element</dt>
728            <dd><p>The document is written in some version of RSS.</p>
729            <p>The conformance checker does not support any version
730            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
731        <dt><code>feed</code> element</dt>
732            <dd><p>The Atom <code>feed</code> element must be
733            in the <code>http://www.w3.org/2004/Atom</code>
734            namespace.</p>
735            <p>The conformance checker does not support Atom 0.3.
736            Use Atom 1.0 for feed documents.</p></dd>
737        </dl>
738      </d:desc>
739    </d:item>
740    
741    <d:item name="ps element missing"
742        class="content-model-error">
743      <d:message xml:lang="en">There is no <code><var>$0</var></code>
744      element before this element.</d:message>
745      <d:desc xml:lang="en">
746        <p>There must be an element before another element, but there
747        is not.  The document is non-conforming.</p>
748    
749        <p>For example, there must be a <code>dt</code> element
750        before any <code>dd</code> element.</p>
751      </d:desc>
752    </d:item>
753    
754  </section>  </section>
755    
756  <section id="attribute-errors">  <section id="attribute-errors">
# Line 454  Web Document Conformance Checker (BETA)< Line 765  Web Document Conformance Checker (BETA)<
765      is non-conforming.</p>      is non-conforming.</p>
766    
767      <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.  
768      Without required attributes specified, user agents      Without required attributes specified, user agents
769      cannot provide the full functionality of the element      cannot provide full functionality of the element to the user.</p>
770      to the user.</p>  
771        <dl class="switch">
772        <dt>HTML <code>img</code> element</dt>
773            <dd>The <code>src</code> attribute must be specified.
774            Additionally, the <code>alt</code> attribute must be specified
775            in many cases.</dd>
776        <dt>HTML <code>link</code> element</dt>
777            <dd>The <code>rel</code> attribute must be specified.
778            Note that the <code>rev</code> attribute is obsolete.</dd>
779        </dl>
780      </d:desc>
781    </d:item>
782    
783    <d:item name="attribute not allowed" class="attribute-error">
784      <d:message xml:lang="en">Attribute
785      <code><var>{local-name}</var></code> is not allowed for
786      <code><var>{element-local-name}</var></code> element.</d:message>
787      <d:desc xml:lang="en">
788        <p>An attribute is specified where it is not allowed.
789        The document is non-conforming.</p>
790    
791        <dl>
792        <dt>HTML <code>meta</code> element</dt>
793            <dd>For HTML <code>meta</code> element, <em>only one</em> of
794            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
795            attribute is allowed.</dd>
796        </dl>
797    </d:desc>    </d:desc>
798  </d:item>  </d:item>
799    
# Line 466  Web Document Conformance Checker (BETA)< Line 801  Web Document Conformance Checker (BETA)<
801      class="attribute-error">      class="attribute-error">
802    <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
803    allowed in HTML document.</d:message>    allowed in HTML document.</d:message>
804    <d:desc>    <d:desc xml:lang="en">
805      <p>The <code>xml:lang</code> attribute is not allowed in      <p>The <code>xml:lang</code> attribute is not allowed in
806      HTML document.  The document is non-conforming.</p>      HTML document.  The document is non-conforming.</p>
807    
808      <p>The <code>lang</code> attribute in the <code>null</code>      <p>Use of the <code>xml:lang</code> attribute is conforming
809      namespace for HTML elements is defined as conforming <em>only</em> for      <em>only</em> in XML documents.</p>
     XML document.</p>  
810    
811      <p>To specify natural language information in HTML document,      <p>To specify natural language information in HTML document,
812      use <code>lang</code> attribute instead.</p>      use <code>lang</code> attribute instead.</p>
813    
814        <p>XHTML 1.0 Appendix C was encouraged to specify both
815        <code>lang</code> and <code>xml:lang</code> attributes with
816        the same value.  Such a duplication has <em>no effect</em> in practice.
817        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
818        XML).</p>
819    
820      <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created      <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
821           from an HTML document? -->           from an HTML document? -->
822    </d:desc>    </d:desc>
# Line 506  Web Document Conformance Checker (BETA)< Line 847  Web Document Conformance Checker (BETA)<
847      XML document.  The document is non-conforming.</p>      XML document.  The document is non-conforming.</p>
848    
849      <p>The <code>lang</code> attribute in <code>null</code>      <p>The <code>lang</code> attribute in <code>null</code>
850      namespace for HTML elements is defined as conforming <em>only</em> for      namespace for HTML elements is conforming <em>only</em> in
851      HTML document.</p>      HTML documents.</p>
852    
853      <p>To specify natural language information in XML document,      <p>To specify natural language information in XML document,
854      use <code>xml:lang</code> attribute instead.</p>      use <code>xml:lang</code> attribute instead.</p>
# Line 523  Web Document Conformance Checker (BETA)< Line 864  Web Document Conformance Checker (BETA)<
864      <p>The <code>xmlns</code> attribute in the <code>null</code>      <p>The <code>xmlns</code> attribute in the <code>null</code>
865      namespace is not allowed in XHTML document.</p>      namespace is not allowed in XHTML document.</p>
866    
867      <p>This error should not occur in conformance-checking      <p>This error should not occur in conformance-checking of
868      static documents.</p>      static documents.</p>
869    </d:desc>    </d:desc>
870  </d:item>  </d:item>
# Line 536  Web Document Conformance Checker (BETA)< Line 877  Web Document Conformance Checker (BETA)<
877  <d:item name="enumerated:invalid"  <d:item name="enumerated:invalid"
878      class="attribute-value-error">      class="attribute-value-error">
879    <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
880    values and the specified value is not one of them.</d:message>    values and the specified value <code><var>{@}</var></code> is not one
881      of them.</d:message>
882      <d:desc xml:lang="en">
883        <p>For this attribute only several values are allowed and the
884        value of the attribute is not one of them.  The document
885        is non-conforming.</p>
886    
887        <dl>
888        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
889            <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>
890            is allowed.</p>
891            <p>Value <code>Content-Type</code> is obsolete; for charset
892            declaration, the <code>charset</code> attribute can be used as:
893            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
894            ... where <var>charset-name</var> is a name of the character encoding
895            of the document, such as <code>utf-8</code>.</p>
896            <p>Values <code>Content-Style-Type</code> and
897            <code>Content-Script-Type</code> are currently not allowed.</p>
898            <p>Value <code>Keywords</code> is not allowed.  Use
899            <code>name</code> attribute instead of <code>http-equiv</code>
900            attribute.</p>
901            <p>Values <code>Expires</code>, <code>Pragma</code>,
902            and <code>Cache-Control</code> are not allowed;
903            use <em>real</em> HTTP header fields for cache control.</p></dd>
904        </dl>
905      </d:desc>
906  </d:item>  </d:item>
907    
908  <d:item name="duplicate ID"  <d:item name="duplicate ID"
# Line 546  Web Document Conformance Checker (BETA)< Line 912  Web Document Conformance Checker (BETA)<
912    <!-- @@ <id=a xml:id=a>? -->    <!-- @@ <id=a xml:id=a>? -->
913  </d:item>  </d:item>
914    
915  <d:item name="link type:bad-context"  <d:item name="link type:bad context"
916      class="attribute-value-error">      class="attribute-value-error">
917    <d:message xml:lang="en">The link type <code><var>$0</var></code>    <d:message xml:lang="en">The link type <code><var>$0</var></code>
918    cannot be specified for this element.</d:message>    cannot be specified for this element.</d:message>
# Line 568  Web Document Conformance Checker (BETA)< Line 934  Web Document Conformance Checker (BETA)<
934    <d:message xml:lang="en">The link type <code><var>$0</var></code>    <d:message xml:lang="en">The link type <code><var>$0</var></code>
935    is non-conforming.</d:message>    is non-conforming.</d:message>
936    <d:desc xml:lang="en">    <d:desc xml:lang="en">
937      <p>The specified link type is non-conforming.  The entire document      <p>The specified link type is non-conforming, and therefore
938      is non-conforming.</p>      the document is non-conforming.</p>
939    
940      <p>For example, in place of non-conforming link type <code>copyright</code>      <dl class="switch">
941      you must use link type <code>license</code>.</p>      <dt>Link type <code>contents</code></dt>
942          <dd>Use link type <code>index</code>.</dd>
943        <dt>Link type <code>copyright</code></dt>
944          <dd>Use link type <code>license</code>.</dd>
945        <dt>Link type <code>home</code></dt>
946          <dd>Use link type <code>index</code>.</dd>
947        <dt>Link type <code>previous</code></dt>
948          <dd>Use link type <code>prev</code>.</dd>
949        <dt>Link type <code>start</code></dt>
950          <dd>Use link type <code>first</code>.</dd>
951        <dt>Link type <code>toc</code> or <code>top</code></dt>
952          <dd>Use link type <code>index</code>.</dd>
953        </dl>
954    </d:desc>    </d:desc>
955  </d:item>  </d:item>
956    
957  <d:item name="reserved browsing context name"  <d:item name="reserved browsing context name"
958      class="attribute-value-error">      class="attribute-value-error">
959    <d:message xml:lang="en">This browsing context name is reserved.</d:message>    <d:message xml:lang="en">Browsing context name
960    <d:item>    <code><var>{@}</var></code> is reserved.</d:message>
961      <d:desc xml:lang="en">
962      <p>The specified browsing context name is reserved.      <p>The specified browsing context name is reserved.
963      The document is non-conforming.</p>      The document is non-conforming.</p>
964    
# Line 592  Web Document Conformance Checker (BETA)< Line 971  Web Document Conformance Checker (BETA)<
971      browsing context names <code>_blank</code>,      browsing context names <code>_blank</code>,
972      <code>_main</code>, and <code>_replace</code>.      <code>_main</code>, and <code>_replace</code>.
973      However, they are <em>not</em> conforming attribute values.</p>      However, they are <em>not</em> conforming attribute values.</p>
974    </d:item>    </d:desc>
975  </d:item>  </d:item>
976    
977  </section>  </section>
# Line 612  Web Document Conformance Checker (BETA)< Line 991  Web Document Conformance Checker (BETA)<
991    
992      <p><strong>Warning</strong>: The data served to the      <p><strong>Warning</strong>: The data served to the
993      conforming checker might be out of date; it might have already      conforming checker might be out of date; it might have already
994      been accepted or rejected, depending on which the document      been accepted or rejected.  The document might or might not be
995      might be conforming or non-conforming.  See WHATWG Wiki      conforming depending on the status.  See WHATWG Wiki
996      for the latest information.</p>      for the latest information.</p>
997    </d:desc>    </d:desc>
998  </d:item>  </d:item>
# Line 636  Web Document Conformance Checker (BETA)< Line 1015  Web Document Conformance Checker (BETA)<
1015    <code>th</code>) in the last row.</d:message>    <code>th</code>) in the last row.</d:message>
1016  </d:item>  </d:item>
1017    
1018    <d:item name="table:rowspan extends table"
1019        class="table-model-error">
1020      <d:message xml:lang="en">This <code>rowspan</code> attribute
1021      results in creating a table row that does not contain
1022      any cell anchored to it.</d:message>
1023      <d:desc xml:lang="en">
1024        <p>The <code>rowspan</code> attribute value of the cell
1025        is so specified that it extends a table in the row axis.
1026        However, the extended row does not contain any cell by itself.
1027        The document is non-conforming.</p>
1028    
1029        <p>For example, the table below is non-conforming:
1030          <pre class="html non-conforming example"><code>&lt;table>
1031    &lt;tbody>
1032    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
1033    &lt;/tbody>
1034    &lt;/table></code></pre>
1035        ... since the second row contains only
1036        a cell that spans between first and second rows.</p>
1037      </d:desc>
1038    </d:item>
1039    
1040  </section>  </section>
1041    
1042  <section id="imt-warnings">  <section id="imt-warnings">
# Line 643  Web Document Conformance Checker (BETA)< Line 1044  Web Document Conformance Checker (BETA)<
1044    
1045  <d:item name="IMT:obsolete subtype"  <d:item name="IMT:obsolete subtype"
1046      class="should" level="s">      class="should" level="s">
1047    <d:message xml:lang="en">An <em>obsolete</em> subtype is used.</d:message>    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
1048      subtype is used.</d:message>
1049      <d:item xml:lang="en">
1050        <p>The specified Internet Media Type is registered with status
1051        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
1052        
1053        <dl class="swtich">
1054        <dt>Media type <code>text/ecmascript</code></dt>
1055          <dd>Media type <code>text/ecmascript</code> is obsoleted in
1056          favor of <code>application/ecmascript</code>.  Note that
1057          <code>text/javascript</code> would be better alternative
1058          for many cases.</dd>
1059        <dt>Media type <code>text/javascript</code></dt>
1060          <dd>Media type <code>text/javascript</code> is obsoleted by
1061          <abbr>IETF</abbr> with backward incompatible alternate
1062          <code>application/javascript</code> for architectural
1063          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
1064        </dl>
1065      </d:item>
1066  </d:item>  </d:item>
1067    
1068  <d:item name="IMT:private subtype"  <d:item name="IMT:private subtype"
1069      class="should" level="s">      class="should" level="s">
1070    <d:message xml:lang="en">A private (<code>x-</code> or <code>x.</code>)    <d:message xml:lang="en"><code><var>{@}</var></code>: A private
1071    subtype is used.</d:message>    (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
1072  </d:item>  </d:item>
1073    
1074  <d:item name="IMT:unregistered subtype"  <d:item name="IMT:unregistered subtype"
1075      class="should" level="s">      class="should" level="s">
1076    <d:message xml:lang="en">The subtype is not registered to IANA.</d:message>    <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
1077      not registered to IANA.</d:message>
1078  <!-- TODO: Unknown message?? -->  <!-- TODO: Unknown message?? -->
1079  </d:item>  </d:item>
1080    
# Line 665  Web Document Conformance Checker (BETA)< Line 1085  Web Document Conformance Checker (BETA)<
1085    
1086  <d:item name="URI::syntax error"  <d:item name="URI::syntax error"
1087      class="must" level="m">      class="must" level="m">
1088    <d:message xml:lang="en">This string is not an IRI syntactically.</d:message>    <d:message xml:lang="en">The specified value is syntactically not an IRI
1089      reference.</d:message>
1090      <d:desc xml:lang="en">
1091        <p>The specified value does not satisfy the syntactical requirements
1092        for IRI references.  The document is non-conforming.</p>
1093    
1094        <p>Possible causes:
1095          <ul>
1096          <li>The string might contain one or more white space characters.
1097          Especially, the <code> </code> (<code>U+0020</code>
1098          <code class="charname">SPACE</code>) character cannot be
1099          used in IRI references.</li>
1100          </ul>
1101        </p>
1102      </d:desc>
1103  </d:item>  </d:item>
1104    
1105  </section>  </section>
1106    
1107  <section id="uri-warnings">  <section id="uri-shoulds">
1108  <h2>URI (or IRI) Warnings</h2>  <h2>URI (or IRI) Should-level Errors</h2>
1109    
1110  <d:item name="URI::dot-segment"  <d:item name="URI::dot-segment"
1111      class="should" level="s">      class="should" level="s">
1112    <d:message xml:lang="en">Dot-segment (<code>.</code> or    <d:message xml:lang="en">A dot-segment (<code>.</code> or
1113    <code>..</code>) should not occur in an absolute reference.</d:message>    <code>..</code>) occurs in an absolute reference.</d:message>
1114    <d:desc>    <d:desc>
1115      <p>Dot-segment (<code>.</code> or <code>..</code>) should      <p>Dot-segment (<code>.</code> or <code>..</code>) should
1116      not occur in an absolute reference.</p>      not occur in an absolute reference.</p>
# Line 691  Web Document Conformance Checker (BETA)< Line 1125  Web Document Conformance Checker (BETA)<
1125    
1126  <d:item name="URI::empty path"  <d:item name="URI::empty path"
1127      class="should" level="s">      class="should" level="s">
1128    <d:message xml:lang="en">This IRI should explicitly end with    <d:message xml:lang="en">This IRI does not end with
1129    <code>/</code>.</d:message>    a <code>/</code>.</d:message>
1130      <d:item xml:lang="en">
1131        <p>The IRI does not end with a <code>/</code>.  If there is an
1132        authority component in an IRI, a <code>/</code> should be present
1133        instead of empty path component.</p>
1134    
1135        <p>For example, <code>http://www.example.com<strong>/</strong></code>
1136        is preferred to <code>http://www.example.com</code>.</p>
1137      </d:item>
1138  </d:item>  </d:item>
1139    
1140  <d:item name="URI::lowercase hexadecimal digit"  <d:item name="URI::lowercase hexadecimal digit"
1141      class="should" level="s">      class="should" level="s">
1142    <d:message xml:lang="en">Hexadecimal digit in percent-encoding    <d:message xml:lang="en">A lowercase hexadecimal digit is used
1143    should be in lowercase.</d:message>    in percent-encoding.</d:message>
1144    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1145      <p>The hexadecimal digit in percent-encoding string in the IRI      <p>The hexadecimal digit in percent-encoding string in the IRI
1146      is in lowercase.  Though the IRI <em>is</em> conforming,      is in lowercase.  Though the IRI <em>is</em> conforming,
# Line 717  Web Document Conformance Checker (BETA)< Line 1159  Web Document Conformance Checker (BETA)<
1159    </d:desc>    </d:desc>
1160  </d:item>  </d:item>
1161    
1162    <d:item name="URI::uppercase scheme name"
1163        class="should" level="s">
1164      <d:message xml:lang="en">URI scheme name is in uppercase.</d:message>
1165      <d:desc xml:lang="en">
1166        <p>The scheme part of the IRI is written in uppercase letter.</p>
1167    
1168        <p>Uppercase scheme names are not required to be processed
1169        correctly.</p>
1170    <!-- @@
1171     RFC 3986 3.1.
1172     > Although schemes are case-
1173       insensitive, the canonical form is lowercase and documents that
1174       specify schemes must do so with lowercase letters.
1175    
1176     > An implementation ... should only produce lowercase scheme names for
1177       consistency.
1178    -->
1179      </d:desc>
1180    </d:item>
1181    
1182    </section>
1183    
1184    <section id="cache-manifest-errors">
1185    <h2>Cache Manifest Errors</h2>
1186    
1187    <d:item name="not manifest" class="must" level="m">
1188      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
1189      <d:desc xml:lang="en">
1190        <p>The specified document is <em>not</em> a cache manifest.
1191        The document is non-conforming.</p>
1192    
1193        <p>An entity labeled as Internet media type
1194        <code>text/cache-manifest</code> must contain a cache manifest.</p>
1195    
1196        <p>A cache manifest must start with a line whose content is
1197        <code>CACHE MANIFEST</code> (exactly one space character between
1198        <code>CACHE</code> and <code>MANIFEST</code>).</p>
1199      </d:desc>
1200    </d:item>
1201  </section>  </section>
1202    
1203  <section id="unsupported-messages">  <section id="unsupported-messages">
1204  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1205    
1206  <d:item name="attribute"  <d:item name="element"
1207      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1208    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1209    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
1210      might not be conforming</em>.</d:message>
1211    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1212      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1213      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1214    </d:desc>    </d:desc>
1215  </d:item>  </d:item>
1216    
1217  <d:item name="element"  <d:item name="attribute"
1218      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1219    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1220    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1221      <code><var>{element-local-name}</var></code> is not supported;
1222      <em>it might or might not be conforming</em>.</d:message>
1223    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1224      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
1225      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1226    </d:desc>    </d:desc>
1227  </d:item>  </d:item>
1228    
1229  <d:item name="link type"  <d:item name="link type"
1230      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1231    <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
1232    standardized or registered at the time of the release of the conformance    standardized or registered at the time of the release of the conformance
1233    checker; <em>it is non-conforming unless it has now been    checker; <em>it is non-conforming unless it now has been
1234    registered</em>.</d:message>    registered</em>.</d:message>
1235    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1236      <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 759  Web Document Conformance Checker (BETA)< Line 1243  Web Document Conformance Checker (BETA)<
1243      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1244      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1245      document is non-conforming.</p>      document is non-conforming.</p>
1246    
1247        <dl>
1248        <dt>Link types <code>shortcut icon</code></dt>
1249            <dd>Link type <code>shortcut</code> is not registered.
1250            Use only <code>icon</code> for linking to so-called favicon.</dd>
1251        </dl>
1252    </d:desc>    </d:desc>
1253  </d:item>  </d:item>
1254    
# Line 768  Web Document Conformance Checker (BETA)< Line 1258  Web Document Conformance Checker (BETA)<
1258    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>
1259  </d:item>  </d:item>
1260    
 <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>  
   
1261  <d:item name="media query"  <d:item name="media query"
1262      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1263    <d:message xml:lang="en">Conformance checking for media query    <d:message xml:lang="en">Conformance checking for media query
# Line 805  manakaiIsHTML:1;;HTML Document Line 1289  manakaiIsHTML:1;;HTML Document
1289  manakaiIsHTML:0;;XML Document  manakaiIsHTML:0;;XML Document
1290  </d:catalog>  </d:catalog>
1291    
1292    <section id="levels">
1293    <h2>Error Levels</h2>
1294    
1295    <table id="levels-table">
1296    <thead>
1297    <tr><th scope="col">Level</th>
1298    <th scope="col">Conforming?</th>
1299    <th scope="col">Description</th>
1300    </tr>
1301    </thead>
1302    <tbody>
1303    <tr id="level-m" class="level-m">
1304    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
1305    <td>Non‐conforming.</td>
1306    <td>A violation to a hard requirement of the specification.
1307    The document is non‐conforming.</td>
1308    </tr>
1309    <tr id="level-s" class="level-s">
1310    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
1311    <td>Non‐conforming, but <em>in some case</em>
1312    conforming.</td>
1313    <td>A violation to a requirement of the specification.
1314    The violation might be legitimize in some case.  Otherwise,
1315    the document is non‐conforming.</td>
1316    </tr>
1317    <tr id="level-w" class="level-w">
1318    <th scope="row">Warning</th>
1319    <td>Conforming.</td>
1320    <td>A warning is an advice from the conformance checker to avoid
1321    to solve a problem in a confusing or possibly wrong way.
1322    It does not affect to the conformance of the document, and
1323    may sometimes be inappropriate.</td>
1324    </tr>
1325    <tr id="level-unsupported" class="level-unsupported">
1326    <th scope="row">Not supported</th>
1327    <td><em>Unknown</em>.</td>
1328    <td>Some feature that is not supported by the conformance checker
1329    is used in the document.</td>
1330    </tr>
1331    </tbody>
1332    </table>
1333    </section>
1334    
1335  <section id="license">  <section id="license">
1336  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1337    
1338  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>
1339  <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>
1340    <code class="mail">&lt;<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>></code>.</p>
1341    
1342    <p>This document is free software; you can redistribute it
1343  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1344  </section>  </section>
1345    
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