/[suikacvs]/test/html-webhacc/error-description-source.xml
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revision 1.7 by wakaba, Sat Aug 11 13:54:55 2007 UTC revision 1.13 by wakaba, Mon Nov 5 09:33:52 2007 UTC
# Line 53  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 172  Web Document Conformance Checker (BETA)< Line 175  Web Document Conformance Checker (BETA)<
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"  <d:item name="bogus end tag"
211      class="tokenize-error">      class="tokenize-error">
212    <d:message xml:lang="en">A <code>&lt;/</code> string is not followed    <d:message xml:lang="en">String <code>&lt;/</code> is not followed
213    by a tag name.</d:message><!-- </ non-name-start-char-non-EOF -->    by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
214    <d:desc xml:lang="en">    <d:desc xml:lang="en">
215      <p>There is a <code>&lt;</code> (<code>U+003C</code>      <p>There is a <code>&lt;</code> (<code>U+003C</code>
216      <code class="charname">LESS-THAN SIGN</code>) character      <code class="charname">LESS-THAN SIGN</code>) character
# Line 226  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>
# Line 247  Web Document Conformance Checker (BETA)< Line 306  Web Document Conformance Checker (BETA)<
306  <d:item name="pio"  <d:item name="pio"
307      class="tokenize-error">      class="tokenize-error">
308    <d:message xml:lang="en">Processing instruction    <d:message xml:lang="en">Processing instruction
309    (<code>&lt;?<var>...</var>?></code>) cannot be used.</d:message>    (<code>&lt;?<var>...</var>></code>) cannot be used.</d:message>
310    <d:desc xml:lang="en">    <d:desc xml:lang="en">
311      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
312      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
313      and XML style sheet <abbr title="processing instruction">PI</abbr>      and XML style sheet <abbr title="processing instruction">PI</abbr>
314      (<code>&lt;xml-stylesheet <var>...</var>?></code>), are not allowed      (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
315      in the HTML syntax.  The document is non-conforming.</p>      in the HTML syntax.  The document is non-conforming.</p>
316    
317      <p>If it is necessary to embed a processing instruction      <dl class="switch">
318      in the HTML document, you must use the XML syntax instead.</p>      <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
319          <dd>An <abbr>XBL</abbr> binding cannot be associated by
320      <p>In the HTML syntax, XML declaration is not necessary.</p>        <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
321          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
322      <p>Instead of XML style sheet,        style sheet.</dd>
323      <abbr title="processing instruction">PI</abbr>s, you must      <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
324      use the HTML <code>link</code> element whose <code>rel</code>          <dd>XML declaration is unnecessary for HTML documents.</dd>
325      attribute is set to <code>stylesheet</code> (or      <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
326      <code>alternate stylesheet</code> for an aleternate style sheet).</p>      <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      <p>Web browsers will parse processing instructions as bogus
343      comments.  Some legacy Web browsers, such as IE:mac and      comments.  Some legacy Web browsers, such as IE:mac and
344      some mobile browsers, will display processing instructions      some mobile Web browsers, will display processing instructions
345      as string.</p>      as string.</p>
346    </d:desc>    </d:desc>
347  </d:item>  </d:item>
# Line 318  Web Document Conformance Checker (BETA)< Line 391  Web Document Conformance Checker (BETA)<
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 a <code>body</code> element.</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 329  Web Document Conformance Checker (BETA)< Line 402  Web Document Conformance Checker (BETA)<
402    
403  <d:item name="in head:head"  <d:item name="in head:head"
404      class="parse-error">      class="parse-error">
405    <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>
406    is not allowed in the <code>head</code> element.</d:message>    is not allowed in the <code>head</code> element.</d:message>
407    <d:desc xml:lang="en">    <d:desc xml:lang="en">
408      <p>There is a start tag <code>&lt;head></code> in the      <p>There is a start tag <code>&lt;head></code> in the
# Line 404  Web Document Conformance Checker (BETA)< Line 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 416  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>    </d:desc>
516  </d:item>  </d:item>
517    
# Line 464  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 508  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 539  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 class="switch">        <dl class="switch">
654        <dt>If the element with the error is an inline-level element,        <dt>If the element with the error is an inline-level element,
# Line 552  Web Document Conformance Checker (BETA)< Line 659  Web Document Conformance Checker (BETA)<
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 element with the error is a block-level element,        <dt>If it is a block-level elements, such as <code>aside</code>,
663        such as <code>div</code>, <code>h<var>n</var></code>, or        <code>div</code>, <code>h<var>n</var></code>,
664        <code>section</code></dt>        <code>p</code>, or <code>section</code></dt>
665            <dd><p>Though some elements such as <code>div</code>,            <dd><dl class="switch">
666            <code>li</code>, and <code>td</code> allow                <dt>If the parent element is <code>div</code>,
667            <em>either one</em> of block-level or inline-level content                <code>li</code>, <code>td</code>, or <code>th</code></dt>
668            is allowed.  If there is a block-level content,                <!-- @@ TODO: more... -->
669            any inline-level content must be put                    <!-- @@ TODO: <p><ul><li><p> -->
670            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <dd><p>The parent element allows <em>either</em>
671                      block-level or inline-level content.  If there is a
672                      block-level content, any inline-level content must be
673                      put in e.g. paragraph element such as <code>p</code>.</p>
674                      <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>        <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            <dd>The <code>noscript</code> element is allowed only in the context
689            where a block-level or inline-level content is expected            where a block-level or inline-level content is expected
690            and in the <code>head</code> element.            and in the <code>head</code> element.
691            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>,
692            or <code>select</code>.</dd>            or <code>select</code>.</dd>
693        <dt>If the element with the error is the <code>html</code> element        <dt>If the element with the error is <code>blink</code>,
694        that is the root element of an XHTML document</dt>        <code>center</code>, or <code>marquee</code> element</dt>
695            <dd><p>In an XHTML document, the root <code>html</code>            <dd>These elements are not part of the HTML standard.
696            element must have an <code>xmlns</code> attribute            Use CSS for styling control.</dd>
697            whose value is set to  
698            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>        <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"  <d:item name="ps element missing"
742      class="content-model-error">      class="content-model-error">
743    <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 605  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 617  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>
# Line 664  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 681  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 696  Web Document Conformance Checker (BETA)< Line 879  Web Document Conformance Checker (BETA)<
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 <code><var>{@}</var></code> is not one    values and the specified value <code><var>{@}</var></code> is not one
881    of them.</d:message>    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 730  Web Document Conformance Checker (BETA)< Line 937  Web Document Conformance Checker (BETA)<
937      <p>The specified link type is non-conforming, and therefore      <p>The specified link type is non-conforming, and therefore
938      the document is non-conforming.</p>      the document is non-conforming.</p>
939    
940      <dl>      <dl class="switch">
941      <dt>Link type <code>contents</code></dt>      <dt>Link type <code>contents</code></dt>
942        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
943      <dt>Link type <code>copyright</code></dt>      <dt>Link type <code>copyright</code></dt>
944        <dd>Use link type <code>license</code>.</dd>        <dd>Use link type <code>license</code>.</dd>
945      <dt>Link type <code>home</code></dt>      <dt>Link type <code>home</code></dt>
946        <dd>Use link type <code>index</code>.</dd>        <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>      <dt>Link type <code>start</code></dt>
950        <dd>Use link type <code>first</code>.</dd>        <dd>Use link type <code>first</code>.</dd>
951      <dt>Link type <code>toc</code></dt>      <dt>Link type <code>toc</code> or <code>top</code></dt>
952        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
953      </dl>      </dl>
954    </d:desc>    </d:desc>
# Line 782  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 823  Web Document Conformance Checker (BETA)< Line 1032  Web Document Conformance Checker (BETA)<
1032  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
1033  &lt;/tbody>  &lt;/tbody>
1034  &lt;/table></code></pre>  &lt;/table></code></pre>
1035      ... is non-conforming, since the second row contains only      ... since the second row contains only
1036      a cell that spans the first and the second rows.</p>      a cell that spans between first and second rows.</p>
1037    </d:desc>    </d:desc>
1038  </d:item>  </d:item>
1039    
# Line 837  Web Document Conformance Checker (BETA)< Line 1046  Web Document Conformance Checker (BETA)<
1046      class="should" level="s">      class="should" level="s">
1047    <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>
1048    subtype is used.</d:message>    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"
# Line 878  Web Document Conformance Checker (BETA)< Line 1104  Web Document Conformance Checker (BETA)<
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 899  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 947  Web Document Conformance Checker (BETA)< Line 1181  Web Document Conformance Checker (BETA)<
1181    
1182  </section>  </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>
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 987  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 996  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 1033  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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