/[pub]/test/html-webhacc/error-description-source.xml
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revision 1.1 by wakaba, Sun Jul 1 10:02:24 2007 UTC revision 1.4 by wakaba, Mon Jul 16 13:56:26 2007 UTC
# Line 11  Web Document Conformance Checker (BETA)< Line 11  Web Document Conformance Checker (BETA)<
11  <body>  <body>
12  <h1>Description of Errors</h1>  <h1>Description of Errors</h1>
13    
14  <section id="html5-parse-errors">  <section id="html5-tokenize-error">
15  <h2>HTML5 Parse Errors</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
16    
17  <d:item name="after head"  <d:item name="after html"
18      class="parse-error">      class="parse-error">
19    <d:message xml:lang="en">The <code><var>$0</var></code> element cannot be    <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
20    inserted between <code>head</code> and <code>body</code> elements.</d:message>    is not allowed after the end tag <code>&lt;/html></code>.</d:message>
21    <d:desc xml:lang="en">    <d:desc xml:lang="en">
22      <p>A start tag occurs after the <code>head</code> element is closed      <p>The start or end tag of an element appears after the
23      but before the <code>body</code> element is opened.      <code>html</code> element has been closed.  The document is
24        non-conforming.</p>
25    
26        <p>Any content of the document other than comments
27        must be put into the <code>html</code> element.</p>
28      </d:desc>
29    </d:item>
30    
31    <d:item name="bare ero"
32        class="tokenize-error">
33      <d:message xml:lang="en">The <code>&amp;</code> character must
34      introduce a reference.</d:message>
35      <d:desc xml:lang="en">
36        <p>An <code>&amp;</code> (<code>U+0026</code>
37        <code class="charname">AMPERSAND</code>) character which
38        is not part of any reference appears in the input stream.
39        The document is non-conforming.</p>
40    
41        <p>The <code>&amp;</code> character must
42        be the first character of a reference:
43          <dl>
44          <dt>Named entity reference</dt>
45              <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
46              where <var>entity-name</var> is the name of the
47              character entity to be referenced.</dd>
48          <dt>Numeric character reference</dt>
49              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
50              where <var>d</var> is the decimal representation of
51              the code position of the character to be referenced.</dd>
52          <dt>Hexadecimal character reference</dt>
53              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
54              where <var>h</var> is the hexadecimal representation
55              of the code position of the character to be referenced.</dd>
56          </dl>
57        </p>
58    
59        <p>To represent <code>&amp;</code> as a data character, use
60        named entity reference:
61          <pre class="html example"><code>&amp;amp;</code></pre>
62        </p>
63      </d:desc>
64    </d:item>
65    
66    <d:item name="bare stago"
67        class="tokenize-error">
68      <d:message xml:lang="en">A <code>&lt;</code> character is not followed
69      by tag name or by a <code>!</code> character.</d:message>
70      <d:desc xml:lang="en">
71        <p>A <code>&lt;</code> (<code>U+003C</code> <code class="charname">LESS-THAN
72        SIGN</code>) character which is not part of any markup appears
73        in the input stream.</p>
74    
75        <p>The <code>&lt;</code> character as a data character must
76        be escaped as:
77        <pre class="html example"><code>&lt;lt;</code></pre>
78        </p>
79      </d:desc>
80    </d:item>
81    
82    <d:item name="bare nero"
83        class="tokenize-error">
84      <d:message xml:lang="en">The decimal representation of the code position
85      of a character must be specified after <code>&amp;#</code>.</d:message>
86      <d:desc xml:lang="en">
87        <p>An <code>&amp;</code> (<code>U+0026</code>
88        <code class="charname">AMPERSAND</code>) character immediately
89        followed by a <code>#</code> (<code>U+0023</code>
90        <code>NUMBER SIGN</code>) character which
91        is not part of any reference appears in the input stream.
92      The document is non-conforming.</p>      The document is non-conforming.</p>
93    
94        <p>The string <code>&amp;#</code> must be the first two characters
95        <code>NUMBER SIGN</code>) character must be the first two characters
96        of a reference:
97          <dl>
98          <dt>Numeric character reference</dt>
99              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
100              where <var>d</var> is the decimal representation of
101              the code point of the character to be referenced.</dd>
102          <dt>Hexadecimal character reference</dt>
103              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
104              where <var>h</var> is the hexadecimal representation
105              of the code point of the character to be referenced.</dd>
106          </dl>
107        </p>
108    
109        <p>To represent <code>&amp;#</code> as data characters, use
110        named entity reference:
111          <pre class="html example"><code>&amp;amp;#</code></pre>
112        </p>
113      </d:desc>
114    </d:item>
115    
116    <d:item name="bare hcro"
117        class="tokenize-error">
118      <d:message xml:lang="en">The hexadecimal representation of the code position
119      of a character must be specified after <code>&amp;#x</code>.</d:message>
120      <d:desc xml:lang="en">
121       <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> which
122       is not part of any reference appears in the input stream.
123        The document is non-conforming.</p>
124    
125        <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> must
126        be the first three characters of a hexadecimal reference:
127          <pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
128        where <var>h</var> is the hexadecimal representation
129        of the code point of the character to be referenced.</p>
130    
131        <p>To represent <code>&amp;#x</code> as data characters, use
132        named entity reference:
133          <pre class="html example"><code>&amp;amp;#x</code></pre>
134        </p>
135      </d:desc>
136    </d:item>
137    
138    <d:item name="dash in comment"
139        class="tokenize-error">
140      <d:message xml:lang="en">There is a <code>--</code> sequence
141      in a comment.</d:message>
142      <d:desc xml:lang="en">
143        <p>There is a <code>-</code> (<code>U+002D</code>
144        <code class="charname">HYPHEN-MINUS</code>) character
145        at the end of the comment or a <code>--</code> sequence
146        in the comment.  The document is non-conforming.</p>
147    
148        <p>Comments cannot contain a string <code>--</code>, as in XML.
149        Unlike SGML, there cannot be more than one comments
150        (where <i>comment</i> is an SGML term) in the comment
151        declaration.</p>
152    </d:desc>    </d:desc>
153  </d:item>  </d:item>
154    
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156      class="tokenize-error">      class="tokenize-error">
157    <d:message xml:lang="en">There are two attributes with same name.</d:message>    <d:message xml:lang="en">There are two attributes with same name.</d:message>
158    <d:desc xml:lang="en">    <d:desc xml:lang="en">
159      <p>Attributes must be unique in an element.  Specifying      <p>There are more than one attributes with the same
160      attributes with same name more than once is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
161    
162      <p>The <code>motion</code> attribute is not part of the HTML standard.      <p>The <code>motion</code> attribute is not part of the HTML standard.
163      Use <code>img</code> element with animation GIF instead.</p>      Use <code>img</code> element with animation GIF instead.</p>
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169    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be
170    used for this element.</d:message>    used for this element.</d:message>
171    <d:desc xml:lang="en">    <d:desc xml:lang="en">
172      <p>The void element syntax <code>/></code> syntax can only be      <p>Void element syntax (<code>/></code>) must not be used
173        for the element.  The document is non-conforming.</p>
174    
175        <p>The void element syntax can only be
176      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
177      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
178      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
179      <code>col</code>, and <code>input</code> elements.      <code>col</code>, and <code>input</code> elements.</p>
     For any other elements, using that syntax is non-conforming.</p>  
180    
181      <p>Unlike XML, the void element syntax (<code>/></code>) has      <p>Note that, unlike in XML, the void element syntax has
182      no effect in HTML.</p>      no effect in HTML.</p>
183    </d:desc>    </d:desc>
184  </d:item>  </d:item>
185    
186  </section>  </section>
187    
188    <section id="html5-parse-errors">
189    <h2>HTML5 Parse Errors in Tree Construction Stage</h2>
190    
191    <d:item name="after head"
192        class="parse-error">
193      <d:message xml:lang="en">The <code><var>$0</var></code> element cannot be
194      inserted between <code>head</code> and <code>body</code> elements.</d:message>
195      <d:desc xml:lang="en">
196        <p>A start tag appears after the <code>head</code> element is closed
197        but before the <code>body</code> element is opened.
198        The document is non-conforming.</p>
199      </d:desc>
200    </d:item>
201    
202    <d:item name="DOCTYPE in the middle"
203        class="parse-error">
204      <d:message xml:lang="en">A <code>DOCTYPE</code> appears after any
205      element or data character has been seen.</d:message>
206      <d:desc xml:lang="en">
207        <p>A <code>DOCTYPE</code> appears after any element or data character
208        has been seen.  The document is non-conforming.</p>
209        
210        <p>The <code>DOCTYPE</code> must be placed before any
211        tag, reference, or data character.  Only white space characters
212        and comments can be inserted before the <code>DOCTYPE</code>.</p>
213      </d:desc>
214    </d:item>
215    
216    <d:item name="in body"
217        class="parse-error">
218      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
219      is not allowed in <code>body</code>.</d:message>
220      <d:desc xml:lang="en">
221        <p>The start or end tag of an element, which
222        cannot be a descendant of <code>body</code> element, appears
223        in the input stream while the <code>body</code> element has been opened.
224        The document is non-conforming.</p>
225      </d:desc>
226    </d:item>
227    
228    <d:item name="in table"
229        class="parse-error">
230      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
231      is not allowed in <code>table</code>.</d:message>
232      <d:desc xml:lang="en">
233        <p>The start or end tag of an element, which
234        cannot be a child of <code>table</code> element, appears
235        in the input stream while the <code>table</code> element has been opened
236        but no other element has been opened.  The document is non-conforming.</p>
237    
238        <p>In <code>table</code>, only table related elements
239        are allowed; any other element must be contained in
240        <code>td</code> or <code>th</code> element to form
241        a part of the table, or <code>caption</code> element to create
242        a table caption.</p>
243      </d:desc>
244    </d:item>
245    
246    <d:item name="in table:#character"
247        class="parse-error">
248      <d:message xml:lang="en">Data character is not allowed in
249      <code>table</code>.</d:message>
250      <d:desc xml:lang="en">
251        <p>A data character appears in <code>table</code>.  The document
252        is non-conforming.</p>
253    
254        <p>In <code>table</code>, only table related elements
255        are allowed; any other element and data character must be contained in
256        <code>td</code> or <code>th</code> element to form
257        a part of the table, or <code>caption</code> element to create
258        a table caption.</p>
259      </d:desc>
260    </d:item>
261    
262    <d:item name="missing start tag:tr"
263        class="parse-error">
264      <d:message xml:lang="en">Start tag of <code>tr</code>
265      element is missing.</d:message>
266      <d:desc>
267        <p>Start tag of a <code>tr</code> element, which is <em>not</em>
268        optional, is missing.  The document is non-conforming.</p>
269    
270        <p>In a table section, a <code>&lt;tr></code> start tag
271        must occur before any <code>&lt;td></code> or
272        <code>&lt;th></code> start tag.  Though the HTML5 parser
273        implies the <code>&lt;tr></code> start tag before
274        these start tags, it must be explicitly specified.</p>
275      </d:desc>
276    </d:item>
277    
278    <d:item name="no DOCTYPE"
279        class="parse-error">
280      <d:message xml:lang="en">This document does not start with the
281      <code>DOCTYPE</code>.</d:message>
282      <d:desc>
283        <p>The document does not start with a <code>DOCTYPE</code>.
284        The document is non-conforming.</p>
285    
286        <p>An HTML document must start by a <code>DOCTYPE</code>:
287          <pre class="html example"><code>&lt;!DOCTYPE HTML></code></pre>
288        </p>
289    
290        <p>Only white space characters and comments are allowed
291        before the <code>DOCTYPE</code>.</p>
292      </d:desc>
293    </d:item>
294    
295    <d:item name="not closed"
296        class="parse-error">
297      <d:message xml:lang="en">Element <code><var>$0</var></code> is not
298      closed.</d:message>
299      <d:desc>
300        <p>End tag of an element is not found before, for example,
301        an end tag of another element appears or
302        the end of the document.  The document is non-conforming.</p>
303      </d:desc>
304    </d:item>
305    
306    <d:item name="not HTML5"
307        class="parse-error">
308      <d:message xml:lang="en">This document is written in an old version of
309      HTML.</d:message>
310      <d:desc xml:lang="en">
311        <p>The document contains a <code>DOCTYPE</code> declaration
312        that is different from HTML5 <code>DOCTYPE</code> (i.e. <code>&lt;!DOCTYPE
313        HTML&gt;</code>).  The document is non-conforming.</p>
314    
315        <p>The document might or might not be conformant to
316        some version of HTML.  However, conformance to any HTML
317        specification other than HTML5 provides for no practical
318        convenience, since Web borwsers will parse any
319        HTML document (roughly) as defined in HTML5.</p>
320      </d:desc>
321    </d:item>
322    
323    <d:item name="unmatched end tag"
324        class="parse-error">
325      <d:message xml:lang="en">Element <code><var>$0</var></code> is not
326      opened.</d:message>
327      <d:desc>
328        <p>An end tag appears though no element with the same name
329        has been opened.  The document is non-conforming.</p>
330    
331        <p>For any end tag in HTML document, there must be a
332        corresponding start tag.</p>
333      </d:desc>
334    </d:item>
335    
336    </section>
337    
338  <section id="element-content-model-errors">  <section id="element-content-model-errors">
339  <h2>Element Content Model Errors</h2>  <h2>Element Content Model Errors</h2>
340    
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343    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
344    context.</d:message>    context.</d:message>
345    <d:desc xml:lang="en">    <d:desc xml:lang="en">
346      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
347      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
348    
349      <p>Possible causes:      <p>Possible causes:
# Line 97  Web Document Conformance Checker (BETA)< Line 376  Web Document Conformance Checker (BETA)<
376    <d:desc xml:lang="en">    <d:desc xml:lang="en">
377      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
378      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
379      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
380    
381      <p>For example:      <p>For example:
382        <ul>        <ul>
# Line 117  Web Document Conformance Checker (BETA)< Line 396  Web Document Conformance Checker (BETA)<
396    or <code>th</code> element as a child of this element.</d:message>    or <code>th</code> element as a child of this element.</d:message>
397    <d:desc xml:lang="en">    <d:desc xml:lang="en">
398      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
399      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
400      such an element, the document is non-conforming.</p>      is non-conforming.</p>
401    </d:desc>    </d:desc>
402  </d:item>  </d:item>
403    
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406    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
407    context.</d:message>    context.</d:message>
408    <d:desc xml:lang="en">    <d:desc xml:lang="en">
409      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
410      is non-conforming.</p>      is non-conforming.</p>
411    
412        <p><strong>Note</strong>: The conformance checker does
413        <em>not</em> support form elements yet.</p>
414    
415      <p>Possible causes:      <p>Possible causes:
416        <dl>        <dl>
417        <dt>If the erred element is an inline-level element (such        <dt>If the erred element is an inline-level element (such
# Line 158  Web Document Conformance Checker (BETA)< Line 440  Web Document Conformance Checker (BETA)<
440    </d:desc>    </d:desc>
441  </d:item>  </d:item>
442    
443  enumerated:invalid;attribute-error;This attribute only allow a limited set of values and the specified value is not one of them.  </section>
444  no DOCTYPE;parse-error;This document does not start with the <code>DOCTYPE</code> declaration.  
445  not HTML5;parse-error;This document is written in an old version of HTML.  <section id="attribute-errors">
446  not closed;parse-error;Element <code>$0</code> is not closed.  <h2>Attribute Errors</h2>
447  unmatched end tag;parse-error;Element <code>$0</code> is not opened.  
448    <d:item name="attribute missing"
449  table:no cell in last row;table-model-error;The table has no cell (<code>td</code> or <code>th</code>) in the last row.      class="attribute-error">
450      <d:message xml:lang="en">Required attribute <code><var>$0</var></code>
451  s:IMT:obsolete subtype;should;An <em>obsolete</em> subtype is used.    is not specified.</d:message>
452  s:IMT:private subtype;should;A private (<code>x-</code> or <code>x.</code>) subtype is used.    <d:desc>
453  s:IMT:unregistered subtype;should;The subtype is not registered to IANA.      <p>A required attribute is not specified.  The document
454        is non-conforming.</p>
455    
456        <p>Some attribute is defined as <i>required</i>.
457        For example, any <code>img</code> element must have
458        <code>alt</code> and <code>src</code> attributes specified.
459        Without required attributes specified, user agents
460        cannot provide the full functionality of the element
461        to the user.</p>
462      </d:desc>
463    </d:item>
464    
465    <d:item name="in HTML:xml:lang"
466        class="attribute-error">
467      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
468      allowed in HTML document.</d:message>
469      <d:desc>
470        <p>The <code>xml:lang</code> attribute is not allowed in
471        HTML document.  The document is non-conforming.</p>
472    
473        <p>The <code>lang</code> attribute in the <code>null</code>
474        namespace for HTML elements is defined as conforming <em>only</em> for
475        XML document.</p>
476    
477        <p>To specify natural language information in HTML document,
478        use <code>lang</code> attribute instead.</p>
479        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
480             from an HTML document? -->
481      </d:desc>
482    </d:item>
483    
484    <d:item name="in XML:charset"
485        class="attribute-error">
486      <d:message xml:lang="en">The <code>charset</code> attribute is not
487      allowed in XML document.</d:message>
488      <d:desc>
489        <p>The <code>charset</code> attribute of a
490        <code>meta</code> element is not allowed in XML document.
491        The document is non-conforming.</p>
492    
493        <p>To specify the character encoding used for serialization,
494        if necessary, use XML declaration instead:
495          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
496        </p>
497      </d:desc>
498    </d:item>
499    
500    <d:item name="in XML:lang"
501        class="attribute-error">
502      <d:message xml:lang="en">The <code>lang</code> attribute is not
503      allowed in XML document.</d:message>
504      <d:desc>
505        <p>The HTML <code>lang</code> attribute is not allowed in
506        XML document.  The document is non-conforming.</p>
507    
508        <p>The <code>lang</code> attribute in <code>null</code>
509        namespace for HTML elements is defined as conforming <em>only</em> for
510        HTML document.</p>
511    
512        <p>To specify natural language information in XML document,
513        use <code>xml:lang</code> attribute instead.</p>
514      </d:desc>
515    </d:item>
516    
517    <d:item name="in XML:xmlns"
518        class="attribute-error">
519      <d:message xml:lang="en">The <code>xmlns</code> attribute
520      in the <code>null</code> namespace is not allowed in
521      XHTML document.  The document is non-conforming.</d:message>
522      <d:desc>
523        <p>The <code>xmlns</code> attribute in the <code>null</code>
524        namespace is not allowed in XHTML document.</p>
525    
526        <p>This error should not occur in conformance-checking
527        static documents.</p>
528      </d:desc>
529    </d:item>
530    
531    </section>
532    
533    <section id="attribute-value-errors">
534    <h2>Attribute Value Errors</h2>
535    
536    <d:item name="enumerated:invalid"
537        class="attribute-value-error">
538      <d:message xml:lang="en">This attribute only allow a limited set of
539      values and the specified value is not one of them.</d:message>
540    </d:item>
541    
542    <d:item name="duplicate ID"
543        class="attribute-value-error">
544      <d:message xml:lang="en">This identifier has already been
545      assigned to another element.</d:message>
546      <!-- @@ <id=a xml:id=a>? -->
547    </d:item>
548    
549    <d:item name="link type:bad-context"
550        class="attribute-value-error">
551      <d:message xml:lang="en">The link type <code><var>$0</var></code>
552      cannot be specified for this element.</d:message>
553      <d:desc xml:lang="en">
554        <p>The specified link type cannot be used for the element.
555        The document is non-conforming.</p>
556    
557        <p>Link types are associated with limited set of elements.
558        They cannot be used with other elements.</p>
559    
560        <p>For example, link type <code>bookmark</code>
561        can be used with <code>a</code> or <code>area</code> element,
562        while it cannot be used with <code>link</code> element.</p>
563      </d:desc>
564    </d:item>
565    
566    <d:item name="link type:non-conforming"
567        class="attribute-value-error">
568      <d:message xml:lang="en">The link type <code><var>$0</var></code>
569      is non-conforming.</d:message>
570      <d:desc xml:lang="en">
571        <p>The specified link type is non-conforming.  The entire document
572        is non-conforming.</p>
573    
574        <p>For example, in place of non-conforming link type <code>copyright</code>
575        you must use link type <code>license</code>.</p>
576      </d:desc>
577    </d:item>
578    
579    <d:item name="reserved browsing context name"
580        class="attribute-value-error">
581      <d:message xml:lang="en">This browsing context name is reserved.</d:message>
582      <d:item>
583        <p>The specified browsing context name is reserved.
584        The document is non-conforming.</p>
585    
586        <p>Names of browsing contexts starting with <code>_</code>
587        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
588        are reserved so that it must not be used.</p>
589    
590        <p>Old version of HTML, non-HTML markup languages, and
591        Web browsers define or implements special reserved
592        browsing context names <code>_blank</code>,
593        <code>_main</code>, and <code>_replace</code>.
594        However, they are <em>not</em> conforming attribute values.</p>
595      </d:item>
596    </d:item>
597    
598    </section>
599    
600    <section id="attribute-value-warnings">
601    <h2>Attribute Value Warnings</h2>
602    
603    <d:item name="link type:proposed" level="s"
604        class="attribute-value-warning should">
605      <d:message xml:lang="en">Link type <code><var>$0</var></code>
606      is proposed but not accepted yet; it <em>should not</em> be
607      used until it has been accepted.</d:message>
608      <d:desc>
609        <p>The link type is in the <i>proposed</i> status; it
610        <em>should not</em> be used until it has been
611        accepted.</p>
612    
613        <p><strong>Warning</strong>: The data served to the
614        conforming checker might be out of date; it might have already
615        been accepted or rejected, depending on which the document
616        might be conforming or non-conforming.  See WHATWG Wiki
617        for the latest information.</p>
618      </d:desc>
619    </d:item>
620    
621    </section>
622    
623    <section id="table-model-errors">
624    <h2>Table Model Errors</h2>
625    
626    <d:item name="table:colspan creates column with no anchored cell"
627        class="table-model-error">
628      <d:message xml:lang="en">This <code>colspan</code> attribute
629      results in creating a table column that does not contain
630      any cell anchored to it.</d:message>
631    </d:item>
632    
633    <d:item name="table:no cell in last row"
634        class="table-model-error">
635      <d:message xml:lang="en">The table has no cell (<code>td</code> or
636      <code>th</code>) in the last row.</d:message>
637    </d:item>
638    
639    </section>
640    
641    <section id="imt-warnings">
642    <h2>Internet Media Type Warnings</h2>
643    
644    <d:item name="IMT:obsolete subtype"
645        class="should" level="s">
646      <d:message xml:lang="en">An <em>obsolete</em> subtype is used.</d:message>
647    </d:item>
648    
649    <d:item name="IMT:private subtype"
650        class="should" level="s">
651      <d:message xml:lang="en">A private (<code>x-</code> or <code>x.</code>)
652      subtype is used.</d:message>
653    </d:item>
654    
655    <d:item name="IMT:unregistered subtype"
656        class="should" level="s">
657      <d:message xml:lang="en">The subtype is not registered to IANA.</d:message>
658    <!-- TODO: Unknown message?? -->
659    </d:item>
660    
661    </section>
662    
663    <section id="uri-errors">
664    <h2>URI (or IRI) Errors</h2>
665    
666    <d:item name="URI::syntax error"
667        class="must" level="m">
668      <d:message xml:lang="en">This string is not an IRI syntactically.</d:message>
669    </d:item>
670    
671    </section>
672    
673    <section id="uri-warnings">
674    <h2>URI (or IRI) Warnings</h2>
675    
676    <d:item name="URI::dot-segment"
677        class="should" level="s">
678      <d:message xml:lang="en">Dot-segment (<code>.</code> or
679      <code>..</code>) should not occur in an absolute reference.</d:message>
680      <d:desc>
681        <p>Dot-segment (<code>.</code> or <code>..</code>) should
682        not occur in an absolute reference.</p>
683    
684        <p>In relative references, dot-segments are used to represent
685        the current (<code>.</code>) or the parent (<code>..</code>)
686        hierarchy of the path.  Though they are also allowed
687        in absolute references, it should be resolved to the
688        canonical form before it has been published.</p>
689      </d:desc>
690    </d:item>
691    
692    <d:item name="URI::empty path"
693        class="should" level="s">
694      <d:message xml:lang="en">This IRI should explicitly end with
695      <code>/</code>.</d:message>
696    </d:item>
697    
698  s:URI::empty path;should;This IRI should explicitly end with <code>/</code>.  <d:item name="URI::lowercase hexadecimal digit"
699  m:URI::syntax error;must;This IRI is not syntactically valid.      class="should" level="s">
700      <d:message xml:lang="en">Hexadecimal digit in percent-encoding
701      should be in lowercase.</d:message>
702      <d:desc xml:lang="en">
703        <p>The hexadecimal digit in percent-encoding string in the IRI
704        is in lowercase.  Though the IRI <em>is</em> conforming,
705        it should be in uppercase.</p>
706      </d:desc>
707    </d:item>
708    
709    <d:item name="URI::percent-encoded unreserved"
710        class="should" level="s">
711      <d:message xml:lang="en">An unreserved character is
712      percent-encoded.</d:message>
713      <d:desc xml:lang="en">
714        <p>An unreserved character is percent-encoded in the IRI.
715        Though it <em>is</em> conforming, it should be in the
716        decoded (or bare) form.</p>
717      </d:desc>
718    </d:item>
719    
720  </section>  </section>
721    
722  <section id="unsupported-messages">  <section id="unsupported-messages">
723  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
724    
725  <d:item name="unsupported:attribute"  <d:item name="attribute"
726      class="unsupported">      class="unsupported" level="unsupported">
727    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">This attribute is not supported by the
728    conformance checker; <em>it might or might not be conforming</em>.</d:message>    conformance checker; <em>it might or might not be conforming</em>.</d:message>
729    <d:desc xml:lang="en">    <d:desc xml:lang="en">
# Line 188  m:URI::syntax error;must;This IRI is not Line 732  m:URI::syntax error;must;This IRI is not
732    </d:desc>    </d:desc>
733  </d:item>  </d:item>
734    
735  <d:item name="unsupported:element"  <d:item name="element"
736      class="unsupported">      class="unsupported" level="unsupported">
737    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">This element is not supported by the
738    conformance checker; <em>it might or might not be conforming</em>.</d:message>    conformance checker; <em>it might or might not be conforming</em>.</d:message>
739    <d:desc xml:lang="en">    <d:desc xml:lang="en">
# Line 198  m:URI::syntax error;must;This IRI is not Line 742  m:URI::syntax error;must;This IRI is not
742    </d:desc>    </d:desc>
743  </d:item>  </d:item>
744    
745  <d:item name="unsupported:link type"  <d:item name="link type"
746      class="unsupported">      class="unsupported" level="unsupported">
747    <d:message xml:lang="en">The link type <code>$0</code> is not standardized    <d:message xml:lang="en">The link type <code><var>$0</var></code> is not
748    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
749    <em>it is non-conforming unless it has now been registered</em>.</d:message>    checker; <em>it is non-conforming unless it has now been
750      registered</em>.</d:message>
751    <d:desc xml:lang="en">    <d:desc xml:lang="en">
752      <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.
753      Some common link types are defined in the HTML5 specification.      Some common link types are defined in the HTML5 specification.
# Line 217  m:URI::syntax error;must;This IRI is not Line 762  m:URI::syntax error;must;This IRI is not
762    </d:desc>    </d:desc>
763  </d:item>  </d:item>
764    
765    <d:item name="event handler"
766        class="unsupported" level="unsupported">
767      <d:message xml:lang="en">Conformance checking for event handler attribute
768      is not supported; <em>it might or might not be conforming.</em></d:message>
769    </d:item>
770    
771    <d:item name="language tag"
772        class="unsupported" level="unsupported">
773      <d:message xml:lang="en">Conformance checking for language tag
774      is not supported; <em>it might or might not be conforming.</em></d:message>
775    </d:item>
776    
777    <d:item name="media query"
778        class="unsupported" level="unsupported">
779      <d:message xml:lang="en">Conformance checking for media query
780      is not supported; <em>it might or might not be conforming.</em></d:message>
781    </d:item>
782    
783    <d:item name="script"
784        class="unsupported" level="unsupported">
785      <d:message xml:lang="en">Conformance checking for script
786      language <code><var>$0</var></code> is not supported;
787      <em>it might or might not be conforming.</em></d:message>
788    </d:item>
789    
790    <d:item name="style"
791        class="unsupported" level="unsupported">
792      <d:message xml:lang="en">Conformance checking for style
793      language <code><var>$0</var></code> is not supported;
794      <em>it might or might not be conforming.</em></d:message>
795    </d:item>
796    
797  </section>  </section>
798    
799    <d:catalog>
800    manakaiCompatMode:quirks;;Quirks Mode
801    manakaiCompatMode:limited quirks;;Limited Quirks Mode
802    manakaiCompatMode:no quirks;;No Quirks Mode
803    
804    manakaiIsHTML:1;;HTML Document
805    manakaiIsHTML:0;;XML Document
806    </d:catalog>
807    
808  <section id="license">  <section id="license">
809  <h2>License of This Document</h2>  <h2>License of This Document</h2>
810    
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