<$0>
+ is not allowed after the end tag </html>.The start or end tag of an element appears after the
+ html element has been closed. The document is
+ non-conforming.
Any content of the document other than comments
+ must be put into the html element.
& character must
+ introduce a reference.An & (U+0026
+ AMPERSAND) character which
+ is not part of any reference appears in the input stream.
+ The document is non-conforming.
The & character must
+ be the first character of a reference:
+
+&entity-name;
+ where entity-name is the name of the
+ character entity to be referenced.
+&#d;
+ where d is the decimal representation of
+ the code position of the character to be referenced.
+&#xh;
+ where h is the hexadecimal representation
+ of the code position of the character to be referenced.To represent & as a data character, use
+ named entity reference:
+
+&
+
+ &#.An & (U+0026
+ AMPERSAND) character immediately
+ followed by a # (U+0023
+ NUMBER SIGN) character which
+ is not part of any reference appears in the input stream.
+ The document is non-conforming.
The string &# must be the first two characters
+ NUMBER SIGN) character must be the first two characters
+ of a reference:
+
+&#d;
+ where d is the decimal representation of
+ the code point of the character to be referenced.
+&#xh;
+ where h is the hexadecimal representation
+ of the code point of the character to be referenced.To represent &# as data characters, use
+ named entity reference:
+
+&#
+
+ &#x.The string &#x or &#X which
+ is not part of any reference appears in the input stream.
+ The document is non-conforming.
The string &#x or &#X must
+ be the first three characters of a hexadecimal reference:
+
+&#xh;
+ where h is the hexadecimal representation
+ of the code point of the character to be referenced.
+
+ To represent &#x as data characters, use
+ named entity reference:
+
+&#x
+
+ Attributes must be unique in an element. Specifying - attributes with same name more than once is non-conforming.
+There are more than one attributes with the same + name in a tag. The document is non-conforming.
The motion attribute is not part of the HTML standard.
Use img element with animation GIF instead.
/>) cannot be
used for this element.The void element syntax /> syntax can only be
+
Void element syntax (/>) must not be used
+ for the element. The document is non-conforming.
The void element syntax can only be
used for base, link, meta,
hr, br, img,
embed, param, area,
- col, and input elements.
- For any other elements, using that syntax is non-conforming.
col, and input elements.
- Unlike XML, the void element syntax (/>) has
+
Note that, unlike in XML, the void element syntax has no effect in HTML.
$0 element cannot be
inserted between head and body elements.A start tag occurs after the head element is closed
+
A start tag appears after the head element is closed
but before the body element is opened.
The document is non-conforming.
<$0>
+ is not allowed in table.The start or end tag of an element appears in table.
+ The document is non-conforming.
In table, only table related elements
+ are allowed; any other element must be contained in
+ td or th element to form
+ a part of the table, or caption element to create
+ a table caption.
table.A data character appears in table. The document
+ is non-conforming.
In table, only table related elements
+ are allowed; any other element and data character must be contained in
+ td or th element to form
+ a part of the table, or caption element to create
+ a table caption.
tr
+ element is missing.Start tag of a tr element, which is not
+ optional, is missing. The document is non-conforming.
In a table section, a <tr> start tag
+ must occur before any <td> or
+ <th> start tag. Though the HTML5 parser
+ implies the <tr> start tag before
+ these start tags, it must be explicitly specified.
DOCTYPE declaration.DOCTYPE.
+ The document does not start with a DOCTYPE.
+ The document is non-conforming.
An HTML document must start by a DOCTYPE:
+
+<!DOCTYPE HTML>
+
+
+ Only white space characters and comments are allowed
+ before the DOCTYPE.
$0 is not
- closed.End tag of an element is not found before, for example, + an end tag of another element appears or + the end of the document. The document is non-conforming.
+The document contains a DOCTYPE declaration
+ that is different from HTML5 DOCTYPE (i.e. <!DOCTYPE
+ HTML>). The document is non-conforming.
The document might or might not be conformant to + some version of HTML. However, conformance to any HTML + specification other than HTML5 provides for no practical + convenience, since Web borwsers will parse any + HTML document (roughly) as defined in HTML5.
+$0 is not
opened.A data character occurs where it is not allowed in this +
A data character appears where it is not allowed in this context. The document is non-conforming.
Possible causes: @@ -92,7 +253,7 @@ element as a child of this element.
The content model of the element is so defined that it
must contain a $0 child element.
- Without such an element, the document is non-conforming.
For example:
td
or th element as a child of this element.The tr element must contain at least one
- td or th child element. Without
- such an element, the document is non-conforming.
td or th child element. The document
+ is non-conforming.
An element occurs where it is not allowed. The document +
An element appears where it is not allowed. The document is non-conforming.
+Note: The conformance checker does + not support form elements yet.
+Possible causes:
$0
+ is not specified.A required attribute is not specified. The document + is non-conforming.
+ +Some attribute is defined as required.
+ For example, any img element must have
+ alt and src attributes specified.
+ Without required attributes specified, user agents
+ cannot provide the full functionality of the element
+ to the user.
xml:lang attribute is not
+ allowed in HTML document.The xml:lang attribute is not allowed in
+ HTML document. The document is non-conforming.
The xml:lang attribute in null
+ namespace for HTML elements is defined as conforming only for
+ XML document.
To specify natural language information in HTML document,
+ use lang attribute instead.
charset attribute is not
+ allowed in XML document.The charset attribute of a
+ meta element is not allowed in XML document.
+ The document is non-conforming.
To specify the character encoding used for serialization, + if necessary, use XML declaration instead: +
+<?xml version="1.0" encoding="encoding-name"?>
+
+ lang attribute is not
+ allowed in XML document.The HTML lang attribute is not allowed in
+ XML document. The document is non-conforming.
The lang attribute in null
+ namespace for HTML elements is defined as conforming only for
+ HTML document.
To specify natural language information in XML document,
+ use xml:lang attribute instead.
xmlns attribute
+ in the null namespace is not allowed in
+ XHTML document. The document is non-conforming.The xmlns attribute in the null
+ namespace is not allowed in XHTML document.
This error should not occur in conformance-checking + static documents.
+colspan attribute
+ results in creating a table column that does not contain
+ any cell anchored to it.td or
th) in the last row.. or
+ ..) should not occur in an absolute reference.Dot-segment (. or ..) should
+ not occur in an absolute reference.
In relative references, dot-segments are used to represent
+ the current (.) or the parent (..)
+ hierarchy of the path. Though they are also allowed
+ in absolute references, it should be resolved to the
+ canonical form before it has been published.
/.