$0 is not allowed for HTML document.
s:character encoding;format-charset should;Character encoding $0 should not be used for HTML document.
w:character encoding;format-charset warning;Use of UTF-8 is encouraged.
unsupported:character encoding;format-charset unsupported;Conformance for character encoding requirements cannot be checked.
m:no character encoding declaration;format-charset error;There is no character encoding declaration.
m:non ascii superset;format-charset error;No character encoding metadata is found in lower‐level protocol nor is there BOM, while character encoding $0 is not a superset of ASCII.
w:charset label detected;format-charset warning;While parsing the document as $0, a character encoding declaration specifying character encoding as $1 is found. The document is reparsed.
after html;parse-error;Tag <$0> is not allowed after the end tag </html>.
after body;parse-error;Tag <$0> is not allowed after the end tag </body>.
bare ero;tokenize-error;The & character must be escaped as &.
bare etago;tokenize-error;A </ string is not followed by a tag name.
bare stago;tokenize-error;A < character is not followed by tag name or by a ! character.
bare nero;tokenize-error;The decimal representation of the code position of a character must be specified after &#.
bare hcro;tokenize-error;The hexadecimal representation of the code position of a character must be specified after &#x.
bogus comment;tokenize-error;String <! is not followed by --.
bogus end tag;tokenize-error;String </ is not followed by tag name.
dash in comment;tokenize-error;There is a -- sequence in a comment.
duplicate attribute;tokenize-error;There are two attributes with name $0.
nestc;tokenize-error;Polytheistic slash (/>) cannot be used for this element.
pio;tokenize-error;Processing instruction (<?...>) cannot be used.
after head;parse-error;The $0 element cannot be inserted between head and body elements.
DOCTYPE in the middle;parse-error;A DOCTYPE appears after any element or data character has been seen.
in a:a;parse-error;Anchor cannot be nested.
in body;parse-error;Tag <$0> is not allowed in the body element.
in head:head;parse-error;Start tag <head> is not allowed in the head element.
in table;parse-error;Tag <$0> is not allowed in a table element.
in table:#character;parse-error;Data character is not allowed in table.
missing start tag:tr;parse-error;Start tag of tr element is missing.
no DOCTYPE;parse-error;This document does not start with a DOCTYPE.
not closed;parse-error;Element $0 is not closed.
not first start tag;parse-error;This <html> tag is not the first start tag.
not HTML5;parse-error;This document is written in an old version of HTML.
unmatched end tag;parse-error;Element $0 is not opened.
character not allowed;content-model-error;Data character is not allowed in this context.
child element missing;content-model-error;There must be a $0 element as a child of this element.
child element missing:td|th;content-model-error;There must be a td or th element as a child of this element.
element not allowed;content-model-error;This element is not allowed in this context.
element not allowed:root;content-model-error;This element is not allowed as a root element.
ps element missing;content-model-error;There is no $0 element before this element.
attribute missing;attribute-error;Required attribute $0 is not specified.
attribute not allowed;attribute-error;Attribute {local-name} is not allowed for {element-local-name} element.
in HTML:xml:lang;attribute-error;The xml:lang attribute is not allowed in HTML document.
in XML:charset;attribute-error;The charset attribute is not allowed in XML document.
in XML:lang;attribute-error;The lang attribute is not allowed in XML document.
in XML:xmlns;attribute-error;The xmlns attribute in the null namespace is not allowed in XHTML document. The document is non-conforming.
w:charset:not registered;attribute-value-warning warning;Character encoding name $0 is not registered.
w:charset:private;attribute-value-warning warning;$0 is a private character encoding name.
m:charset:syntax error;attribute-value-error;The specified value is syntactically not a character encoding name.
enumerated:invalid;attribute-value-error;This attribute only allow a limited set of values and the specified value {@} is not one of them.
enumerated:invalid:http-equiv:content-type;attribute-value-error;Character encoding declaration syntax <meta http-equiv="Content-Type" content="text/html; charset=charset-name"> is obsolete.
duplicate ID;attribute-value-error;This identifier has already been assigned to another element.
link type:bad context;attribute-value-error;The link type $0 cannot be specified for this element.
link type:non-conforming;attribute-value-error;The link type $0 is non-conforming.
m:mismatched charset name;attribute-value-error;Character encoding name $1 is different from document character encoding $0.
reserved browsing context name;attribute-value-error;Browsing context name {@} is reserved.
s:link type:proposed;attribute-value-warning should;Link type $0 is proposed but not accepted yet; it should not be used until it has been accepted.
table:colspan creates column with no anchored cell;table-model-error;This colspan attribute results in creating a table column that does not contain any cell anchored to it.
table:no cell in last row;table-model-error;The table has no cell (td or th) in the last row.
table:rowspan extends table;table-model-error;This rowspan attribute results in creating a table row that does not contain any cell anchored to it.
s:IMT:obsolete subtype;should;{@}: An obsolete subtype is used.
s:IMT:private subtype;should;{@}: A private (x- or x.) subtype is used.
s:IMT:unregistered subtype;should;{@}: The subtype is not registered to IANA.
m:URI::syntax error;must;The specified value is syntactically not an IRI reference.
s:URI::dot-segment;should;A dot-segment (. or ..) occurs in an absolute reference.
s:URI::empty path;should;This IRI does not end with a /.
s:URI::lowercase hexadecimal digit;should;A lowercase hexadecimal digit is used in percent-encoding.
s:URI::percent-encoded unreserved;should;An unreserved character is percent-encoded.
s:URI::uppercase scheme name;should;URI scheme name is in uppercase.
m:not manifest;must;This document is not a cache manifest.
i:status:cr:element;level-i;This element is in the call for implementation stage.
i:status:lc:element;level-i;This element is in the last call for comments stage.
i:status:wd:element;level-i;This element is documented in a working draft.
i:status:non-standard:element;level-i;This element is not part of any standard the conformance checker knows.
unsupported:element;unsupported;Conformance checking for element {local-name} is not supported; it might or might not be conforming.
unsupported:attribute;unsupported;Conformance checking for attribute {local-name} of element {element-local-name} is not supported; it might or might not be conforming.
unsupported:link type;unsupported;Link type $0 is not standardized or registered at the time of the release of the conformance checker; it is non-conforming unless it now has been registered.
unsupported:event handler;unsupported;Conformance checking for event handler attribute is not supported; it might or might not be conforming.
unsupported:media query;unsupported;Conformance checking for media query is not supported; it might or might not be conforming.
unsupported:script;unsupported;Conformance checking for script language $0 is not supported; it might or might not be conforming.
unsupported:style;unsupported;Conformance checking for style language $0 is not supported; it might or might not be conforming.
WebHACC:Title;;WebHACC (β)
WebHACC:Heading;; innerHTML of HTML element
Information;;Information
HTTP Header;;HTTP Header
Parse Errors Section;;Parse Errors
Parse Errors;;Parse Errors
Document Source;;Document Source
Source;;Source
Tables Section;;Structure of Tables
Tables;;Tables
Document Tree;;Document Tree
Tree;;Tree
Document;;Document
Document Structure;;Document Structure
Structure;;Structure
Reformatted Document Source;;Reformatted Document Source
Reformatted;;Reformatted
Structural Errors;;Structural Errors
Struct. Errors;;Struct. Errors
Transfer Errors;;Transfer Errors
Trans. Errors;;Trans. Errors
Result;;Result
manakaiCompatMode:quirks;;Quirks Mode
manakaiCompatMode:limited quirks;;Limited Quirks Mode
manakaiCompatMode:no quirks;;No Quirks Mode
manakaiIsHTML:1;;HTML Document
manakaiIsHTML:0;;XML Document
manakaiCharset;;charset parameter
inputEncoding;;Input character encoding
xmlVersion;;XML version
xmlEncoding;;XML encoding
xmlStandalone;;XML standalone
... with BOM;; (with BOM)
URL;;URL
URLs;;URLs
Container Node;;Container Node
Table Element;;Table Element
Base URL;;Base URL
Internet Media Type;;Internet Media Type
Character Encoding;;Character Encoding
Byte Length;;Byte Length
Character Length;;Character Length
... overridden;; (overridden)
... overridden, official type is #;; (overridden; official type is {text})
... sniffed;; (sniffed)
byte;;byte
bytes;;bytes
character;;character
characters;;characters
Line #;;Line {text}
column #;;column {text}
Index #;;Index {text}
Unknown location;;Unknown location
Table #;;Structure of Table #{text}
Subdocument #;;Subdocument #{text}
Sub #;;Sub #{text}
...;;..
Score;;Score
Subtotal;;Subtotal
Total;;Total
Main document;;Main document
Subdocuments;;Subdocuments
Transfer L.;;Transfer
Encode L.;;Encoding
Char L.;;Character
Syntax L.;;Syntax
Structure L.;;Structure
Semantics L.;;Semantics
N/A;;N/A
No error found.;;No error found.
No transfer error found.;;This document has no transfer protocol header error.
No parse error found.;;This document has no parse error.
No structural error found.;;This document has no structral error.
This checker is work in progress.;; Important: This conformance checking service is under development. The result above might be wrong.
Conformance is conforming;;No conformance‐error is found in this document. Conformance is should-error;;This document is likely non-conforming, but in rare case it might be conforming. The checker cannot determine whether this document is in the rare case or not. Conformance is non-conforming;;This document is non-conforming. Conformance is uncertain;;The conformance checker cannot decide whether the document is conforming or not, since the document contains one or more unsupported features. The document might or might not be conforming. Error level m;;MUST‐level error Error level s;;SHOULD‐level error Error level w;;Warning Error level i;;Information Error level u;;Not supported