The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.
Using experimental feature:
HTML5 Conformance Checker.
The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies. If you find any issue with this feature, please report them. Thank you.
Line 502, Column 67:
The summary attribute is obsolete. Consider describing the structure of complex tables in <caption> or in a paragraph and pointing to the paragraph using the aria-describedby attribute.
…_wrap"><table id="wp-calendar" summary="Calendar">
Line 506, Column 47:
Attribute abbr not allowed on element th at this point.
<th abbr="Monday" scope="col" title="Monday">M</th> <th abbr="Tuesday" scope="col" title="Tuesday">T</th> <th abbr="Wednesday" scope="col" title="Wednesday">W</th> <th abbr="Thursday" scope="col" title="Thursday">T</th> <th abbr="Friday" scope="col" title="Friday">F</th> <th abbr="Saturday" scope="col" title="Saturday">S</th> <th abbr="Sunday" scope="col" title="Sunday">S</th>…bbr="November" colspan="3" id="prev">td:colspanrowspanheaders