Tbs.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Bad value “OFF” for attribute “autocomplete” on element “input”: The string “off” is not a valid autofill field name.
Attribute “alt” not allowed on element “a” at this point.
Attribute “altxzl” not allowed on element “a” at this point.
Element “navigation” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
The element “footer” must not appear as a descendant of the “footer” element.
Attribute “valign” not allowed on element “img” at this point.
The “aria-labelledby” attribute must point to an element in the same document.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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