Stackoverflow.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “itemprop” not allowed on element “meta” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “and” not allowed on element “a” at this point.
Attribute “aria-expanded” not allowed on element “input” at this point.
Element “div” not allowed as child of element “label” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “aria-describedby” attribute must point to an element in the same document.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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