Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Attribute “xfbml:fb” not allowed on element “html” 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.
Element “img” is missing required attribute “src”.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Attribute “href” not allowed on element “span” at this point.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
The “language” attribute on the “script” element is obsolete. Use the “type” attribute instead.
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Warnings:
Attribute “xfbml:fb” is not serializable as XML 1.0.
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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