Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Element “meta” is missing required attribute “content”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
An element with “role=menuitem” must be contained in, or owned by, an element with “role=menubar” or “role=menu”.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
End tag “a” violates nesting rules.
Bad value “100%” for attribute “height” on element “video”: Expected a digit but saw “%” instead.
Bad value “100%” for attribute “width” on element “video”: Expected a digit but saw “%” instead.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Discarding unrecognized token “navigation ” from value of attribute “role”. Browsers ignore any token that is not a defined ARIA non-abstract role.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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