Shape.com W3C HTML Markup Validation
HTML markup errors and warnings
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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”.
Bad value “true” for attribute “async” on element “script”.
Bad value “x-dns-prefetch-control” for attribute “http-equiv” on element “meta”.
Attribute “datatype” not allowed on element “a” at this point.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “main” role is unnecessary for element “main”.
The “article” role is unnecessary for element “article”.
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