Fenaco.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.
Text not allowed in element “iframe” in this context.
Attribute “hreflang” not allowed on element “li” at this point.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Bad value “article” for attribute “role” on element “a”.
Attribute “about” not allowed on element “a” at this point.
The element “button” must not appear as a descendant of the “a” element.
Attribute “about” not allowed on element “li” at this point.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “article” role is unnecessary for element “article”.
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