Errors:
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Duplicate ID “industrialContent”.
Duplicate ID “aerospaceContent”.
Duplicate ID “medicalContent”.
Duplicate ID “transportContent”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “button” for attribute “type” on element “a”: Subtype missing.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
The element “footer” must not appear as a descendant of the “footer” element.
Bad value “” for attribute “name” on element “button”: Must not be empty.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “industrialContent” was here.
The first occurrence of ID “aerospaceContent” was here.
The first occurrence of ID “medicalContent” was here.
The first occurrence of ID “transportContent” was here.
The “article” role is unnecessary for element “article”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
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