Dassault-aviation.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “name” not allowed on element “link” at this point.
Attribute “content” not allowed on element “link” at this point.
Element “link” is missing one or more of the following attributes: “href”, “itemprop”, “property”, “rel”.
Bad value “http://www.w3.org/1999/xlink/” for the attribute “xmlns:link” (only “http://www.w3.org/1999/xlink” permitted here).
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “contentinfo” role is unnecessary for element “footer”.
Attribute “xmlns:xlink” with a value other than “http://www.w3.org/1999/xlink” is not serializable as XML 1.0 without changing document semantics.
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