Aitcofficial.org 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 “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “screen, projection” for attribute “media” on element “link”: Deprecated media type “projection”. For guidance, see the Media Types section in the current Media Queries specification.
Text not allowed in element “iframe” in this context.
Bad value “url noopener noreferrer” for attribute “rel” on element “a”: The string “url” is not a registered keyword.
Stray end tag “div”.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Text run is not in Unicode Normalization Form C.
The “contentinfo” role is unnecessary for element “footer”.
Attribute “aria-required” is unnecessary for elements that have attribute “required”.
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