Ecam.fr 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.
Element “smallnav” not allowed as child of element “header” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “h2” seen, but there were open elements.
Unclosed element “span”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “button” role is unnecessary for element “button”.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
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