Uclouvain.be W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “alt” not allowed on element “a” at this point.
Element “style” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “h3” 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.
Warnings:
The “banner” role is unnecessary for element “header”.
The “type” attribute is unnecessary for JavaScript resources.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “type” attribute for the “style” element is not needed and should be omitted.
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).
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