Cwi.nl W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
Element “script” must not have attribute “charset” unless attribute “src” is also specified.
Attribute “viewport” not allowed on element “svg” at this point.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The element “h3” must not appear as a descendant of the “address” element.
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