Paris.fr W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
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”.
Errors:
The element “button” must not appear as a descendant of the “a” element.
Attribute “align” not allowed on element “blockquote” at this point.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Bad value “100%” for attribute “height” on element “iframe”: Expected a digit but saw “%” instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Bad value “true” for attribute “async” on element “script”.
Bad value “true” for attribute “defer” on element “script”.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
The “aria-controls” attribute must point to an element in the same document.
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