Francedimanche.fr W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “true” for attribute “async” on element “script”.
Bad value “” for attribute “id” on element “ul”: An ID must not be the empty string.
Duplicate ID “”.
Duplicate ID “logo”.
Duplicate ID “headingOne”.
Duplicate attribute “xmlns”.
Bad value “http://www.w3.org/1999/html” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Attribute “allow” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The first occurrence of ID “” was here.
The first occurrence of ID “logo” was here.
The first occurrence of ID “headingOne” was here.
Attribute “xmlns” is not serializable as XML 1.0.
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