Nobelbiocare.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bogus comment.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “img” is missing required attribute “src”.
Bad value “” for attribute “usemap” on element “img”: The empty string is not a valid hash-name reference.
The element “img” with the attribute “usemap” must not appear as a descendant of the “a” element.
The element “button” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
The “main” role is unnecessary for element “main”.
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