Heijmans.nl W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “DC.contributor” for attribute “rel” on element “link”: The string “DC.contributor” is not a registered keyword.
The text content of element “time” was not in the required format: The literal did not satisfy the time-datetime format.
The “frameborder” attribute on the “iframe” element is obsolete.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.
Stray end tag “section”.
Warnings:
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
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).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
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