Webwinkelvakdagen.nl W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “a” instead.
Bad value “” for attribute “name” on element “button”: Must not be empty.
Attribute “hreflang” not allowed on element “li” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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).
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
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