Warnings:
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
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).
Attribute “addthis:url” is not serializable as XML 1.0.
Attribute “addthis:title” is not serializable as XML 1.0.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
Bad value “katholiekonderwijs.vlaanderen” for attribute “rel” on element “a”: The string “katholiekonderwijs.vlaanderen” is not a registered keyword.
Bad value “highlight” for attribute “role” on element “section”.
Bad value “content” for attribute “role” on element “section”.
Attribute “nid” not allowed on element “li” at this point.
Attribute “addthis:url” not allowed on element “div” at this point.
Attribute “addthis:title” not allowed on element “div” 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.
Attribute “labeltext” not allowed on element “input” at this point.
Attribute “alt” not allowed on element “input” at this point.
Bad value “true” for attribute “checked” on element “input”.
The “border” attribute on the “table” element is obsolete. Use CSS instead.
Bad value “complimentary” for attribute “role” on element “aside”.
Bad value “40px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “40px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
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