Kluwer.nl W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
An element with “role=menuitem” must be contained in, or owned by, an element with “role=menubar” or “role=menu”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate attribute “href”.
Attribute “type” not allowed on element “menu” at this point.
Duplicate ID “main-content”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The element “header” must not appear as a descendant of the “footer” element.
Bad value “tel:0570 673 555” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
Bogus comment.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Warnings:
The first occurrence of ID “main-content” was here.
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.
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
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