Oup.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “type” attribute for the “style” element is not needed and should be omitted.
The first occurrence of ID “header” was here.
The “button” role is unnecessary for element “button”.
The first occurrence of ID “footer” was here.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
Errors:
Duplicate ID “header”.
Start tag “a” seen but an element of the same type was already open.
Element “p” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “srcset” on element “img”: Must contain one or more image candidate strings.
End tag “li” implied, but there were open elements.
Unclosed element “a”.
No “a” element in scope but a “a” end tag seen.
Duplicate ID “footer”.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Stray end tag “a”.
The “longdesc” attribute on the “img” element is obsolete. Use a regular “a” element to link to the description.
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