Mersenne.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Bad value “PICS-Label” for attribute “http-equiv” on element “meta”.
Bad value “pics-Label” for attribute “http-equiv” on element “meta”.
Element “style” not allowed as child of element “nav” in this context. (Suppressing further errors from this subtree.)
Element “hr” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The element “button” must not appear as a descendant of the “a” element.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate attribute “target”.
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