D21.co.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Bad value “Top” for attribute “rel” on element “link”: The string “Top” is not a registered keyword.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
No “li” element in scope but a “li” end tag seen.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
Potentially bad value “Copyright” for attribute “rel” on element “link”: The keyword “copyright” for the “rel” attribute should not be used. Consider using “license” instead.
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