Schoolsolver.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Element “blue” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “blue” not allowed as child of element “h4” in this context. (Suppressing further errors from this subtree.)
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
End tag “li” implied, but there were open elements.
Unclosed element “div”.
Bad value “/questions/?category=Computer Science” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “/questions/?category=General Questions” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
End tag “ul” seen, but there were open elements.
Bad value “80px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “80px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “navigation” role is unnecessary for element “nav”.
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