K12.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “contentinfo” for attribute “role” on element “header”.
Bad element name “gcse:searchbox-only”: Code point “U+003A” is not allowed
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “true” for attribute “required” on element “input”.
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
Bad value “1” for attribute “allowfullscreen” on element “iframe”.
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
Element name “gcse:searchbox-only” cannot be represented as XML 1.0.
The “navigation” role is unnecessary for element “nav”.
The “button” role is unnecessary for element “button”.
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