Joox.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “zh_hk” for attribute “lang” on element “html”: The language subtag “zh_hk” is not a valid language subtag.
Attribute “gl” not allowed on element “a” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “ref” not allowed on element “a” at this point.
Attribute “req” not allowed on element “a” at this point.
Attribute “none” not allowed on element “div” at this point.
Attribute “pages” not allowed on element “ul” at this point.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “seamless” not allowed on element “iframe” at this point.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The “navigation” role is unnecessary for element “nav”.
Empty heading.
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