Vdyoutube.com 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.
The “scrolling” attribute on the “iframe” element is obsolete.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The “frameborder” attribute on the “iframe” element is obsolete.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The “allowtransparency” attribute on the “iframe” element is obsolete.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.
Bad value “trl” for attribute “dir” on element “ul”.
End tag “nav” seen, but there were open elements.
Unclosed element “div”.
The element “button” must not appear as a descendant of the “a” element.
Stray end tag “img”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “center” element is obsolete. Use CSS instead.
Duplicate attribute “class”.
Element “img” is missing required attribute “src”.
Stray end tag “div”.
Warnings:
The “navigation” role is unnecessary for element “nav”.
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