Mir-kubikov.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “http://www.w3.org/1999/html” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.
Attribute “leftmargin” not allowed on element “body” at this point.
Attribute “topmargin” not allowed on element “body” at this point.
The “marginwidth” attribute on the “body” element is obsolete. Use CSS instead.
The “marginheight” attribute on the “body” element is obsolete. Use CSS instead.
The “bgcolor” attribute on the “body” element is obsolete. Use CSS instead.
Element “noindex” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “from” not allowed on element “li” at this point.
The element “button” must not appear as a descendant of the “a” element.
Saw a “form” start tag, but there was already an active “form” element. Nested forms are not allowed. Ignoring the tag.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Consider avoiding viewport values that prevent users from resizing documents.
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