V-olymp.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Bad value “https://www.w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Element “noindex” not allowed as child of element “form” 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.
Element “p” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
No “p” element in scope but a “p” end tag seen.
The “font” element is obsolete. Use CSS instead.
Element “noindex” not allowed as child of element “font” in this context. (Suppressing further errors from this subtree.)
Start tag “a” seen but an element of the same type was already open.
End tag “p” seen, but there were open elements.
Unclosed element “a”.
End tag “div” seen, but there were open elements.
End tag for “body” seen, but there were unclosed elements.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
The “type” attribute is unnecessary for JavaScript resources.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Empty heading.
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