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).
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “checked” not allowed on element “input” at this point.
Duplicate ID “login_btn”.
Element “noindex” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “valign” attribute on the “td” element is obsolete. Use CSS instead.
The “align” attribute on the “td” element is obsolete. Use CSS instead.
The “width” attribute on the “td” element is obsolete. Use CSS instead.
Duplicate ID “menu1”.
End tag “div” seen, but there were open elements.
Unclosed element “nofollow”.
Unclosed element “noindex”.
Stray end tag “nofollow”.
Stray end tag “noindex”.
End tag “br”.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
The first occurrence of ID “login_btn” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “menu1” was here.
This document appears to be written in Russian. Consider adding “lang="ru"” (or variant) to the “html” start tag.
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