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).
Internal encoding declaration “windows-1251” disagrees with the actual encoding of the document (“utf-8”).
A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Attribute “rel” not allowed on element “div” at this point.
The “center” element is obsolete. Use CSS instead.
Element “noindex” not allowed as child of element “center” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
No “p” element in scope but a “p” end tag seen.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
The “scrolling” attribute on the “iframe” element is obsolete.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The “frameborder” attribute on the “iframe” element is obsolete.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The “allowtransparency” attribute on the “iframe” element is obsolete.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.
Stray “/” at the end of an end tag.
Attribute “alt” not allowed on element “a” at this point.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Empty heading.
Attribute “;” is not serializable as XML 1.0.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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