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).
Bad start tag in “img” in “head”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “noscript”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
No “p” element in scope but a “p” end tag seen.
Duplicate ID “map”.
The “id” attribute on a “map” element must have an the same value as the “name” attribute.
The “center” element is obsolete. Use CSS instead.
No “li” element in scope but a “li” end tag seen.
Duplicate ID “leftnav”.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “map” was here.
The first occurrence of ID “leftnav” was here.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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