Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “http://www.google.com/bookmarks/mark?op=add&bkmk=http://www.greenhotelier.org/?p=10688&title=Talking Point: Why waste it?” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “_blank"” not allowed on element “a” at this point.
No “p” element in scope but a “p” end tag seen.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “container”.
Duplicate ID “sidebar”.
Bad value “https://t.c…” for attribute “href” on element “a”: Invalid host: A label or domain name contains disallowed characters..
Stray end tag “a”.
Warnings:
Attribute “_blank"” is not serializable as XML 1.0.
The first occurrence of ID “container” was here.
The first occurrence of ID “sidebar” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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