Realclearscience.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Duplicate attribute “name”.
Duplicate ID “searchBox”.
Bad value “0” for attribute “rel” on element “a”: The string “0” is not a registered keyword.
Bad value “1” for attribute “rel” on element “a”: The string “1” is not a registered keyword.
Bad value “2” for attribute “rel” on element “a”: The string “2” is not a registered keyword.
Duplicate ID “popular”.
Forbidden code point U+009d.
End tag “div” seen, but there were open elements.
Unclosed element “ul”.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Bogus comment.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “searchBox” was here.
The first occurrence of ID “popular” was here.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The document is not mappable to XML 1.0 due to a trailing hyphen 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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