Thinkprogress.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Duplicate ID “Page-1”.
Duplicate ID “close-button”.
Duplicate ID “Shape”.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Element “img” is missing required attribute “src”.
Duplicate ID “post-list-sidebar”.
Bad value “generator nofollow” for attribute “rel” on element “a”: The string “generator” is not a registered keyword.
Warnings:
The “banner” role is unnecessary for element “header”.
The first occurrence of ID “Page-1” was here.
The first occurrence of ID “close-button” was here.
The first occurrence of ID “Shape” was here.
The “main” role is unnecessary for element “main”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “post-list-sidebar” was here.
The “contentinfo” role is unnecessary for element “footer”.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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