Historynewsnetwork.org W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Element name “gcse:searchbox-only” cannot be represented as XML 1.0.
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).
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Errors:
End tag “header” seen, but there were open elements.
Unclosed element “div”.
Bad element name “gcse:searchbox-only”: Code point “U+003A” is not allowed
Stray doctype.
Stray start tag “html”.
Start tag “body” seen but an element of the same type was already open.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “section”.
Stray end tag “div”.
Duplicate attribute “style”.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
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