Bookcreator.com 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.
No “p” element in scope but a “p” end tag seen.
Bad value “Buttons-/-Social-Share-/-Facebook-Hover-or-Tapped” for attribute “id” on element “g”: Not a valid XML 1.0 name.
Duplicate ID “linearGradient-1”.
Duplicate ID “Symbols”.
Duplicate ID “Buttons-/-Social-Share-/-Facebook-Hover-or-Tapped”.
Duplicate ID “Brand-Bar”.
Warnings:
The “banner” role is unnecessary for element “header”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “linearGradient-1” was here.
The first occurrence of ID “Symbols” was here.
The first occurrence of ID “Buttons-/-Social-Share-/-Facebook-Hover-or-Tapped” was here.
The first occurrence of ID “Brand-Bar” 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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