Keeping.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “” for attribute “href” on element “link”: Must be non-empty.
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 “wp-video-lightbox” for attribute “rel” on element “a”: The string “wp-video-lightbox” is not a registered keyword.
No “p” element in scope but a “p” end tag seen.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “installAddon”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “span”.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
Unclosed element “footer”.
Stray end tag “footer”.
Stray end tag “div”.
Stray end tag “script”.
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 “installAddon” was here.
The “contentinfo” role is unnecessary for element “footer”.
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