Yellow-sub.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Duplicate attribute “prefix”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
No “p” element in scope but a “p” end tag seen.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “strike” element is obsolete. Use CSS instead.
The “center” element is obsolete. Use CSS instead.
Warnings:
Empty heading.
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