Goodthingsguy.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “xmlns:fb” not allowed here.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “alt” not allowed on element “a” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
No “p” element in scope but a “p” end tag seen.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “h3” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Attribute “allow” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “fb-root”.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
The first occurrence of ID “fb-root” was here.
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