Rocketmath.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “xmlns:og” not allowed here.
Attribute “xmlns:fb” not allowed here.
Bad value “https:” for attribute “href” on element “link”: Expected a slash ("/").
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Start tag “a” seen but an element of the same type was already open.
Stray end tag “a”.
Attribute “type” not allowed on element “iframe” at this point.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
No “p” element in scope but a “p” end tag seen.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Text not allowed in element “iframe” in this context.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
The “contentinfo” role is unnecessary for element “footer”.
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