Fede.education 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.
An element with “role=menuitem” must be contained in, or owned by, an element with “role=menubar” or “role=menu”.
A slash was not immediately followed by “>”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “document"” not allowed on element “div” at this point.
Element “option” without attribute “label” must not be empty.
Attribute “option” not allowed on element “option” at this point.
End tag “div” seen, but there were open elements.
Unclosed element “form”.
Attribute “vamue” not allowed on element “button” at this point.
Stray end tag “form”.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
Attribute “document"” is not serializable as XML 1.0.
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