Oxfordlearning.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “en_CA” for attribute “lang” on element “html”: The language subtag “en_ca” is not a valid language subtag.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Duplicate ID “header-languages”.
Stray end tag “hr”.
Element “option” without attribute “label” must not be empty.
Bad value “presentation” for attribute “role” on element “button”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The first occurrence of ID “header-languages” was here.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
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