Youtube.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Content-Security-Policy HTTP header: Bad content security policy: Unrecognised directive-name: "require-trusted-types-for".
Attribute “darker-dark-theme” not allowed on element “html” at this point.
Attribute “darker-dark-theme-deprecate” not allowed on element “html” at this point.
Attribute “system-icons” not allowed on element “html” at this point.
Attribute “typography” not allowed on element “html” at this point.
Attribute “typography-spacing” not allowed on element “html” at this point.
Attribute “refresh” not allowed on element “html” at this point.
Bad value “origin-trial” for attribute “http-equiv” on element “meta”.
Bad value “handheld” for attribute “media” on element “link”: Deprecated media type “handheld”. For guidance, see the Media Types section in the current Media Queries specification.
Attribute “name” not allowed on element “script” at this point.
Attribute “autocorrect” not allowed on element “input” at this point.
Attribute “viewBox” not allowed on element “g” at this point.
Duplicate ID “youtube-paths”.
Attribute “name” not allowed on element “link” at this point.
Duplicate ID “menu”.
Warnings:
The first occurrence of ID “youtube-paths” was here.
The first occurrence of ID “menu” was here.
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