Jazzopen.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “de_DE” for attribute “lang” on element “html”: The language subtag “de_de” is not a valid language subtag.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “video-89ab9cef”.
Attribute “controlslist” not allowed on element “video” at this point.
Bad value “100%” for attribute “height” on element “video”: Expected a digit but saw “%” instead.
Bad value “100%” for attribute “width” on element “video”: Expected a digit but saw “%” instead.
Duplicate ID “video-abee99bb”.
Duplicate ID “video-1a259b26”.
Bad value “section” for attribute “role” on element “div”.
Attribute “target” not allowed on element “div” at this point.
Attribute “rel” not allowed on element “div” at this point.
Warnings:
The “main” role is unnecessary for element “main”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “video-89ab9cef” was here.
The first occurrence of ID “video-abee99bb” was here.
The first occurrence of ID “video-1a259b26” was here.
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