Soneva.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Duplicate attribute “href”.
Bad value “http://%20#” for attribute “href” on element “a”: Invalid host: Illegal character in domain: space is not allowed.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
The element “label” must not appear as a descendant of the “button” element.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “button” role is unnecessary for element “button”.
The “main” role is unnecessary for element “main”.
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