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 “ImageToolbar” for attribute “http-equiv” on element “meta”.
Bad value “” for attribute “media” on element “style”: Media query ended prematurely.
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “ul”.
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “main"” not allowed on element “main” at this point.
Element “a” is missing one or more of the following attributes: “aria-checked”, “role”.
The “font” element is obsolete. Use CSS instead.
Warnings:
The “complementary” role is unnecessary for element “aside”.
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
Attribute “main"” is not serializable as XML 1.0.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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