Errors:
The “scheme” attribute on the “meta” element is obsolete. Use only one scheme per field, or make the scheme declaration part of the value.
No space between attributes.
Attribute “host-env” not allowed on element “div” at this point.
Bad value “27px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “24px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
End tag “svg” did not match the name of the current open element (“symbol”).
Attribute “doc-view” not allowed on element “section” at this point.
Bad value “{0}” for attribute “href” on element “a”: Illegal character in path segment: “{” is not allowed.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “region” role is unnecessary for element “section”.
Empty heading.
Attribute “aria-hidden” is unnecessary for elements that have attribute “hidden”.
The “contentinfo” role is unnecessary for element “footer”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
This document appears to be written in English but the “html” start tag has an empty “lang” attribute. Consider using “lang="en"” (or variant) instead.
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).
United States US