Errors:
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Attribute “x” not allowed on element “symbol” at this point.
Attribute “y” not allowed on element “symbol” at this point.
Attribute “width” not allowed on element “symbol” at this point.
Attribute “height” not allowed on element “symbol” at this point.
Attribute “with” not allowed on element “symbol” at this point.
End tag “svg” did not match the name of the current open element (“symbol”).
Stray end tag “symbol”.
Stray end tag “defs”.
Stray end tag “svg”.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “ul” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Attribute “hreflang” not allowed on element “li” at this point.
Attribute “novalidate” not allowed on element “div” at this point.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “article” role is unnecessary for element “article”.
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).
The “contentinfo” role is unnecessary for element “footer”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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