Errors:
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “a” is missing one or more of the following attributes: “role”.
Element “center” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
The “big” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “li” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
Attribute “;” not allowed on element “span” at this point.
End tag “big” violates nesting rules.
Stray end tag “span”.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “navigation” role is unnecessary for element “nav”.
Attribute “;” is not serializable as XML 1.0.
The “contentinfo” role is unnecessary for element “footer”.
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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