Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Bad value “http://#” for attribute “href” on element “a”: Invalid host: empty host.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “br”.
Element “h4” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Attribute “width” not allowed on element “a” at this point.
Attribute “height” not allowed on element “a” at this point.
The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Bad value “true” for attribute “async” on element “script”.
Bad value “javascript” for attribute “lang” on element “script”: Subtags must not exceed 8 characters in length.
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