Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
Bad value “auto” for attribute “height” on element “img”: Expected a digit but saw “a” instead.
No “p” element in scope but a “p” end tag seen.
Attribute “border” not allowed on element “input” at this point.
Bad value “auto” for attribute “height” on element “input”: Expected a digit but saw “a” instead.
No space between attributes.
Named character reference was not terminated by a semicolon. (Or “&” should have been escaped as “&”.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “main” role is unnecessary for element “main”.
The “complementary” role is unnecessary for element “aside”.
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The “border” attribute is obsolete.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.
The “contentinfo” role is unnecessary for element “footer”.
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