Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “imagetoolbar” for attribute “http-equiv” on element “meta”.
The “language” attribute on the “script” element is obsolete. Use the “type” attribute instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “l”.
Duplicate ID “r”.
Element “li” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “src” on element “img”: Must be non-empty.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
No “li” element in scope but a “li” end tag seen.
Attribute “value” not allowed on element “input” at this point.
Element “input” is missing required attribute “alt”.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Warnings:
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The first occurrence of ID “l” was here.
The first occurrence of ID “r” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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