Quirk.biz W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
End tag “svg” did not match the name of the current open element (“g”).
Duplicate ID “node1”.
The “main” element must not appear as a descendant of the “section” element.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
Unsupported SVG version specified. This validator only supports SVG 1.1. The recommended way to suppress this warning is to remove the “version” attribute altogether.
The first occurrence of ID “node1” was here.
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).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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