Fra.me W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “poster” not allowed on element “source” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Stray end tag “ul”.
Element “ul” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
End tag “div” seen, but there were open elements.
Unclosed element “ul”.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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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