Noble.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “async” not allowed on element “meta” at this point.
Bad value “navigation” for attribute “role” on element “ul”.
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 “width” on element “iframe”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “iframe”: The empty string is not a valid non-negative integer.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “h1” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “h3” in this context. (Suppressing further errors from this subtree.)
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Empty heading.
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