Royalacademy.org.uk W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
No “li” element in scope but a “li” end tag seen.
Element “p” not allowed as child of element “h3” in this context. (Suppressing further errors from this subtree.)
Element “span” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Stray end tag “img”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
The element “button” must not appear as a descendant of the “a” element.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The element “iframe” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “h4” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
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