Regextester.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
A document must not include more than one “meta” element with a “charset” attribute.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
End tag “li” seen, but there were open elements.
Unclosed element “div”.
Element “ul” not allowed as child of element “h5” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “action” on element “form”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
End tag for “body” seen, but there were unclosed elements.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Empty heading.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The “button” role is unnecessary for element “button”.
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