Tmdn.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “style” not allowed as child of element “li” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Duplicate attribute “title”.
Bad value “tooltip” for attribute “rel” on element “a”: The string “tooltip” is not a registered keyword.
Attribute “alt” not allowed on element “a” at this point.
Bad value “true” for attribute “async” on element “script”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Stray start tag “script”.
Greece GR