Toledomuseum.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “menu” for attribute “role” on element “nav”.
Attribute “about” not allowed on element “article” at this point.
Attribute “about” not allowed on element “div” at this point.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “article” role is unnecessary for element “article”.
The “form” role is unnecessary for element “form”.
The “textbox” role is unnecessary for an “input” element that has no “list” attribute and whose type is “text”.
Empty heading.
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