Ttb.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”.
Attribute “runat” not allowed on element “img” at this point.
Attribute “displaymode” not allowed on element “img” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “runat” not allowed on element “a” at this point.
The “acronym” element is obsolete. Use the “abbr” element instead.
Stray start tag “script”.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
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