Dentist.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Bad value “en_US” for attribute “lang” on element “html”: The language subtag “en_us” is not a valid language subtag.
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 “tag” not allowed on element “img” at this point.
The element “label” must not appear as a descendant of the “a” element.
Attribute “width” not allowed on element “a” at this point.
Attribute “height” not allowed on element “a” at this point.
Bad value “300px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Duplicate attribute “class”.
End tag “h1” seen, but there were open elements.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “form” role is unnecessary for element “form”.
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