Tissot.ch W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “en-EN” for attribute “lang” on element “html”: Bad region 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”.
Bad value “en-en” for attribute “hreflang” on element “link”: Bad region subtag.
Element “input” with attribute “type” whose value is “button” must have non-empty attribute “value”.
The element “input” must not appear as a descendant of the “a” element.
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
Consider avoiding viewport values that prevent users from resizing documents.
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