Relax-guide.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Legacy doctype. Expected “<!DOCTYPE html>”.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
Bad value “content-style-type” for attribute “http-equiv” on element “meta”.
Bad value “resource-type” for attribute “http-equiv” on element “meta”.
Warnings:
This document appears to be written in German. Consider adding “lang="de"” (or variant) to the “html” start tag.
Germany DE