Manualmachine.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Obsolete 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 “Cache-Control” for attribute “http-equiv” on element “meta”.
Bad value “PRAGMA” for attribute “http-equiv” on element “meta”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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