Theganggreen.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>”.
Attribute “xmlns:xsi” not allowed here.
Attribute “xmlns:og” not allowed here.
Attribute “xsi:schemalocation” not allowed on element “html” at this point.
Bad value “en_us” for attribute “lang” on element “html”: The language subtag “en_us” is not a valid language subtag.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
Bad value “expires” for attribute “http-equiv” on element “meta”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value for attribute “src” on element “iframe”: Illegal character in query: space is not allowed.
Warnings:
Attribute with the local name “xmlns:xsi” is not serializable as XML 1.0.
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
Attribute “xsi:schemalocation” is not serializable as XML 1.0.
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