Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Obsolete doctype. Expected “<!DOCTYPE html>”.
Attribute “xmlns:og” not allowed here.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
Attribute “xml:twitter” not allowed on element “html” at this point.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
Bad value “application/xhtml+xml; charset=utf-8” for attribute “content” on element “meta”: The legacy encoding declaration did not start with “text/html;”.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
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 “related” for attribute “rel” on element “link”: The string “related” is not a registered keyword.
Bad value “http://opds-spec.org/shelf” for attribute “rel” on element “link”: The string “http://opds-spec.org/shelf” is not a registered keyword.
Bad value “screen, projection” for attribute “media” on element “link”: Deprecated media type “projection”. For guidance, see the Media Types section in the current Media Queries specification.
Bad value “nofollow http://opds-spec.org/acquisition/buy” for attribute “rel” on element “a”: The string “http://opds-spec.org/acquisition/buy” is not a registered keyword.
Warnings:
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
Attribute “xml:twitter” is not serializable as XML 1.0.
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