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V0030:
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Media type names are case-insensitive.
Quirks Mode and IE7 Mode (All Versions)
Media type names are case-sensitive.
V0031:
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@media and @import rules with unknown media types (that are nonetheless valid identifiers) are treated as if the unknown media types are not present. If an @media/@import rule contains a malformed media type (not an identifier) then the statement is invalid. Note: Media Queries supercedes this error handling.
Quirks Mode and IE7 Mode (All Versions)
The @import rule does not ignore unknown media types. In the case of an unknown media type, the @import rules fail.