2.1.34 [HTML] Section 14.2.1, Setting the default style sheet language
V0064:
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User agents should determine the default style sheet language for a document according to the following steps (highest to lowest priority):If any META declarations specify the "Content-Style-Type", the last one in the character stream determines the default style sheet language. Otherwise, if any HTTP headers specify the "Content-Style-Type", the last one in the character stream determines the default style sheet language. Otherwise, the default style sheet language is "text/css".
All Document Modes (All Versions)
META declarations and HTTP headers that specify "Content-Style-Type" are not supported.