2.2.23 [HTML] Section 14.2, Adding style to HTML
V0089:
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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): 1. If any META declarations specify the "Content-Style-Type", the last one in the character stream determines the default style sheet language. 2. Otherwise, if any HTTP headers specify the "Content-Style-Type", the last one in the character stream determines the default style sheet language. 3. Otherwise, the default style sheet language is "text/css".
All Document Modes (All Versions)
Non-CSS style sheet declarations are ignored.