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2.2.2 [CSS-Level2-2009] Section 4.1.5, At-rules


The specification states:

At-rules start with an at-keyword, an '@' character followed immediately by an 
identifier (for example, '@import', '@page'). 

Quirks Mode and IE7 Mode (All Versions)

At-rules that start with the at character (@) followed immediately by spaces, tabs, numbers, dashes, or other special characters are ignored and do not allow the actual keyword command to be executed.

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