Correct: @charset "utf-8"; FAILPASS Wrong Capitalization: @CHARSET "utf-8"; PASSFAIL @ChArSeT "utf-8"; PASSFAIL @cHaRsEt "utf-8"; PASSFAIL Wrong Whitespace: @charset"utf-8"; PASSFAIL @charset "utf-8"; PASSFAIL @charset\9"utf-8"; PASSFAIL @charset\A"utf-8"; PASSFAIL @charset\C"utf-8"; PASSFAIL @charset\D"utf-8"; PASSFAIL @charset "utf-8" ; PASSFAIL @charset "utf-8"; PASSFAIL Wrong Quote character: @charset 'utf-8'; PASSFAIL @charset "utf-8'; PASSFAIL @charset 'utf-8"; PASSFAIL Wrong Semicolon: @charset "utf-8" PASSFAIL