Test of what variations on the @charset directive are acceptable

@charset "utf-8";    noyes
@CHARSET "utf-8";    noyes
@ChArSeT "utf-8";    noyes
@cHaRsEt "utf-8";    noyes

@charset"utf-8";     noyes
@charset  "utf-8";   noyes
@charset\9"utf-8";   noyes
@charset\A"utf-8";   noyes
@charset\C"utf-8";   noyes
@charset\D"utf-8";   noyes
@charset "utf-8" ;   noyes
 @charset "utf-8";   noyes

@charset 'utf-8';    noyes