Experimental Proposals

The following @-rules have been proposed but not been widely supported by browsers (as of 11 Jun 2020).

Printing:
   @top-center
   @right-bottom
   @left-bottom
   @bottom-center

Font:
   @font-feature-values
         @swash
         @ornaments
         @annotation
         @styleset
         @stylistic
         @character-variant

Counter-style:
   @counter-style

Others:
   @historical-forms
   @viewport