nl_tokens: Tries various vendor prefixes and returns the first supported property .
pl_tokens: function vendor ( el , prop ) { var s = el . style , pp , i if ( s [ prop ] !== undefined ) return prop prop = prop . charAt ( 0 ) . toUpperCase ( ) + prop . slice ( 1 ) for ( i = 0 ; i < prefixes . length ; i ++ ) { pp = prefixes [ i ] + <mask> if ( s [ pp ] !== undefined ) return pp } }