nl_tokens: x ... horizontal blur y ... vertical blur ( optional )
pl_tokens: function ( args ) { var x = _ . isFinite ( args . x ) ? args . x : 2 ; return _ . <mask> ( '<filter><feGaussianBlur stdDeviation="${stdDeviation}"/></filter>' , { stdDeviation : _ . isFinite ( args . y ) ? [ x , args . y ] : x } ) ; }