nl_tokens: updates the internal vW property with the current viewport width in px
pl_tokens: function updateMetrics ( ) { isVwDirty = false ; DPR = <mask> . devicePixelRatio ; cssCache = { } ; sizeLengthCache = { } ; pf . DPR = DPR || 1 ; units . width = Math . max ( window . innerWidth || 0 , docElem . clientWidth ) ; units . height = Math . max ( window . innerHeight || 0 , docElem . clientHeight ) ; units . vw = units . width / 100 ; units . vh = units . height / 100 ; evalId = [ units . height , units . width , DPR ] . join ( "-" ) ; units . em = pf . getEmValue ( ) ; units . rem = units . em ; }