nl_tokens: Save visible viewport boundary to viewportXXX variables
pl_tokens: function calcViewport ( ) { var scrollTop = $window . scrollTop ( ) , scrollLeft = window . pageXOffset || 0 , edgeX = options . edgeX , edgeY = options . edgeY ; viewportTop = scrollTop - edgeY ; viewportBottom = scrollTop + ( window . innerHeight || $window . height ( ) ) + edgeY ; viewportLeft = scrollLeft - edgeX ; viewportRight = scrollLeft + ( window . innerWidth || $window . <mask> ( ) ) + edgeX ; }