Function scaleToPageSize

scaleToPageSize(handlerId, size, margins?, units?): String
Instructs the given handler to zoom its content so that it would fit into a page of the given size. We currently know about LETTER, A5, A4, A3, A2, A1, A0 and FULL (which is the same as calling scaleToFullPage). Note that this method returns an array serialized as a string.
Parameters
- handlerId: string
  ID of the handler to scale.
- size: string
  PageSize to fit into.
- margins: Margins = ...
  Optional margins to use (in [top,right,bottom,left] format). Values here are expressed in whatever you specify for units, which defaults to CENTIMETERS if you leave it empty.
- units: string = "CENTIMETERS"
  Optional units, defaults to CENTIMETERS.
Returns String