Text drawn large, rotated and translucent across the centre of every page of a template, under the body.
public sealed class Watermark
ISO 32000-2 §14.8.2.2.2, Table 363: a pagination artifact with Subtype Watermark; the opacity is the
ca constant alpha of an ExtGState (§11.6.4.4).
kind:method, kind:property, kind:ctor. Press Esc to clear.Watermark(String, TextStyle)Creates a watermark of text in style.