OptionalautoOptionalcontenthow tall the content is; set it again with setContentHeight as the content changes
the viewport's height, or its largest height when autoHeight is on
OptionalkeyboardhandleKey scrolls by line, page and to the ends
Optionallinehow far an arrow key scrolls; 24 when omitted
OptionaloffsetOptionaltouchdragging the content scrolls it and it coasts on release (update(dt) drives the coasting)
a viewport as tall as the content, up to
height