function msPointerDown(inEvent) {
  this.pointerMap[inEvent.pointerId.toString()] = inEvent;
  const e = this.prepareEvent_(inEvent);
  this.dispatcher.down(e, inEvent);
}
function msPointerDown(inEvent) {
  this.pointerMap[inEvent.pointerId.toString()] = inEvent;
  const e = this.prepareEvent_(inEvent);
  this.dispatcher.down(e, inEvent);
}
function msPointerDown ( inEvent ) { this . pointerMap [ inEvent . pointerId . toString ( ) ] = inEvent ; const e = this . prepareEvent_ ( inEvent ) ; this . dispatcher . down ( e , inEvent ) ; }
Handler for `msPointerDown`.

@this {MsSource}
@param {MSPointerEvent} inEvent The in event.
Handler for msPointerDown .
Handler for msPointerDown.