message: Replaced rgba with transparent
diff: @@ -50,5 +50,5 @@ function disableSelection(canvas: HTMLCanvasElement): void {
  // tslint:disable-next-line:no-any
  (canvas as any).style.MozUserSelect = 'none';
  - canvas.style.webkitTapHighlightColor = 'rgba(0,0,0,0)';
  + canvas.style.webkitTapHighlightColor = 'transparent';
  }
  