code: public TouchActions singleTap(WebElement onElement) {
      if (touchScreen != null) {
        action.addAction(new SingleTapAction(touchScreen, (Locatable) onElement));
      }
      tick(touchPointer.createPointerDown(0));
      tick(touchPointer.createPointerUp(0));
      return this;
    }
docs: Allows the execution of single tap on the screen, analogous to click using a Mouse.
  
  @param onElement the {@link WebElement} on the screen.
  @return self