code: public void hover(final By by) {
  		checkTopmostElement(by);
  		WebElement element = findElement(by);
  		new Actions(webDriver).moveToElement(element).perform();
  	}
docs: Delegates to {@link #findElement(By)} and then moves the mouse to the returned element
  using the {@link Actions} class.
  
  @param by
  the {@link By} used to locate the element