code: public PageSnapshot highlight(WebElement element) {
          try {
              highlight(element, Color.red, 3);
          } catch (RasterFormatException rfe) {
              throw new ElementOutsideViewportException(ELEMENT_OUT_OF_VIEWPORT_EX_MESSAGE, rfe);
          }
          return this;
      }
docs: Highlights WebElement within the page with Color.red
  and line width 3.
  
  @param element WebElement to be highlighted
  @return instance of type PageSnapshot