HighlightElement.cs

       /// <summary>
        /// Highlight an element for a time 
        /// Useful in debugging/demos
        /// </summary>
        /// <param name="element">the element to highlight</param>
        /// <param name="time">time to highlight before returning to normal</param>
        public static void HighlightElement(IWebElement element, int highlightTimeMilliseconds = 5000)
        {
            IJavaScriptExecutor js = TestRunner.Driver as IJavaScriptExecutor;
            String oldStyle = element.GetAttribute("style");
            String args = "arguments[0].setAttribute('style', arguments[1]);";
            js.ExecuteScript(args, element, "border: 4px solid yellow;display:block;");
            Thread.Sleep(highlightTimeMilliseconds);
            js.ExecuteScript(args, element, oldStyle);

        }