Js获取页面伪元素的内容 C#

    public string Get_IwebElement_PseudoElementsContent_UseJS(IWebElement Element)
{
            IJavascriptExecutor js = driver as IJavascriptExecutor;
            string Property=js.Executescript("return window.getComputedStyle(arguments[0], ':after').getPropertyValue('content');", Element).ToString();
            return Property;
 }