填写测试应用表格
// setp 7填写测试应用表格
element = driver.FindElement(By.XPath("//td[@id='firstinput']")).FindElement(By.TagName("input"));
element.SendKeys("test first");
element = driver.FindElement(By.XPath("/html/body/form/table[1]/tbody/tr/td[1]/table/tbody/tr/td/table/tbody/tr[2]/td/table/tbody/tr[2]/td[2]/input"));
element.SendKeys("test last");