Please refer example site used in this blog LINK
public class appletTestingWebdriver { public static void main(String[] args) throws InterruptedException { WebDriver myTestDriver = new FirefoxDriver(); myTestDriver.manage().window().maximize(); myTestDriver.navigate().to("http://tinyurl.com/2v5pzuh"); Thread.sleep(5000L); JavascriptExecutor js = (JavascriptExecutor) myTestDriver; js.executeScript("document.jsap.setText(document.forms[0].txt1.value);"); } }