How to highlight elements in Selenium Webdriver

How to highlight elements in Selenium Webdriver:
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We can highlight the elements in Selenium Webdriver by taking support of JavascriptExecutor interface.
This interface is having one method called executeScript(--),by usiu=ng this method we can highlate the elements when the action is performing


//sample example
----------------------
package files;

import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class HighLateDemo {

public static void main(String []args) throws InterruptedException{
 
 WebDriver driver=new FirefoxDriver();
 
 driver.manage().window().maximize();
 
 driver.get("http://www.gmail.com");
 
 JavascriptExecutor js=(JavascriptExecutor)driver; 
 
 WebElement username= driver.findElement(By.id("Email"));  

 js.executeScript("arguments[0].style.border='4px groove green'", username);
 
 username.sendKeys("rameshat914@gmail.com");
 
 WebElement next = driver.findElement(By.id("next"));
 
 js.executeScript("arguments[0].style.border='4px groove green'", next);
 
 next.click();
 
 Thread.sleep(3000);
 
 WebElement password = driver.findElement(By.id("Passwd"));
 
 js.executeScript("arguments[0].style.border='4px groove green'", password);
 
 password.clear();
 
 password.sendKeys("selenium");
 
 WebElement signin = driver.findElement(By.id("signIn"));
 
 js.executeScript("arguments[0].style.border='4px groove green'", signin);
 
 signin.click();
 
 driver.quit();
 
}

}