Show how to add elements into a page with Selenium using JavascriptExecutor and executeScript

AddElementToPage.java

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;

public class AddElementToPage
{
	public static void main(String[] args)
	{
		String code =
			"body = document.querySelector('body');" +
			"element = document.createElement('div');" +
			"text = document.createTextNode('Hello');" +
			"element.appendChild(text);" +
			"body.append(element);";

		WebDriver driver = new ChromeDriver(); // or FirefoxDriver or RemoteWebDriver, etc.

		String url = "about:blank"; // or whatever page you want to go to
		driver.get(url);
		
		JavascriptExecutor js = (JavascriptExecutor) driver;
		js.executeScript(code);
	}
}