zoom in using selenium java code example

Example: how to perform zoom in selenium java

package stm;
import org.openqa.selenium.By;
import org.openqa.selenium.Keys;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.Test;
public class zoomInZoomOut {
	@Test
	public void googleSearchTest() throws InterruptedException{
		System.setProperty("webdriver.gecko.driver", System.getProperty("user.dir")+"\\src\\test\\java\\drivers\\geckodriver.exe");
		WebDriver driver = new FirefoxDriver();
		driver.get("https://www.softwaretestingmaterial.com");
		driver.manage().window().maximize();
		Thread.sleep(5000);
		System.out.println("zooming");
		// To zoom in 3 times
		for(int i=0; i<3; i++){ 
			driver.findElement(By.tagName("html")).sendKeys(Keys.chord(Keys.CONTROL,Keys.ADD));
		}
		// To zoom out 3 times
		for(int i=0; i<3; i++){
			driver.findElement(By.tagName("html")).sendKeys(Keys.chord(Keys.CONTROL,Keys.SUBTRACT));
		}
		//To set the browser to default zoom level ie., 100%
		driver.findElement(By.tagName("html")).sendKeys(Keys.chord(Keys.CONTROL, "0"));
	}
}