Browser Dimensions set to View port using Selenium Webdriver

The viewport is the user's visible area of a web page. The viewport varies with the device, and will be smaller on a mobile phone than on a computer screen. Before tablets and mobile phones, web pages were designed only for computer screens, and it was common for web pages to have a static design and a fixed size.

	package test.qaearth;
	import org.openqa.selenium.Dimension;
	import org.openqa.selenium.JavascriptExecutor;
	import org.openqa.selenium.Point;
	import org.openqa.selenium.WebDriver;
	import org.openqa.selenium.firefox.FirefoxDriver;
	public class ViewPortSize {
	public static void main(String args[]) {
	System.setProperty("webdriver.gecko.driver", "Drivers/geckodriver.exe");
	WebDriver driver = new FirefoxDriver();
	driver.manage().window().setPosition(new Point(0, 0));
	driver.manage().window().setSize(new Dimension(1280, 214));
	driver.get("http://viewportsizes.com/mine/");
	Dimension browserSize = driver.manage().window().getSize();
	Dimension actualViewportSize = getViewportSize(driver);
	driver.manage().window().setSize(new Dimension(2 * browserSize.width - actualViewportSize.getWidth(),
	2 * browserSize.height - actualViewportSize.getHeight()));
	driver.get("http://viewportsizes.com/mine/");
	// driver.close();
	}
	protected static Dimension getViewportSize(WebDriver driver) {
	int width = extractViewportWidth(driver);
	int height = extractViewportHeight(driver);
	return new Dimension(width, height);
	}
	protected static int extractViewportWidth(WebDriver driver) {
	JavascriptExecutor js = (JavascriptExecutor) driver;
	int viewportWidth = Integer.parseInt(js.executeScript(JS_GET_VIEWPORT_WIDTH, new Object[0]).toString());
	return viewportWidth;
	}
	protected static int extractViewportHeight(WebDriver driver) {
	JavascriptExecutor js = (JavascriptExecutor) driver;
	int result = Integer.parseInt(js.executeScript(JS_GET_VIEWPORT_HEIGHT, new Object[0]).toString());
	return result;
	}
	private static final String JS_GET_VIEWPORT_WIDTH = "var width = undefined; if (window.innerWidth) {width = window.innerWidth;} else if (document.documentElement && document.documentElement.clientWidth) {width = document.documentElement.clientWidth;} else { var b = document.getElementsByTagName('body')[0]; if (b.clientWidth) {width = b.clientWidth;}};return width;";
	private static final String JS_GET_VIEWPORT_HEIGHT = "var height = undefined; if (window.innerHeight) {height = window.innerHeight;} else if (document.documentElement && document.documentElement.clientHeight) {height = document.documentElement.clientHeight;} else { var b = document.getElementsByTagName('body')[0]; if (b.clientHeight) {height = b.clientHeight;}};return height;";
	}

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