JAVA

設定為最大瀏覽器視窗大小：

//Initialize Browser
System.setProperty("webdriver.gecko.driver", "E:\\path\\to\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
driver.get("https://www.google.com/");

//Set Browser window size
driver.manage().window().maximize();

設定特定視窗大小：

//Initialize Browser
System.setProperty("webdriver.gecko.driver", "E:\\path\\to\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
driver.get("https://www.google.com/");

//Initialize Dimension class object and set Browser window size
org.openqa.selenium.Dimension d = new org.openqa.selenium.Dimension(400, 500);
driver.manage().window().setSize(d);

獲取瀏覽器視窗大小：

//Initialize Browser
System.setProperty("webdriver.gecko.driver", "E:\\path\\to\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
driver.get("https://www.google.com/");

//Get Browser window size and print on console
System.out.println(driver.manage().window().getSize());