As you know, selenium interacts with browsers, and this get method will receive information related only to browsers. As explained in another answer, the screen resolution and browser are very clear. Below a simple example, it is very clearly stated that webdriver only gets browser sizes.
WebDriver driver=new FirefoxDriver();
driver.get("http://www.google.com");
System.out.println(driver.manage().window().getSize());
driver.manage().window().maximize();
System.out.println(driver.manage().window().getSize());
Thanks Murali
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