How to locate Object through ID

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<form name="loginForm">Login   Username: <input id="username" type="text" name="login" />   Password: <input id="password" type="password" name="password" />   <input type="submit" name="signin" value="SignIn" /></form> 1 2 3 WebElement elementUsername = driver.findElement(By.id("username"));   WebElement elementPassword = driver.findElement(By.id("password"));