19. Multi-Tab & Multi-Window Switching via Window Handles

Window Handle Management

String parentWindow = driver.getWindowHandle();
// Click button that opens child tab:
driver.findElement(By.id("open-tab-btn")).click();
// Switch to new tab:
Set<String> allWindows = driver.getWindowHandles();
for (String handle : allWindows) {
    if (!handle.equals(parentWindow)) {
        driver.switchTo().window(handle);
        break;
    }
}
// Perform actions in child tab, then close and return:
driver.close();
driver.switchTo().window(parentWindow);