21. Frame Switching & Nested iframe Automation

Switching into iframes

// Method 1: By WebElement (Recommended)
WebElement frameElement = driver.findElement(By.id("payment-frame"));
driver.switchTo().frame(frameElement);
// Interact inside the frame:
driver.findElement(By.id("card-number")).sendKeys("4242 4242 4242 4242");
// Always switch back to the main page:
driver.switchTo().defaultContent();
// Switching to parent frame from nested iframe:
driver.switchTo().parentFrame();