Manage multiple windows by handle

Open a tab and a popup window, identify each by handle and title, and return to the main window.

1. 1Save the main handle, click #open-tab and then #open-window (the driver stays on the main window).
2. 2Wait for three handles, then switch to each one and record its title.
3. 3Assert the titles “Release notes | Help Center” and “Live chat | Help Center” are both present.
4. 4Switch to the Live chat window and assert #child-heading reads “Live chat”.
5. 5Switch back to the main handle, click #mark-read and assert #main-status reads “All caught up”.

• Handles are iterated and switched by value
• #main-status shows “All caught up” in the main window
• At least 3 assertions pass