iframe session history bug

  1. Click the link in the first frame, followed by in the second frame.
  2. Click and hold on the "back" button, and select the first history entry (2 entries in the past).

Expected

Both pages should navigate back, as-if the "back" button was pressed twice.

Actual

Only the second frame navigates back, as-if the "back" button was pressed once, however the session history state is updated correctly.