This is a testharness.js-based test.
[FAIL] Removing steps (innerHTML): script does not run synchronously during iframe destruction
  assert_false: iframe1 pagehide did not fire expected false got true
[FAIL] Removing steps (replaceChildren): script does not run synchronously during iframe destruction
  assert_false: iframe1 pagehide did not fire expected false got true
[FAIL] Removing steps (remove): script does not run synchronously during iframe destruction
  assert_false: iframe1 pagehide did not fire expected false got true
Harness: the test ran to completion.