File: intercept-popstate.html

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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async t => {
  // Wait for after the load event so that the navigation doesn't get converted
  // into a replace navigation.
  await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
  history.replaceState({ state: "foo"}, "", "#replace");

  let onpopstate_fired = false;
  let last_state;
  window.onpopstate = e => {
    onpopstate_fired = true;
    last_state = e.state;
  }
  navigation.onnavigate = t.step_func(e => e.intercept());

  await navigation.navigate("#").finished;
  assert_true(navigation.canGoBack);

  await navigation.back().finished;
  assert_true(onpopstate_fired);
  assert_not_equals(last_state, null);
}, "event.intercept() should provide popstate with a valid state object");
</script>