intercept-same-document-history-back.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /navigation-api/navigate-event/intercept-same-document-history-back.html - WPT Dashboard Interop Dashboard

<!doctype html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

async_test(t => {

  let start_length = navigation.entries().length;

  let start_index = navigation.currentEntry.index;

  // Wait for after the load event so that the navigation doesn't get converted

  // into a replace navigation.

  window.onload = () => t.step_timeout(() => {

    let onnavigate_calls = 0;

    let onnavigatesuccess_calls = 0;

    navigation.onnavigate = e => {

      onnavigate_calls++;

      e.intercept();

    navigation.onnavigatesuccess = t.step_func(e => {

      onnavigatesuccess_calls++;

      if (onnavigatesuccess_calls == 3) {

        assert_equals(navigation.entries().length, start_length + 2);

        assert_equals(navigation.currentEntry.index, start_index + 1);

        assert_equals(onnavigate_calls, 3);

        history.back();

      } else if (onnavigatesuccess_calls == 4) {

        assert_equals(navigation.entries().length, start_length + 2);

        assert_equals(navigation.currentEntry.index, start_index);

        assert_equals(onnavigate_calls, 4);

        t.done();

});

    navigation.navigate("?foo").finished

      .then(t.step_func(() => navigation.navigate("?bar").finished))

      .then(t.step_func(() => {

        assert_equals(navigation.entries().length, start_length + 2);

        assert_equals(navigation.currentEntry.index, start_index + 2);

        assert_equals(onnavigate_calls, 2);

        history.back();

      }));

  }, 0);

}, "event.intercept() can intercept same-document history.back()");

</script>