navigation-api/scroll-behavior/after-transition-reject.html

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div style="height: 1000px; width: 1000px;"></div>
<div id="frag"></div>
<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));
  assert_equals(window.scrollY, 0);
  await navigation.navigate("#frag").finished;
  assert_not_equals(window.scrollY, 0);
  navigation.onnavigate =
      e => e.intercept({ handler: () => Promise.reject(),
                         scroll: "after-transition" });

  await promise_rejects_exactly(t, undefined, navigation.back().finished);
  assert_not_equals(window.scrollY, 0);
}, "scroll: after-transition should not scroll when the intercept() handler rejects");
</script>
</body>