auto-expand-details-on-summary.html

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div style="height:2000px"></div>

<details id=detailselement>
  <summary>summary</summary>
  details
</details>

<script>
async_test(t => {
  assert_false(detailselement.open, `details should be closed at the start of the test.`);

  detailselement.addEventListener('toggle',
    t.unreached_func(`The details element shouldn't be toggled opened when the target text is in the summary.`));

  testRunner.findString('summary', ['Async']);

  requestAnimationFrame(t.step_func(() => {
    requestAnimationFrame(t.step_func(() => {
      requestAnimationFrame(t.step_func_done(() => {
        assert_false(detailselement.open, `The details shouldn't be open at the end of the test.`);
      }));
    }));
  }));
}, `Verifies that find-in-page does not expands details elements when the target text is inside of their already visible summary.`);
</script>

chromium/third_party/blink/web_tests/editing/text-iterator/auto-expand-details-on-summary.html