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

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

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

<details>
  <div style="height:2000px"></div>
  <div id=target>target</div>
</details>

<script>
async_test(t => {
  const details = document.querySelector('details');
  details.addEventListener('toggle', t.step_func_done(() => {
    assert_true((window.innerHeight + window.scrollY) >= document.body.offsetHeight);
  }));

  testRunner.findString('target', ['Async']);
}, `Verifies that find-in-page scrolls the target all the way into view when auto expanding details elements.`);
</script>