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chromium/third_party/blink/web_tests/editing/text-iterator/find-no-smooth-scroll.html 

<!DOCTYPE html>
<html style="scroll-behavior:smooth">
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=866694">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

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

<script>
promise_test(async () => {
  assert_equals(window.pageYOffset, 0,
    'The page should initially be scrolled to the top at the start of the test.');

  testRunner.findString('hello world', ['Async']);
  await new Promise(requestAnimationFrame);

  const finalScrollOffset = window.pageYOffset;
  assert_not_equals(finalScrollOffset, 0,
    'The page should start scrolling after one rAF.');
  await new Promise(requestAnimationFrame);

  assert_equals(window.pageYOffset, finalScrollOffset,
    'The scrolling should be done after one rAF.');
}, 'find-in-page should not do smooth scrolling even if the page has the property set.');
</script>