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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/contain-paint-049.html 

<!DOCTYPE html>
<meta charset="utf8">
<title>CSS Containment Test: Scrolling overflow works when paint is contained"</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-paint">
<meta name="assert" content="Scrolling overflow works when paint is contained.">

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

<style>
#container {
  width: 100px;
  height: 100px;
  overflow: auto;
  contain: paint;
}
.content {
  position: absolute;
  height: 500%;
  width: 100%;
}
</style>

<div id="container">
  <div class="content">
  </div>
</div>

<script>
  test(() => {
    container.scrollTo(0, 100);
    assert_equals(container.scrollTop, 100);
  }, "Scrolling overflow works when paint is contained");
</script>