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chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-snap/capturing-snap-positions.html 

<!doctype html>
<meta charset=utf-8>
<title>scroll-snap-type on non-scrollers traps snap positions</title>
<link rel=author title="Tab Atkins-Bittner" href="https://www.xanthir.com/contact/">
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#captures-snap-positions">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>

.scroller {
  width: 100px;
  height: 100px;
  overflow: auto;
  scroll-snap-type: block mandatory;
}
.item {
  background: gray;
  height: 100px;
  scroll-snap-type: block mandatory;
}
.item.snapped {
  background: green;
  scroll-snap-align: center;
}
.subitem {
  background: red;
  height: 100px;
  scroll-snap-align: center;
}

</style>


<!--
Boxes with a non-none value for scroll-snap-type
will capture snap positions from their descendents,
preventing them from affecting higher-up scrollers,
even if they are not, themselves, scrollers.
-->

<div class=scroller>
  <div class=item></div>
  <div class=item><div class=subitem></div></div>
  <div class="item snapped"></div>
  <div class=item></div>
</div>

<script>

test(()=>{
  const el = document.querySelector('.scroller');
  assert_equals(el.scrollTop, 200);
}, "The third item should be snapped to by default, not the second's child.");

</script>