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chromium/third_party/blink/web_tests/fast/css-grid-layout/grid-item-scroll-position.html 

<!DOCTYPE html>
<style>
#grid {
  display: grid;
  height: 300px;
}
#item {
  overflow: scroll;
  overflow-anchor: none;
}
#content {
  height: 800px;
}
</style>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div id="log"></div>

<div id="grid">
  <div id="item">
    <div id="content">AAA</div>
  </div>
</div>

<script>
onload = () => {
  var item = document.querySelector("#item");
  item.scrollTo(0, 200);
  document.querySelector("#content").innerHTML = "BBB";
  test(() => {
    assert_equals(item.scrollTop, 200);
  }, "Checks that scroll position is kept when grid item content is modified.");
};
</script>