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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/marker-display-dynamic-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: ::marker is created dynamically properly</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="marker-color-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#marker-pseudo">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1538589">
<style>
li {
  color: green;
  font-size: 40px;
  list-style-type: square;
}
::marker {
  display: none;
}
.tweak::marker {
  display: initial;
}
</style>
<ol>
    <li><!-- The list marker should be a green square.--></li>
</ol>
<script>
  onload = function() {
    let li = document.querySelector("li");
    li.offsetTop;
    li.classList.add("tweak");
  }
</script>