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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: ::marker is created dynamically properly</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="marker-color-ref.html">
<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>