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Test Info:

<!doctype html>
<style>
.tweak ::-moz-range-thumb:is(:hover) {
background: red;
}
</style>
<div>
<input type=range>
</div>
<script>
onload = function() {
document.querySelector("div").getBoundingClientRect();
document.querySelector("div").classList.add("tweak");
}
</script>