layout/style/crashtests/1639533.html


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<!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>