LayoutTests/fast/css/match-result-cache-with-fast-path-inheritance.html

<style>
.hidden { visibility: hidden }
.square { width: 100px; height: 100px; }
</style>
<div id=c class=hidden>
    <div id=t class=square></div>
</div>
<script>
// Save to match result cache.
t.style.backgroundColor = "red";
document.body.offsetLeft;
// Trigger fast-path inheritance.
c.classList.remove("hidden");
document.body.offsetLeft;
// Retrieve from match result cache.
t.style.backgroundColor = "green";
</script>