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Test Info:

<html class="reftest-wait">
<script>
a = document.createElement("style")
a.appendChild(document.createTextNode("*:first-letter { }"))
document.documentElement.appendChild(a)
a.style.display = "contents"
setTimeout(() => {
a.appendChild(document.createElement("x"));
a.lastChild.offsetWidth;
document.documentElement.className = "";
}, 0)
</script>
</html>