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Test Info:

<script>↩
window.onload = function() {↩
a.setAttribute("width", "0")↩
b.select()↩
document.documentElement.style.display="none"
document.documentElement.getBoundingClientRect()↩
document.documentElement.style.display=""
SpecialPowers.forceGC();↩
SpecialPowers.forceCC();↩
document.body.offsetTop;↩
}↩
</script>↩
<input id="b" type="number">↩
<iframe id="a" height="0">↩