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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<script>
window.onload = () => {
a = document.createElement("frameset")
document.documentElement.appendChild(a)
b = document.createElement("f")
b.setAttribute("class", "x")
a.appendChild(b)
c = document.createElement("t")
document.documentElement.appendChild(c)
d = document.createElement('m')
d.setAttribute("class", "x")
c.appendChild(d)
f = document.createElement('d')
d.appendChild(f)
g = document.createElement('n')
f.appendChild(g)
setTimeout(() => {
g.setAttribute("class", "")
sheet = document.createElement("style")
sheet.appendChild(document.createTextNode(".x:-moz-broken{"))
document.head.appendChild(sheet)
document.documentElement.className = "";
}, 500)
}
</script>