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Test Info:

<html class="e1">
<style>
.e1:first-letter {}
#e0:first-line {}
</style>
<script>
document.documentElement.id = "e0"
a = document.createElement("form")
document.documentElement.appendChild(a)
document.documentElement.appendChild(document.createTextNode("}"))
b = document.createElement('m')
document.documentElement.appendChild(b)
c = document.createElement('i')
b.scrollLeftMax
c.textContent = "\uDCFF"
c.lastChild.before(undefined, a)
</script>