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Test Info:

<html>
<head>
<script>
function start() {
o1 = document.createElement('u')
o2 = document.createElement('li')
o3 = document.createElement('style')
o2.textContent = '\nr'
o1.appendChild(o2)
document.documentElement.appendChild(o1)
o3.textContent = 'html { white-space: pre } :first-letter { float: left }'
document.documentElement.appendChild(o3)
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
</html>