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Test Info:

<html>
<head>
<script>
window.addEventListener('load', () => {
const element = document.createElementNS('', 't')
document.designMode = 'on'
const range = new Range()
range.selectNodeContents(element)
range.surroundContents(document.documentElement)
document.execCommand('insertHorizontalRule', false, null)
})
</script>
</head>
</html>