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Test Info:

<script>
document.addEventListener('DOMContentLoaded', function() {
var x = new ResizeObserver(function(a1, a2) { })
var a = document.createElementNS('http://www.w3.org/1999/xhtml', 'l')
x.observe(a, { })
x.disconnect()
x.observe(a, { })
})
</script>