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<style>
* { display: contents; }
</style>
<script>
a = document.createElement('map')
document.documentElement.appendChild(a)
a.appendChild(document.head)
document.documentElement.getBoundingClientRect()
document.designMode = "on"
document.designMode = "off"
a.appendChild(document.createElement('frame'))
document.designMode = "on"
</script>