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Test Info:

<script>
window.addEventListener('load', () => {
let a = document.createElementNS('http://www.w3.org/1999/xhtml', 'frame')
document.documentElement.appendChild(a)
let b = a.contentWindow.indexedDB
while (document.documentElement.lastElementChild) {
document.documentElement.removeChild(document.documentElement.lastElementChild)
}
b.open('', { })
})
</script>