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<!DOCTYPE html>
<meta charset="utf-8">
<iframe id="id_0"></iframe>
<script>
window.addEventListener("load", () => {
const iframe = document.getElementById("id_0")
// Discards the previous document
document.documentElement.appendChild(iframe)
const xhr = new XMLHttpRequest()
// LockManager is created after discarding
// At this point the new document is not there yet
iframe.contentWindow.navigator.locks.request("weblock_0", () => {
xhr.open("GET", "FOOBAR", false)
xhr.send()
// Now there is a new document
})
})
</script>
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