File: iframe-append-2.https.html

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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>