File: iframe-append.https.html

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<!DOCTYPE html>
<html class="test-wait">
<meta charset="utf-8">
<iframe id="id_0"></iframe>
<script>
  /** @param {HTMLIFrameElement} iframe */
  function waitForLoad(iframe) {
    // iframe is initialized immediately on Chrome while it needs some time on Firefox
    if (iframe.contentDocument.readyState === "complete") {
      return;
    }
    return new Promise(r => iframe.onload = r);
  }

  const iframe = document.getElementById("id_0");
  iframe.contentWindow.navigator.locks.request("weblock_0", async () => {
    await waitForLoad(iframe);
    document.body.append(iframe); // discards the document and destroys locks
    document.documentElement.classList.remove("test-wait");
  });
</script>