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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
  test(() => {
    let portal = document.createElement("portal");
    let xmlDoc = document.implementation.createDocument("", null);
    xmlDoc.appendChild(portal);
  }, "inserting a portal element into an XML document shouldn't crash or throw");

  test(() => {
    let iframe = document.createElement("iframe");
    document.body.appendChild(iframe);
    let doc = iframe.contentDocument;
    iframe.remove();
    let portal = document.createElement("portal");
    doc.body.appendChild(portal);
  }, "inserting a portal element into a detached iframe's document shouldn't crash or throw");
</script>
</body>