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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/open-blank-host.js"></script>
<script>
  promise_test(async () => {
    assert_implements("HTMLPortalElement" in self);
    var win = await openBlankPortalHost();
    var portal = win.document.createElement("portal");
    portal.src = new URL("resources/simple-portal.html", location.href)

    await new Promise((resolve, reject) => {
      portal.onload = resolve;
      win.document.body.appendChild(portal);
    });

    return portal.activate();
  });
</script>