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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
  <script>
    promise_test(async t => {
      assert_implements("HTMLPortalElement" in self);
      var iframe = document.createElement("iframe");
      iframe.src = "resources/portal-inside-iframe.html"
      var waitForLoad = new Promise((resolve, reject) => {
        iframe.onload = resolve;
      });
      document.body.appendChild(iframe);
      await waitForLoad;
      const portal = iframe.contentDocument.getElementById("portal");
      return promise_rejects_dom(t, "InvalidStateError",
                                 iframe.contentWindow.DOMException,
                                 portal.activate());
    }, "activating portal inside iframe should fail");
  </script>
</body>