portals-activate-inside-portal.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /portals/portals-activate-inside-portal.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<body>

  <script>

    promise_test(async () => {

      assert_implements("HTMLPortalElement" in self);

      var portal = document.createElement("portal");

      portal.src = "resources/portal-activate-inside-portal.html";

      let waitForMessage = new Promise((resolve, reject) => {

        portal.onmessage = e => resolve(e.data);

        document.body.appendChild(portal);

});

      var error = await waitForMessage;

      assert_equals(error, "InvalidStateError");

    }, "activating a nested portal should throw an error");

  </script>

</body>