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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
promise_test(async () => {
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>
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