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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async (t) => {
assert_implements("HTMLPortalElement" in self);
let hostWindow = window.open();
assert_equals(hostWindow.location.href, "about:blank");
let portal = hostWindow.document.createElement("portal");
portal.src = "resources/simple-portal.html";
hostWindow.document.body.appendChild(portal);
await promise_rejects_dom(t, "InvalidStateError", hostWindow.DOMException, portal.activate());
}, "about:blank cannot host a portal");
</script>
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