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Test Info: Warnings

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
promise_test(() => {
assert_implements("HTMLPortalElement" in self);
var portal = document.createElement("portal");
portal.src = "resources/portals-nested-portal.html";
document.body.appendChild(portal);
var waitForMessage = new Promise((resolve, reject) => {
portal.onmessage = resolve;
});
return waitForMessage;
}, "nested portals shouldn't crash");
</script>
</body>