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<!DOCTYPE html>
<body>
<script>
var portal = document.createElement("portal");
portal.src = "simple-portal.html";
document.body.appendChild(portal);
portal.onload = () => {
portal.activate();
error = "";
try {
portal.postMessage("message");
} catch (err) {
error = err.name;
}
bc = new BroadcastChannel("portals-post-message-during-activate");
bc.postMessage(error);
bc.close();
}
</script>
</body>