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<!DOCTYPE html>
<body>
<script>
var portal1 = document.createElement("portal");
portal1.src = "simple-portal.html"
var portal2 = document.createElement("portal");
portal2.src = "simple-portal.html"
var waitForPortalToLoad = portal => new Promise((resolve, reject) => {
portal.onload = resolve;
});
Promise.all([waitForPortalToLoad(portal1),
waitForPortalToLoad(portal2)]).then(() => {
portal1.activate();
portal2.activate().catch(e => window.opener.postMessage(e.name, "*"));
});
document.body.append(portal1);
document.body.append(portal2);
</script>
</body>
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