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<!DOCTYPE html>
<body>
<portal src="simple-portal-adopts-and-activates-predecessor.html">
<script>
function activate() {
var portal = document.querySelector("portal");
portal.activate().then(() => document.body.removeChild(portal));
}
var count = 0;
window.onportalactivate = e => {
++count;
if (count == 1) {
e.adoptPredecessor().activate();
} else {
window.opener.postMessage("done", "*");
}
};
</script>
</body>
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