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<!DOCTYPE html>
<body>
<a rel="ar"></a>
<script>
window.addEventListener("load", function () {
const a = document.querySelector("a");
const elementID = internals.elementIdentifier(a);
const pageID = internals.pageIdentifier(document);
const documentID = internals.documentIdentifier(document);
a.addEventListener("message", function (event) {
window.webkit.messageHandlers.testSystemPreview.postMessage({ message: "triggered", action: event.data });
});
const msg = { message: "loaded", elementID, pageID, documentID };
window.webkit.messageHandlers.testSystemPreview.postMessage(msg);
});
</script>
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