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<html>
<body>
<iframe id="testframe"></iframe>
<script type="application/javascript">
// simply passing on the message from the child to parent
window.addEventListener("message", receiveMessage);
function receiveMessage(event) {
window.removeEventListener("message", receiveMessage);
window.parent.postMessage({result: event.data.result}, '*');
}
const NESTED_IFRAME_NAVIGATION = `
<html>
<body>
<script type="application/javascript">
let link = document.getElementById("testlink");
link.click();
<\/script>
</body>
</html>`;
let NESTED_BLOB_IFRAME_NAVIGATION = new Blob([NESTED_IFRAME_NAVIGATION], {type:'text/html'});
// query the testframe and set blob URL
let testframe = document.getElementById("testframe");
testframe.src = window.URL.createObjectURL(NESTED_BLOB_IFRAME_NAVIGATION);
</script>
</body>
</html>