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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<iframe id="nestframe"></iframe>
<script>
let nestframe = document.getElementById("nestframe");
window.addEventListener("message", (event) => {
parent.postMessage(event.data, "*");
// Only create second iframe once
if(event.data.type === "https") {
return;
}
nestframe.contentDocument.body.innerHTML = `
<iframe id="frametwo"
src=\"https://example.com\"
onload=\"parent.postMessage({status:'loaded', type: 'https'}, '*')\"
onerror=\"parent.postMessage({status:'blocked', type: 'https'}, '*')\"
></iframe>`;
});
nestframe.onload = (event) => {
nestframe.contentDocument.body.innerHTML = `
<iframe id="frameone"
src=\"http://example.com\"
onload=\"parent.postMessage({status:'loaded', type: 'http'}, '*')\"
onerror=\"parent.postMessage({status:'blocked', type: 'http'}, '*')\"
></iframe>`;
}
nestframe.src = "about:blank";
</script>
</body>
</html>
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