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<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<script>
let f = document.createElement("iframe");
f.src = "data:text/html,<iframe src='http://example.com' onload=\"parent.postMessage({status:'loaded', type: 'http'}, 'https://example.com')\" onerror=\"parent.postMessage({status:'blocked', type: 'http'}, 'https://example.com')\"></iframe>";
window.addEventListener("message", (event) => {
parent.postMessage(event.data, "http://mochi.test:8888");
// Only create second iframe once
if(event.data.type === "https") {
return;
}
let f2 = document.createElement("iframe");
f2.src = "data:text/html,<iframe src='https://example.com' onload=\"parent.postMessage({status:'loaded', type: 'https'}, 'https://example.com')\" onerror=\"parent.postMessage({status:'blocked', type: 'https'}, 'https://example.com')\"></iframe>";
document.body.appendChild(f2);
});
document.body.appendChild(f);
</script>
</body>
</html>