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iframe.html
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<!DOCTYPE html>
<html>
<head>
<title>iframe</title>
<meta charset="utf-8" />
<script>
const trustedOrigins = ["http://localhost:5000"];
function onMsg(msg) {
if (!trustedOrigins.includes(msg.origin)) return;
console.log(`Message from main window`, msg);
parent.postMessage(
JSON.stringify({
message: "this should be delivered to main window"
})
);
}
// setInterval(x=>{
// parent.postMessage(
// JSON.stringify({
// message: "this should be delivered to main window"
// })
// );
// },1_000)
window.addEventListener("message", onMsg, false);
</script>
</head>
<body>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
<h1>Iframe body</h1>
</body>
</html>