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Add test11.html postMessage demo #33

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23 changes: 23 additions & 0 deletions test11.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>PostMessage Demo</title>
</head>
<body>
<h1>PostMessage Receiver</h1>
<p id="origin">Waiting for message...</p>
<div id="output"></div>

<script>
window.addEventListener('message', (event) => {
// Shows the origin but FAILS to validate it (critical bug)
document.getElementById('origin').textContent = 'Last message origin: ' + event.origin;

// Dangerous sink: direct innerHTML assignment of untrusted data
const incoming = typeof event.data === 'string' ? event.data : JSON.stringify(event.data);
document.getElementById('output').innerHTML = incoming;
});
</script>
</body>
</html>