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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<h1>Site B</h1>
<button>AddIframe</button>
<iframe></iframe>
<script>
document.querySelector("button").addEventListener("click", function() {
var iframe = document.querySelector("iframe");
});
</script>
</body>
</html>