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<body></body> <title>a page with an iframe</title> <!-- This page makes an iframe to |subframe_url|.--> <script> const url_params = new URLSearchParams(location.search); let subframe_url = url_params.get("subframe_url"); if (subframe_url != null) { let iframe = document.createElement('iframe'); iframe.src = subframe_url; iframe.name = "subframe_name"; document.body.appendChild(iframe); } </script>