file_xslt_outer.html

Enable keyboard shortcuts

<iframe allow="microphone https://example.org" id="ifr"></iframe>

<script>

window.addEventListener("message", ({ data }) => { opener.postMessage(data, "*") });

const file = (new URLSearchParams(location.search)).get("file");

const CROSS_ORIGIN = new URL(file, location.href);

CROSS_ORIGIN.hostname = "example.org";

CROSS_ORIGIN.port = null;

document.getElementById("ifr").src = CROSS_ORIGIN.href;

</script>