File: broadcastchannel-iframe.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>A test page that messes with a given SharedArrayBuffer sent from a BroadcastChannel</title>

<script>
"use strict";
const query = new URLSearchParams(location.search);
const channel = new BroadcastChannel(query.get("channel"));
const i = Number(query.get("index"));

channel.onmessage = e => {
  const sab = e.data.sab;
  if (sab === undefined) {
    // We only care about "broadcasts" from the window
    return;
  }

  const view = new Uint8Array(sab);
  view[i] = i + 1;
  channel.postMessage({ i });
};
</script>