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>