File: file_browser.test.onMessage.html

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<!doctype html>
<meta charset="utf-8">

Testing browser.test.onMessage event from
a page hosted on web-platform.test.

<script>
"use strict";

function send(detail) {
  dispatchEvent(new CustomEvent("testMsg", { detail }));
}

function listener(message, data) {
  send({ message, data });
}

window.subscribe = () => {
  if (!window.browser) {
    send({ error: "Missing browser namespace." });
    return;
  }
  if (!window.browser.test?.onMessage?.addListener) {
    send({ error: "Missing browser.test.onMessage.addListener." });
    return;
  }
  browser.test.onMessage.addListener(listener);

  // If other things don't resolve collection of messages, explicit timeout.
  setTimeout(() => send({ error: "timeout" }), 5_000);
}

window.unsubscribe = () => {
  browser.test.onMessage.removeListener(listener);
  send({ done: "unsubscribed" });
}

</script>