File: scriptExecPage.html

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<html>
<head>
  <title>A content page for executing script!</title>
  <script type="text/javascript" src="https://example.com/browser/toolkit/components/resistfingerprinting/tests/browser/testHelpers.js"></script>
</head>
<body>
<h1>Here the content!</h1>
<script>

function info(msg) {
  window.postMessage({ type: "info", msg }, "*");
}

function ok(what, msg) {
  window.postMessage({ type: "ok", what: !!what, msg }, "*");
}

function is(a, b, msg) {
  ok(a === b, msg);
}

onmessage = async function(e) {
  if (!e.data.callback) {
    return;
  }
  let data = e.data.callback;
  let runnableStr = `(() => {return (${data});})();`;
  let runnable = eval(runnableStr); // eslint-disable-line no-eval

  await runnable.call(this, this, window);

  window.postMessage({ type: "finish" }, "*");
};

</script>
</body>
</html>