file_hwconcurrency_blob_iframer.html

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title></title>

<script src="shared_test_funcs.js"></script>

<script>

async function runTheTest(iframe_domain, cross_origin_domain) {

  const iframes = document.querySelectorAll("iframe");

  iframes[0].src = `https://${iframe_domain}/browser/browser/components/resistfingerprinting/test/browser/file_hwconcurrency_blob_iframee.html`;

  await waitForMessage("ready", `https://${iframe_domain}`);

  const promiseForRFPTest = new Promise(resolve => {

    window.addEventListener("message", event => {

      if(event.origin != `https://${iframe_domain}`) {

        throw new Error(`origin should be ${iframe_domain}`);

      resolve(event.data);

    }, { once: true });

});

  iframes[0].contentWindow.postMessage(["gimme", cross_origin_domain], "*");

  var result = await promiseForRFPTest;

  return result;

</script>

</head>

<body>

<iframe width=100></iframe>

</body>

</html>