file_hwconcurrency_blobcrossorigin_iframee.html

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<!DOCTYPE html>

<meta charset="utf8">

<script type="text/javascript">

  var s = `<html><script>

    let result = {

      hardwareConcurrency : navigator.hardwareConcurrency

};

    window.parent.postMessage(result, "*");`;

  // eslint-disable-next-line

  s += `</` + `script></html>`;

  let b = new Blob([s], { type: "text/html" });

  let url = URL.createObjectURL(b);

  location.href = url;

</script>

<body>

<output id="result"></output>

</body>