file_hwconcurrency_blob_iframee.html

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<!DOCTYPE html>

<meta charset="utf8">

<script type="text/javascript">

window.onload = async () => {

  parent.postMessage("ready", "*");

window.addEventListener("message", async function listener(event) {

//window.addEventListener("load", async function listener(event) {

  if (event.data[0] == "gimme") {

    // eslint-disable-next-line

    var s = `<html><script>

      let result = {

        hardwareConcurrency : navigator.hardwareConcurrency

};

      window.parent.document.querySelector('#result').textContent = JSON.stringify(result);

      window.parent.postMessage(["frame_response"], "*");`;

    // eslint-disable-next-line

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

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

    let url = URL.createObjectURL(b);

    var iframe = document.createElement("iframe");

    iframe.src = url;

    document.body.append(iframe);

  } else if (event.data[0] == "frame_response") {

    let result = document.querySelector("#result").textContent;

    parent.postMessage(JSON.parse(result), "*");

});

</script>

<body>

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

</body>