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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) {
if (event.data[0] == "gimme") {
var s = `<html><script>
window.addEventListener("load", async function listener(event) {
parent.postMessage(["frame_ready"], "*");
});
window.addEventListener('message', async function listener(event) {
if (event.data[0] == 'frame_request') {
let result = {
hardwareConcurrency : navigator.hardwareConcurrency
};
parent.postMessage(['frame_response', result], '*');
}
});`;
// eslint-disable-next-line
s += `</` + `script></html>`;
let iframe = document.createElement("iframe");
iframe.src = "data:text/html;charset=utf-8," + s;
document.body.append(iframe);
} else if (event.data[0] == "frame_ready") {
let iframe = document.getElementsByTagName("iframe")[0];
iframe.contentWindow.postMessage(["frame_request"], "*");
} else if (event.data[0] == "frame_response") {
parent.postMessage(event.data[1], "*")
}
});
</script>
<body>
<output id="result"></output>
</body>