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<!DOCTYPE html>
<meta charset="utf8">
<body>
<output id="result"></output>
<script type="text/javascript">
window.addEventListener("load", function listener(event) {
parent.postMessage(["frame_ready"], "*");
});
window.addEventListener("message", function listener(event) {
if (event.data[0] == "gimme") {
let result = {
hardwareConcurrency : navigator.hardwareConcurrency
};
parent.postMessage(["frame_response", result], "*");
}
});
</script>
</body>
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