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<!DOCTYPE html>
<meta charset="utf8">
<script type="text/javascript">
window.onload = () => {
parent.postMessage("ready", "*");
}
window.addEventListener("message", function listener(event) {
if (event.data[0] == "gimme") {
let iframe = document.createElement("iframe");
iframe.src = "/browser/browser/components/resistfingerprinting/test/browser/file_hwconcurrency_sandboxediframe_double_framee.html";
iframe.sandbox = "allow-scripts";
document.body.append(iframe);
} else if (event.data[0] == "frame_ready") {
let iframe = document.getElementsByTagName("iframe")[0];
iframe.contentWindow.postMessage({0: "gimme"}, "*");
} else if (event.data[0] == "frame_response") {
parent.postMessage(event.data[1], "*")
}
});
</script>
<body>
<output id="result"></output>
</body>
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