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<!DOCTYPE html>
<meta charset="utf8">
<script>
window.onload = async () => {
parent.postMessage("ready", "*");
}
window.addEventListener("message", async function listener(event) {
if (event.data[0] == "gimme") {
var result = [];
// Prepare for test of AudioContext.currentTime
// eslint-disable-next-line
let audioContext = new AudioContext();
// Known ways to generate time stamps, in milliseconds
const timeStampCodes = [
"performance.now()",
"new Date().getTime()",
"new Event(\"\").timeStamp",
"new File([], \"\").lastModified",
];
// These are measured in seconds, so we need to scale them up
var timeStampCodesDOM = timeStampCodes.concat([
"audioContext.currentTime * 1000",
]);
for (let timeStampCode of timeStampCodesDOM) {
// eslint-disable-next-line no-eval
let timeStamp = eval(timeStampCode);
result.push({
'name': timeStampCode,
'value': timeStamp
});
}
let worker = new SharedWorker("file_reduceTimePrecision_iframe_worker.sjs");
let worker_result = await new Promise(resolve => {
worker.port.onmessage = function(e) {
resolve(e.data);
};
});
for (let item of worker_result) {
result.push(item);
}
parent.postMessage(result, "*")
}
});
</script>