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<script>
async function stuff() {
let arr = new ArrayBuffer(500000);
let blob = new Blob([arr]);
let file = new File([blob], "", { });
let dir = await self.navigator.storage.getDirectory();
let handle = await dir.getFileHandle("514600c6-596b-4676-ab0c-3e6f1e86759f", {"create": true});
let wfs = await handle.createWritable({"keepExistingData": true});
await file.stream().pipeTo(wfs);
};
document.addEventListener("DOMContentLoaded", stuff);
</script>
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