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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<script>
// This can't be in WPT because of bug 1766711.
let a = new AbortController()
a.abort()
let b = new File(['ó ¬—a'], 'a', {})
let c = new WritableStream()
b.stream().tee()[0].pipeTo(c, { 'signal': a.signal })
</script>