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bradyd
on Nov 4, 2016
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“Ultrasonic cross-device tracking” embeds inaudibl...
The sound is probably coming from the LCD screen.
https://news.ycombinator.com/item?id=8862689
mSparks
on Nov 4, 2016
[–]
I discounted that at the time by playing a muted YouTube video and using keyboard shortcut forward back.
It only altered in any meaningful way to trackpad movements and clicks.
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