For 20 years I read about the possibility, but I just witnessed an irreversible physical damage attack against a laptop from a web page.
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I once blew my Chromebook speakers simply by messing with the volume levels after unlocking root (without any sound coming out). Melted.
My only guess is either they were DC coupled and had a nonzero DC bias applied, or it was ultrasound. They fixed it in a kernel update.
