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The 3DS and Wii U use some WebKit fork; they don't use Presto.

Opera Mini still uses Presto, and there are some TVs which in principle are still supported that use Presto.

Both consoles use NetFront (from Access)

Which is nowadays based on some fork of WebKit.

Ah, right! I haven't been keeping up with the latest internal specs of modern Nintendo devices.

I guess I was partially right though, as I do remember the original Wii using Opera for the Internet Channel: https://en.wikipedia.org/wiki/Internet_Channel

Presto may have been used in a lot of places.

I'm like 80% sure my Mazda head-unit uses a heavily bastardized version of presto as its rendering engine and most of the UI is written in html/js/css.

Probably unsafe to use by now, since not updated and full with vulnerabilities.