The possible User Agent of the Switch has been posted to nsbrew.org. If this article is accurate, then it looks like the Switch will not only have a browser but will also run Webkit. Looking at the edit history of that page reveals the source to be: https://html5test.com/s/bb5a4133ac112038.html
Webkit..... https://www.exploit-db.com/exploits/40183/ https://www.exploit-db.com/exploits/40184/ ....right
You seriously think they haven't learned their lessons on having an open-source web browser on their consoles? Oh yeah, it's Nintendo ...