It's webkit port for embbedded devices. You can find more information on this site https://webkit.org/wpe/.
Watching the presentation at https://www.youtube.com/watch?v=27o_f_b1U3Q, it looks more like they're focused on making things like media players and settop boxes than, say, an IoT thermostat. And you'll need a Cortex-A class device or greater running Linux.