> And yet, there was no html5 newgrounds.

Let me introduce you to itch.io[0] where, in fact, people bang out HTML5 games at a rate that will stagger your eyeballs.

(Even me, a resolute "backend-only" dinosaur managed to use a HTML5 game engine to knock something out playable in an hour or two.)

[0] https://itch.io/games/platform-web - ~689k results