Is support for webgames/HTML5 fully re-added yet? It's hard to tell, as few things have been announced on it, and the lack of webgame questions on the forum about 4.x is not reassuring.
I was looking into the state of that in the last week or so and I believe the answer is: not really, it's still generally recommended to use the LTS version (3) for projects targeting web/HTML5.