Quite a few people have used libgdx to create WebGL/HTML5 versions of their games, both 2D and 3D. Stefan Wagner, alias Bompo created this for the last ludum dare (click image to play):
It’s a 3D arcade game. You control a ship in a backyard pond and fire at other ships. Really neat for 48h!
Dimitry Fink created Stargazer for Android and Facebook:
Robert Engelbert ported his Frogger tutorial game not only to Android put to WebGL as well:
You should totally check out his blog which is filled with all kinds of game programming tutorials. He has a series on implementing frogger with various frameworks, including libgdx. Well worth a read.
Those are just 3 recent games i discoverd, there are a lot more WebGL/libgdx games out there already, some on the Google Chrome store. Let’s hope WebGL compatibility gets even better in the coming months!