Here are a few scenes for WebVR (exported from Unity):
Campfire scene: https://adityabawankule.me/Unity/WebVR/Campfire/index.html
Island scene: https://adityabawankule.me/Unity/WebVR/Beach/index.html
Default scene: https://adityabawankule.me/Unity/WebVR/Test/index.html
New default scene, with interaction: https://adityabawankule.me/Unity/WebVR/Build/index.html
The WebVR implementation seems to work for GearVR pretty well (minus some performance issues), but the Cardboard version doesn’t seem to work right now, seems to be a Unity WebGL export problem.
Here is the exporter maintained by Mozilla: https://github.com/mozilla/unity-webvr-export