Tested on Oculus Go (with touchpad) and VR BOX2 (with joystick). For tests on a desktop (Windows 10 + Chrome) the "inline" webxr session and A,S,D,W,↑,↓ keys for navigation are used.
"Remake" of Kevin Levron's Bubbles (CodePen Circles Challenge).
WebXR samples     updated 21 Apr 2020