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 samplesupdated 21 Apr 2020