Thanks! The green line is gone, but unfortunately there's still a misalignment:
This only happens on
Chrome for Android. The alignment on other browsers (Chrome, Firefox and Safari on a Mac, Safari on iOS and the Oculus Browser on an Oculus Go) I tested with is pixel perfect.
Oh, and important thing - renderer="css3d" or renderer="webgl"?
WebGL, because it has to work in VR.