Unity WebGL Particles Invisible? Causes and How to Fix…

I spent the better part of a day chasing a celebration firework that played perfectly in the Unity editor and rendered absolutely nothing in the WebGL build. No errors. The particles spawned, played, sat right in front of the camera — and stayed invisible.

I diagnosed it confidently four times. The first three were wrong. The only thing that ever found truth was a dumb A/B test in the actual build — not in the editor, not by reading shaders, not by theorizing. That turned out to be the real lesson, so I’ll tell it honestly — wrong turns and all — and then map out what WebGL genuinely can and can’t do with particles.