The engine, not a recording
This is the same bundle the test suite runs against, served from this site. Move the pointer over the stage or use the arrow keys; the inspector on the right shows which nodes went dirty and which surfaces were rebuilt for that frame.
Needs a desktop browser with WebGL. Acceptance was run in Chrome 144; the structured GPU scenes fall back to P2 Structured CPU if WebGL is unavailable, which is slower but shows the same structure.
What to try
Move the pointer across the stage
Drives the timeline and spectral axes together.
Arrow keys
Step the timeline; shift for a larger step.
Switch backend
P4 GPU, P2 CPU and P0 Video draw the same state through different paths.
Drop quality to L0
Watch which detail disappears first — that is the S2 band.
Lock K0 identity
Then move everything else. Identity stays put because it is a separate layer.