✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns — Slider direction correct ✓ Full slider range ✓ Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct — Live mass value ✓ Live volume value — Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Slider direction is inverted (dragging down = submerging crowns, which is correct, but top of slider at progress=0 keeps crowns in air — however the thumb starts at top=0% and moves down to increase submersion, which actually is correct directionally; the critical flaw is mass and density are static labels rather than live reactive values, and the crown shape (ellipse+polygon spikes arranged in a circle) looks unnatural and barely crown-like.
Slider direction is inverted (dragging down = submerging crowns, which is correct, but top of slider at progress=0 keeps crowns in air — however the thumb starts at top=0% and moves down to increase submersion, which actually is correct directionally; the critical flaw is mass and density are static labels rather than live reactive values, and the crown shape (ellipse+polygon spikes arranged in a circle) looks unnatural and barely crown-like.