✓ 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 (min=0 at top means crowns start in air, which is correct in outcome, but the crowns don't touch water until ~80% of slider travel due to geometric miscalculation, leaving a large dead zone; no smooth fall/descent animation — crowns teleport per slider position with no independent motion.
Slider direction is inverted (min=0 at top means crowns start in air, which is correct in outcome, but the crowns don't touch water until ~80% of slider travel due to geometric miscalculation, leaving a large dead zone; no smooth fall/descent animation — crowns teleport per slider position with no independent motion.