✓ 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 top maps to crowns in air, but the HTML orient=vertical with writing-mode:vertical-lr/direction:rtl means value=0 renders at the bottom, putting water at the top end — directionally ambiguous/browser-inconsistent), and splash particles fire probabilistically in the render loop rather than as a one-shot event, causing continuous particle spam during the entry phase.
Slider direction is inverted (min=0 top maps to crowns in air, but the HTML orient=vertical with writing-mode:vertical-lr/direction:rtl means value=0 renders at the bottom, putting water at the top end — directionally ambiguous/browser-inconsistent), and splash particles fire probabilistically in the render loop rather than as a one-shot event, causing continuous particle spam during the entry phase.