✓ 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: the label says "▲ Luft" at the top but the writing-mode/rtl CSS causes slider value=0 (air) to visually sit at the bottom, while dragging up increases value toward water — the semantic mapping is backwards from the intended UX.
Slider direction is inverted: the label says "▲ Luft" at the top but the writing-mode/rtl CSS causes slider value=0 (air) to visually sit at the bottom, while dragging up increases value toward water — the semantic mapping is backwards from the intended UX.