✓ 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 (label says top=Luft/air and bottom=submerged, but the vertical-lr + rtl writing-mode with min=0 at visual top actually maps value=0 to the top which is "air" — however the CSS uses writing-mode:vertical-lr direction:rtl which on most browsers renders min at bottom and max at top, making slider_direction_correct=false); all physics values (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass) are accurate and the gilded crown correctly displaces ~48% more water.
Slider direction is inverted (label says top=Luft/air and bottom=submerged, but the vertical-lr + rtl writing-mode with min=0 at visual top actually maps value=0 to the top which is "air" — however the CSS uses writing-mode:vertical-lr direction:rtl which on most browsers renders min at bottom and max at top, making slider_direction_correct=false); all physics values (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass) are accurate and the gilded crown correctly displaces ~48% more water.