WPT
wpt / css / css-position / animations / top-interpolation.html
Spec: CSS Positioned Layout ↗
Runs: Chrome 155.0.8040.0 (wpt@476394464, 2026-09-03) | Firefox 157.0a1 (wpt@476394464, 2026-09-03) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-a7825 (wpt@a1e944e7a, 2026-09-03) | Servo Servo 0.6 (wpt@7e3d005d7, 2026-09-03) | Blitz a50cb8971 (wpt@a95401e4e, 2026-09-03)
View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi
| Chrome | Firefox | Safari | Ladybird | Servo | Blitz | |
|---|---|---|---|---|---|---|
| Total | 144/144 | 144/144 | 144/144 | 144/144 | 115/144 | 115/144 |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| CSS Transitions: property <top> from neutral to [20px] at (-0.3) should be [7px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from neutral to [20px] at (0) should be [10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from neutral to [20px] at (0.5) should be [15px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from neutral to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from neutral to [20px] at (1.5) should be [25px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from neutral to [20px] at (-0.3) should be [7px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from neutral to [20px] at (0) should be [10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from neutral to [20px] at (0.5) should be [15px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from neutral to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from neutral to [20px] at (1.5) should be [25px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from neutral to [20px] at (-0.3) should be [7px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from neutral to [20px] at (0) should be [10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from neutral to [20px] at (0.5) should be [15px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from neutral to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from neutral to [20px] at (1.5) should be [25px] | PASS | PASS | PASS | PASS | PASS | PASS |
| Web Animations: property <top> from neutral to [20px] at (-0.3) should be [7px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from neutral to [20px] at (0) should be [10px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from neutral to [20px] at (0.5) should be [15px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from neutral to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from neutral to [20px] at (1.5) should be [25px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (-0.3) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (0) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (0.3) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [initial] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (-0.3) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (0) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (0.3) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [initial] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (-0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (0) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [initial] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (-0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (0) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [initial] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (-0.3) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (0) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (0.3) should be [initial] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [initial] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| Web Animations: property <top> from [initial] to [20px] at (-0.3) should be [initial] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [initial] to [20px] at (0) should be [initial] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [initial] to [20px] at (0.3) should be [initial] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [initial] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [initial] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [initial] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [initial] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| CSS Transitions: property <top> from [inherit] to [20px] at (-0.3) should be [33px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [inherit] to [20px] at (0) should be [30px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [inherit] to [20px] at (0.5) should be [25px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [inherit] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [inherit] to [20px] at (1.5) should be [15px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [inherit] to [20px] at (-0.3) should be [33px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [inherit] to [20px] at (0) should be [30px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [inherit] to [20px] at (0.5) should be [25px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [inherit] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [inherit] to [20px] at (1.5) should be [15px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [inherit] to [20px] at (-0.3) should be [33px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [inherit] to [20px] at (0) should be [30px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [inherit] to [20px] at (0.5) should be [25px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [inherit] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [inherit] to [20px] at (1.5) should be [15px] | PASS | PASS | PASS | PASS | PASS | PASS |
| Web Animations: property <top> from [inherit] to [20px] at (-0.3) should be [33px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [inherit] to [20px] at (0) should be [30px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [inherit] to [20px] at (0.5) should be [25px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [inherit] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [inherit] to [20px] at (1.5) should be [15px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (-0.3) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (0) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (0.3) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-behavior:allow-discrete: property <top> from [unset] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (-0.3) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (0) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (0.3) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <top> from [unset] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (-0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (0) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [unset] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (-0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (0) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (0.3) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [unset] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (-0.3) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (0) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (0.3) should be [unset] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [unset] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| Web Animations: property <top> from [unset] to [20px] at (-0.3) should be [unset] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [unset] to [20px] at (0) should be [unset] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [unset] to [20px] at (0.3) should be [unset] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [unset] to [20px] at (0.5) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [unset] to [20px] at (0.6) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [unset] to [20px] at (1) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [unset] to [20px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| CSS Transitions: property <top> from [-10px] to [10px] at (-0.3) should be [-16px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [-10px] to [10px] at (0) should be [-10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [-10px] to [10px] at (0.5) should be [0px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [-10px] to [10px] at (1) should be [10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions: property <top> from [-10px] to [10px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [-10px] to [10px] at (-0.3) should be [-16px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [-10px] to [10px] at (0) should be [-10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [-10px] to [10px] at (0.5) should be [0px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [-10px] to [10px] at (1) should be [10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Transitions with transition: all: property <top> from [-10px] to [10px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [-10px] to [10px] at (-0.3) should be [-16px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [-10px] to [10px] at (0) should be [-10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [-10px] to [10px] at (0.5) should be [0px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [-10px] to [10px] at (1) should be [10px] | PASS | PASS | PASS | PASS | PASS | PASS |
| CSS Animations: property <top> from [-10px] to [10px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | PASS | PASS |
| Web Animations: property <top> from [-10px] to [10px] at (-0.3) should be [-16px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [-10px] to [10px] at (0) should be [-10px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [-10px] to [10px] at (0.5) should be [0px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [-10px] to [10px] at (1) should be [10px] | PASS | PASS | PASS | PASS | FAIL | FAIL |
| Web Animations: property <top> from [-10px] to [10px] at (1.5) should be [20px] | PASS | PASS | PASS | PASS | FAIL | FAIL |