WPT
wpt / long-animation-frame / loaf-layout-duration.html
Spec: Long Animation Frames API ↗
Runs: Chrome 155.0.8041.0 (wpt@18be93235, 2026-09-04) | Firefox 157.0a1 (wpt@1b4bc17cf, 2026-09-04) | Safari 251 preview (wpt@2c385f65e, 2026-09-04) | Ladybird 1.0-17043 (wpt@25681acff, 2026-09-04) | Servo Servo 0.6 (wpt@2c385f65e, 2026-09-04) | 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 | 7/7 | 0/7 | 0/7 | 0/7 | 0/7 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| layoutDuration attribute exists on PerformanceLongAnimationFrameTiming | PASS | — | — | — | — | — |
| layoutDuration is 0 when no rendering phase occurs | PASS | — | — | — | — | — |
| layoutDuration captures render-phase layout | PASS | — | — | — | — | — |
| layoutDuration does not exceed frame duration | PASS | — | — | — | — | — |
| layoutDuration does not include forced layout from scripts (tracked separately) | PASS | — | — | — | — | — |
| layoutDuration is measured during the render phase | PASS | — | — | — | — | — |
| layoutDuration captures layout during ResizeObserver callbacks | PASS | — | — | — | — | — |