WPT
wpt / webaudio / the-audio-api / the-audiobuffersourcenode-interface / audiobuffersource-playbackrate-negative.html
Spec: Web Audio API ↗
Runs: Chrome 155.0.8041.0 (wpt@4a01b83e3, 2026-09-04) | Firefox 157.0a1 (wpt@e7122b73f, 2026-09-04) | Safari 251 preview (wpt@2c385f65e, 2026-09-04) | Ladybird 1.0-70fb3 (wpt@4a01b83e3, 2026-09-04) | 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 | 15/15 | 2/15 | 9/15 | 11/15 | 11/15 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| AudioBufferSourceNode supports negative playbackRate (-1.0) | PASS | FAIL | PASS | PASS | PASS | — |
| AudioBufferSourceNode supports high negative playbackRate (-2.0) | PASS | FAIL | PASS | PASS | PASS | — |
| AudioBufferSourceNode supports high negative playbackRate (-5.0) | PASS | FAIL | PASS | PASS | PASS | — |
| AudioBufferSourceNode supports fractional negative playbackRate | PASS | FAIL | PASS | PASS | PASS | — |
| AudioBufferSourceNode supports very low negative playbackRate (-0.02) | PASS | FAIL | PASS | PASS | PASS | — |
| AudioBufferSourceNode enters loop backwards from offset > loopEnd | PASS | FAIL | FAIL | FAIL | PASS | — |
| AudioBufferSourceNode clamps offset to loopStart for playbackRate < 0 | PASS | FAIL | PASS | PASS | FAIL | — |
| AudioBufferSourceNode loops backwards with negative rate (offset in loop) | PASS | PASS | FAIL | PASS | PASS | — |
| AudioBufferSourceNode handles offset exactly at duration with negative rate | PASS | FAIL | FAIL | FAIL | FAIL | — |
| AudioBufferSourceNode handles out-of-bounds start offset correctly | PASS | FAIL | FAIL | FAIL | FAIL | — |
| AudioBufferSourceNode performs sub-sample interpolation backwards | PASS | FAIL | FAIL | PASS | PASS | — |
| AudioBufferSourceNode ran successfully with zero delta and playbackRate 0 | PASS | PASS | PASS | PASS | PASS | — |
| AudioBufferSourceNode loops backwards using entire buffer when loopStart > loopEnd | PASS | FAIL | PASS | PASS | PASS | — |
| AudioBufferSourceNode loops backwards using clamped loopStart when loopStart < 0 | PASS | FAIL | FAIL | FAIL | FAIL | — |
| AudioBufferSourceNode loops backwards using entire buffer when loopEnd < 0 | PASS | FAIL | PASS | PASS | PASS | — |