WPT
wpt / media-source / mediasource-activesourcebuffers.html
Spec: Media Source Extensions™ ↗
Runs: Chrome 155.0.8039.0 (wpt@d0c38285b, 2026-09-03) | Firefox 157.0a1 (wpt@ed1909ed6, 2026-09-03) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-56c61 (wpt@cc4d45aa0, 2026-09-03) | Servo Servo 0.6 (wpt@09159dcb3, 2026-09-02) | Blitz 188486089 (wpt@a95401e4e, 2026-09-02)
View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi
| Chrome | Firefox | Safari | Ladybird | Servo | Blitz | |
|---|---|---|---|---|---|---|
| Total | 8/8 | 6/8 | 8/8 | 4/8 | 0/8 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| SourceBuffer added to activeSourceBuffers list when its only audio track gets loaded (and thus becomes enabled). | PASS | PASS | PASS | PASS | — | — |
| SourceBuffer added to activeSourceBuffers list when its only video track gets loaded (and thus becomes selected). | PASS | PASS | PASS | PASS | — | — |
| Active SourceBuffers must appear in the same order as they appear in the sourceBuffers attribute: audio is first sourceBuffer, audio media appended first | PASS | PASS | PASS | PASS | — | — |
| Active SourceBuffers must appear in the same order as they appear in the sourceBuffers attribute: audio is first sourceBuffer, video media appended first | PASS | PASS | PASS | FAIL | — | — |
| Active SourceBuffers must appear in the same order as they appear in the sourceBuffers attribute: video is first sourceBuffer, audio media appended first | PASS | PASS | PASS | FAIL | — | — |
| Active SourceBuffers must appear in the same order as they appear in the sourceBuffers attribute: video is first sourceBuffer, video media appended first | PASS | PASS | PASS | PASS | — | — |
| Active SourceBuffers list reflects changes to selected audio/video tracks associated with separate SourceBuffers. | PASS | FAIL | PASS | FAIL | — | — |
| Active SourceBuffers list ignores changes to selected audio/video tracks that do not affect the activation of the SourceBuffer. | PASS | FAIL | PASS | FAIL | — | — |