WPT
wpt / mediacapture-extensions / MediaStreamTrack-video-stats.https.html
Spec: Media Capture and Streams Extensions ↗
Runs: Chrome 155.0.8039.0 (wpt@6ec9fd59f, 2026-09-03) | Firefox 157.0a1 (wpt@6ec9fd59f, 2026-09-03) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-795e1 (wpt@7e3d005d7, 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 | 15/15 | 0/15 | 0/15 | 0/15 | 0/15 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| totalFrames increases over time | PASS | FAIL | FAIL | FAIL | FAIL | — |
| deliveredFrames increases, even without sinks | PASS | FAIL | FAIL | FAIL | FAIL | — |
| discardedFrames increases when frameRate decimation is happening | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Counters increase even if we don't call the track.stats getter | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Counters do not increase in the same task execution cycle | PASS | FAIL | FAIL | FAIL | FAIL | — |
| totalFrames is the sum of deliveredFrames and discardedFrames | PASS | FAIL | FAIL | FAIL | FAIL | — |
| SameObject policy applies | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Stats are frozen while disabled | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Disabling and re-enabling does not reset the counters | PASS | FAIL | FAIL | FAIL | FAIL | — |
| New stats baselines when a track is cloned from a disabled track | PASS | FAIL | FAIL | FAIL | FAIL | — |
| New stats baselines when a track is cloned from an enabled track | PASS | FAIL | FAIL | FAIL | FAIL | — |
| New stats baselines for the clone of a clone | PASS | FAIL | FAIL | FAIL | FAIL | — |
| A low FPS clone does not affect the original track's discardedFrames | PASS | FAIL | FAIL | FAIL | FAIL | — |
| track.stats is null on non-device tracks, such as canvas | PASS | FAIL | FAIL | FAIL | FAIL | — |
| track.stats is supported on getDisplayMedia tracks | PASS | FAIL | FAIL | FAIL | FAIL | — |