OffscreenCanvas
Fallback
Checks constructor support.
HAAM browser lab
OffscreenCanvas readiness for responsive production tools
This lab checks whether canvas rendering can move into a worker, then runs a bounded preview job with a normal canvas fallback for unsupported browsers.
Canvas transfer
Fallback
Checks transferControlToOffscreen.
Worker
Fallback
Checks dedicated worker support.
Support score
0/3
The worker path needs all three capabilities.
Canvas render job
Worker render with fallback
Ready to render a bounded preview job.
Execution detail
Why this matters
- Mode
- not run
- Last render
- No completed render yet
- Production use
- Thumbnail generation, preview rendering, image transforms, export frames, minimaps, and visual QA can run away from the main UI thread when worker canvas support is available.
The worker path transfers the canvas permanently. This is why the lab disables repeat worker runs on the same canvas. Refresh the page to run the transfer path again.