Device and app evidence
Check browser media capability for one codec profile
Browser media APIs can report support for a specified MIME type and codecs or a playback configuration. Results depend on the device and the exact declaration.
Browser media APIs can report support for a specified MIME type and codecs or a playback configuration. Results depend on the device and the exact declaration.
Confirm the exact product or platform
| Check | Manufacturer or publisher evidence |
|---|---|
| Platform | Web browsers |
| Publisher | MDN Web Docs |
| Lightweight type check | HTMLMediaElement.canPlayType |
| Configuration check | MediaCapabilities.decodingInfo |
What to do on your device
- Record browser version, MIME type and declared codec from a test source that you are allowed to inspect.
- Compare the browser’s reported capability with actual playback using a known sample.
- For service playback that still fails, record the result and error for the publisher without posting private account data.
Test the viewing task
Use one authorized programme with a known audio or caption track. Check the same task after the documented change. If the result differs, report the model, OS or app version and the format or connection that the guide above applies to.