This page allows you to check if a given ISOBMFF-based MIME type is supported in your browser. Given the wide variety of ISOBMFF files, it is sometimes difficult to know in advance if a MIME type will be supported. This page shows test results using the HTMLMediaElement.canPlayType and MediaSource.isTypeSupported methods for various versions of ISOBMFF MIME types, in particular for codecs as registered on the MP4 Registration Authority.
You can check General MIME Types, General track codecs, Audio codecs and Video codecs, in particular all AVC profiles, AV1 profiles or other video codecs such as VP9, HEVC or test your own codec.
This other page is dedicated to testing the Media Capabilities API.
The code for this page is hosted on GitHub here. If you see any mistake, please file an issue or submit a pull request.