The spec mentions:

Media data processed by a CDM MAY be unavailable through JavaScript APIs in the usual way (for example using the CanvasRenderingContext2D drawImage() method and the AudioContext MediaElementAudioSourceNode). This specification does not define conditions for such non-availability of media data, however, if media data is not available to JavaScript APIs then these APIs MAY behave as if no media data was present at all.

I figured this test would be useful to know which browsers allow this (chrome) and which ones don't (firefox)! Hopefully others do too, but I understand if it's not in the scope of this project.

I basically copy/pasted an existing test, so any recommendations for naming or robustness are most welcome!