MediaRecorder/AudioRecorder polyfill?

I need a web app to be able to record and playback audio on the client’s side.
As far as my researches went, there seems to be no standard for this supported by all browsers, but MediaRecorder API together with AudioRecorder polyfill seems to support the majority.

While declaring into APIs is not unknown to me, all the web stuff is. Are there any guides on how to leverage such a thing with Xojo? Or, even better: Did someone do this already?

I’d recommend checking out these:

Wrapping them up in a custom control wouldn’t be too difficult either