

I’m pretty surprised that all of the audio formats work. I’m not so surprised that the TV has h265, although maybe a bit surprised that it is exposed to the browser. The container support is also pretty surprising. Unless your MKVs are so simple that they are effectively WEBM.
Or maybe it pops the link out of the browser into a dedicated media player which has decent codec support.
iDevices do expose h265 in the browser, but the container support is still a bit surprising. But then again WEBM is basically MKV, so maybe that is why it tends to work.
Yeah mp4s with h264 will play basically anywhere if the audio format is a common one. Must be the most supported setup.