Re: [mediacapture-record] Fingerprint surface coming from 'isTypeSupported' - needs consideration? (#142)

@npdoty 

Perhaps you did not understand the question that was asked. 

Precisely what is "the fingerprinting surface"? 

Discovery of hardware capabilities `navigator.hardwareConcurrency`, `navigator.connection`, `navigator.userAgentData.mobile`, `navigator.hid`, `navigator.deviceMemory`, `navigator.getBattery().then(console.log)`, `navigator.languages`?

How is `isTypeSupported()` different from

```
navigator.mediaCapabilities.encodingInfo({
    type : 'record',
    video : {bitrate:120000, height: 1080, width: 1920, framerate:30, contentType : "video/x-matroska;codecs=avc1"}
}).then(console.log)
```

?

What is the exact action an individual or institution can _do_ with the information provided by `isTypeSupported()`?

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