Re: [mediacapture-region] What should the spec say about elements like HTMLAudioElement? (#51)

Here is my proposed first draft of definition for which Element subtypes should be allowed.
```
The Element-subtype is associated with a non-null, well-defined subsection of the viewport.
To be well-defined, both the size and opacity must be sufficiently specified.
```

Note:
* This refer Element's subtype. It does not matter if the specific instance is outside the viewport at the moment of minting.
* By "sufficiently specified" I seek to ensure that the developer gets as close to what he's asked for as possible, cross-platform. The limitations are discussed in [this message](https://github.com/w3c/mediacapture-region/issues/51#issuecomment-1139928924) (search for "div-containing-a-player").

I would have liked to include sensibility/usefulness, but I agree that it would be difficult to define, so let's shelve that for now.

If (i) a non-null bounding box is easier to reach consensus on than (ii) well-defined size and opacity, then we can start with (i) and get back to (ii) later.

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Received on Thursday, 2 June 2022 09:37:49 UTC