Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

> For example, is share() really several methods in one? Might a discrete shareFile() method have been cleaner? I'm not saying it is, just using it as an example.

That decision isn't fixed in stone yet. It's part of this proposal:
http://wicg.github.io/web-share/level-2/

Maybe, but we also want to be able to share a file along with the other metadata at the same time (e.g., share a URL along with a screenshot).

What I'm asking here, at a high level, is: should there be a standardized pattern for how to do this kind of sub-feature detection, or should each API build its own? The suggestion to use a separate `shareFile` method suggests that each API should be finding its own way of supplying the new features.

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