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

saschanaz left a comment (whatwg/webidl#107)

The supportedOptions stuff becomes trickier if each member has to be validated or depends on other members. For Web Share:

1. `files: []` would throw unless any of title/text/url exists
2. [Not all file types are accepted](https://www.w3.org/TR/web-share/#dfn-validate-share-data): 
   > If the user agent believes sharing any of the files in files would result in a potentially hostile share (i.e., the user agent determines a file is malicious in some way, because of its contents, size, or other characteristic), return false.
3. `url` would throw for unsafe schemes

 `supportedOptions` wouldn't be able to express such complexity, unless we complicate `supportedOptions` itself.

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