Re: [w3c/manifest] Required WebAppManifest Member clarification (#799)

Interesting that serviceworker was mandatory! (It certainly wasn't, since [nobody has ever implemented it](https://github.com/w3c/manifest/issues/800).)

Yeah I think the right answer is that no field is absolutely mandatory of the manifest. However, many fields are required by certain processors in order to be accepted as a valid app. For example, Google Chrome (according to [this](https://developers.google.com/web/fundamentals/app-install-banners/)) requires (at least) the following in order to show an install banner:

- `name` or `short_name`
- `icons`
- `start_url`
- `display` set to something other than `browser`

It wouldn't be correct to say these are mandatory in the manifest itself. But they are required by that user agent. I have always wanted us to create a standard definition of a "PWA" so we can standardize across browsers, but in the mean time, each user agent has its own possibly conflicting set of requirements to be installable.

If you're writing a validator, you may want to take these into account, but there's a nuance to it beyond just "invalid" / "valid".


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