Re: [w3c/manifest] Abstracting selecting an icon. (#710)

> BUT the problem is that we don't want to trash the whole manifest if one member is invalid. If one member throws a TypeError, we generally want to ignore that member, not the whole thing.

Yes, exactly. So to do that, we would need to implement a custom IDL binding layer. That's no feasible. 

Our (Gecko's) implementation just runs the old processing rules:
https://github.com/mozilla/gecko-dev/blob/master/dom/manifest/ManifestProcessor.jsm#L65

We just do simple processing, it doesn't go through the IDL binding layer. Does Chrome's implementation go through the IDL layer? 

> It seems that this isn't an issue with using IDL in a document format, but rather that IDL's conversion algorithm doesn't have a "non-strict mode" (that I know of). 

That's really not feasible. We don't need to fork our IDL biding layer for this format. 

I think we need to go and figure out https://github.com/whatwg/infra/issues/159


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