Re: [w3ctag/design-reviews] Media Source Extensions for WebCodecs (#576)

Apologies for the delay.

> Did y'all have any feedback on whether these new append methods should be added as promise based? Should the interface use the non-promise style (updating, updateend events) for consistency until byte-based promise methods are available? Should we only add the promise based method for chunks once we have a promise based method for bytes?

@plinss, @atanassov and I discussed during our VF2F today. And one of the concerns we had were if promises would provide the latency guarantees that the downstream application needs (given that current MSE is event driven, it should be okay?), and if a domain specific application of promises would make it painful to upgrade when byte-based promises are available. We don't have a strong preference for either, but we'd like to hear your thoughts on this.

Does the current design propose a generic path forward for a byte-based promise API? If so, we think promises are probably the right answer.

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