Re: [w3ctag/design-reviews] WebRTC-SVC (Scalable Video Coding) (#396)

@cynthia Originally, we referenced the scalability mode names defined in the AV1 specification, but we weren't sure those were the right set of scalability modes, so we used DOMStrings instead of enums. That turned out to be a good choice, because we had to subsequently define our own scalability mode names, which are in some cases different from those used in the AV1 specification (e.g. note the differences in the KEY and KEY_SHIFT modes in the tables). 

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