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As we discuss initial implementation experience from the spec, there are some features that we think may be at risk. These features will need to be marked before CR but this bug can tracks the discussion to determine those features.
Bug 20336 proposed removing the keysystem attribute from the <source> element. We decided to keep it but this may need to be marked at risk to see if people actually implement and do so interoperably.
I think we can close this since this will be enforced by process and there are no such items being tracked by bugs at the moment.
I am marking this bug as RESOLVED LATER this the HTML Media Extensions WG will identify the appropriate "at risk" features (if any) when we request transition into Candidate Recommendation. /paulc HTML HME WG Chair
This is being discussed in https://github.com/w3c/encrypted-media/issues/206.