I have seen one more discussion which is still opened now. However, the latest message is posted over the year ago. Don't want to believe, but it could be an abandoned proposal. Even if it looks as a great replacement for customized built-in elements. More powerful, IMO, because mixins are usually have more opportunities than inheritance.
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Thanks for the feedback. Regarding the Custom Attributes, the only discussion I remember is this issue and also this shim by Matthew Phillips.
I don't have a strong opinion on this yet, but probably such a spec could take meta programming over DOM to the next level (if done right).
Also, I'm not sure how much performant would it be.
I have seen one more discussion which is still opened now. However, the latest message is posted over the year ago. Don't want to believe, but it could be an abandoned proposal. Even if it looks as a great replacement for customized built-in elements. More powerful, IMO, because mixins are usually have more opportunities than inheritance.