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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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.