This is the kicker for me: > At time of writing, no browser has implemented customized built-in elements. Chrome plans to implement them (status) but other bro

This is the kicker for me: > At time of writing, no browser has implemented customized built-in elements. Chrome plans to implement them (status) but other browsers have expressed distaste for implementing the is="" syntax. I would love to just be able to "fix" the normalization around several built-in elements.