Re: [w3c/webcomponents] [idea] making builtin elements more like custom elements (#785)

We're not going to do this due to performance issues but also because browser engine code needs to update its internal states prior to start invoking JavaScript. It's simply not attainable to make all builtin elements' implementation work with the proposed API.

It's possible we can add some mutation observer observation records for when a node is connected or disconnected though.

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