Re: [w3c/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

> I think it's premature to try to come up with a set of compassable features like that. I think we need to first come up with a list of use cases that aren't adequately addressed by the current Web API (besides is attribute), and spec API for those.

Sure. I'll mention the use cases we've had again:

- Custom table rows, list items etc
- Custom elements that have inputs in shadow roots (currently they don't serialise on submit), related https://github.com/w3c/webcomponents/issues/187
- Custom elements that have reset / submit buttons in shadow roots (currently they don't do anything)


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