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

@matthewrobb not to be ironic but you basically wrote native built-in extends as these are defined already in the current V1 specification.

The selector though, should rather be:

```css
form *[is=button-like] {

}
```
to not reinvent the wheel on CSS land too.

If `is` attribute won't be used as defined in both V0 and V1 I'd finally agree with this thread topic: the `is` attribute is confusing (and at this point it will break if not patched for those browsers that shipped either V0 or V1 already)

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