Re: [WICG/webcomponents] custom pseudo elements like ::before ::after, but using custom elements (Issue #983)

@trusktr ,
> Maybe [declarative custom elements](https://github.com/WICG/webcomponents/blob/gh-pages/proposals/Declarative-Custom-Elements-Strawman.md) would solve this.

You must be joking. There is nothing `declarative` about proposal you mentioned. 
Alternative would be [pure declarative syntax](https://github.com/EPA-WG/custom-element). 

Exposing the DCE to CSS as `::custom-element-pseudo('my-element')` is definitely a great idea. 
The polyfill should be implementable but aware of custom elements registry scopes. I.e. have more sense to be a part of scoping. 

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