Re: [w3c/webcomponents] Theming options for shadow roots (#864)

This is the most developed one that I know of: https://github.com/vaadin/vaadin-themable-mixin (cc @web-padawan)

You could basically consider the `@apply` polyfill an example of userland theming. Details of implementation somewhere deep in here: https://github.com/webcomponents/polyfills/tree/master/packages/shadycss

And @aomarks has been looking at a new system inspired by Vaadin's themable work, `@apply`, the `::theme` idea and CSS shadow parts.

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