Re: [webcomponents] Sharing styles across custom elements (#282)

Custom properties won't help me always. For example, I want to use font-awesome in my components. Currently, I am using /deep/ combinator for all classes in fa. How can I achieve the same without that? I would end up repeating those classes in all components. 

I understand the complexities involved in supporting shadow-piercing combinators. However, I still feel that custom properties wouldn't be just sufficient. I will read about construct stylesheets spec.

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https://github.com/w3c/webcomponents/issues/282#issuecomment-124192359