Re: [webcomponents] [Shadow]: Figure out a good replacement for /deep/ in testing scenarios (bugzilla: 28591) (#78)

This seems like quite a basic affordance, without which there is an unbridgeable gap between the Chrome and Firefox implementations (utilise/all#1 | [doc](https://github.com/utilise/utilise#--all)). We [rely quite heavily](https://github.com/rijs/components) on this ability. It looks like everyone is on the same page too (i.e. good in JS, bad in CSS). Is there any chance `/deep/` or `>>>` in `querySelector/All` could be included in v1?

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