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From https://github.com/w3c/webcomponents/issues/37: Looking for "scope" or "/deep" or similar terms in the spec doesn't produce any meaningful result--because there is no mention to said selectors in the Shadow DOM spec. But as a developer I would expect at least a mention to: http://dev.w3.org/csswg/css-scoping/ This is the web, right? we link things together
Agreed. That makes sense. Added at https://github.com/w3c/webcomponents/commit/fc058000d0cf3e2350aa5c467fa59e684d1358b1