The "selecting through shadows selector" (also referred to "shadow-piercing descendant combinator") allows selecting elements within regardless of them being in a ShadowRoot or nested ShadowRoot or not. It is somewhat similar to ::shadow . Note: The ">>>" selector used to be called "/deep/" (and is currently implemented in Chrome as "/deep/". Link to specification for reference: http://dev.w3.org/csswg/css-scoping-1/#deep-combinator  https://bugzilla.mozilla.org/show_bug.cgi?id=1112251
Component: Untriaged → CSS Parsing and Computation
Product: Firefox → Core
See Also: → 1112251
Severity: normal → enhancement
Status: UNCONFIRMED → NEW
Ever confirmed: true
OS: Mac OS X → All
Hardware: x86 → All
Version: 37 Branch → unspecified
We should not implement this until there's agreement that this is actually desired. See https://github.com/w3c/webcomponents/issues/78.
See Also: → https://github.com/w3c/webcomponents/issues/78
It seems that Chrome 60 will be treating the >>> combinator as the descendant combinator, so perhaps it would be wise to simply follow suit? https://developers.google.com/web/updates/2017/06/chrome-60-deprecations#make_shadow-piercing_descendant_combinator_behave_like_descendent_combinator
Thomas, as per comment 1 I don't think we should implement this. There's no agreement on this feature.
I agree, but we may wish to wait and see if we need to support it as a descendant combinator as Chrome does per comment 2 (for the sake of webcompat).
Based on the current state of the spec issues -> WONTFIX.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → WONTFIX
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