They never paint.
Created attachment 261554 [details] patch
Comment on attachment 261554 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=261554&action=review > LayoutTests/ChangeLog:9 > + * fast/shadow-dom/shadow-hides-children-expected.html: Added. > + * fast/shadow-dom/shadow-hides-children.html: Added. Can we name these tests: css-scoping-shadow-root-hides-children.html?
https://trac.webkit.org/r190006
*** Bug 149327 has been marked as a duplicate of this bug. ***