Currently they are owned by RuleData. Several RuleData objects can refer to the same StyleRule, requiring recompilation. Compiled selectors are context-independent so they can be shared between all clients.
Created attachment 333373 [details] patch
Created attachment 333455 [details] patch
Comment on attachment 333455 [details] patch Clearing flags on attachment: 333455 Committed r228313: <https://trac.webkit.org/changeset/228313>
All reviewed patches have been landed. Closing bug.
<rdar://problem/37383334>