In bug 1368240 I added some invalidation that makes us restyle a lot less in cases when there are combinators. We can only test whether we've have or haven't restyled right now, but it'd be nice to add an API to get the number of elements restyled in order to test it more precisely.
Would it be easy to just add a style-perf test  for this?  https://github.com/heycam/style-perf-tests
Yes, that's the plan, but to prove correctness we may also want to verify we've restyled more exactly.
Ok, over to emilio.
Assignee: nobody → emilio+bugs
status-firefox55: --- → wontfix
status-firefox56: --- → wontfix
status-firefox57: --- → affected
status-firefox-esr52: --- → wontfix
status-firefox57=wontfix unless someone thinks this bug should block 57
status-firefox57: affected → wontfix
Status: NEW → RESOLVED
Last Resolved: 2 months ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1422010
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