[add .x (anchor should stop being styled)]
  hasAncestorWalkInvocations: 1
  hasAncestorWalkVisits: 3
  hasMatchInvocations: 1
  hasResultCacheHits: 0
  hasResultCacheMisses: 1
  styleInvalidations: 1
[remove .x (anchor should be styled again)]
  hasAncestorWalkInvocations: 1
  hasAncestorWalkVisits: 3
  hasMatchInvocations: 1
  hasResultCacheHits: 0
  hasResultCacheMisses: 1
  styleInvalidations: 1