[add .a (matches :is() branch)]
  hasAncestorWalkInvocations: 1
  hasAncestorWalkVisits: 3
  hasMatchInvocations: 1
  hasResultCacheHits: 0
  hasResultCacheMisses: 1
  styleInvalidations: 1
[swap to .b (other :is() branch)]
  hasAncestorWalkInvocations: 1
  hasAncestorWalkVisits: 3
  hasMatchInvocations: 1
  hasResultCacheHits: 0
  hasResultCacheMisses: 1
  styleInvalidations: 1