[insert <span class='match'> into anchor subtree]
  hasAncestorWalkInvocations: 1
  hasAncestorWalkVisits: 2
  hasMatchInvocations: 1
  hasResultCacheHits: 0
  hasResultCacheMisses: 1
  styleInvalidations: 3
[remove the matching span]
  hasAncestorWalkInvocations: 1
  hasAncestorWalkVisits: 2
  hasMatchInvocations: 1
  hasResultCacheHits: 0
  hasResultCacheMisses: 1
  styleInvalidations: 2