PseudoOptional    218 Source/core/css/CSSSelector.cpp     case PseudoOptional:
PseudoOptional    316 Source/core/css/CSSSelector.cpp {"optional",                      CSSSelector::PseudoOptional},
PseudoOptional    490 Source/core/css/CSSSelector.cpp     case PseudoOptional:
PseudoOptional     85 Source/core/css/RuleFeature.cpp     case CSSSelector::PseudoOptional:
PseudoOptional    817 Source/core/css/SelectorChecker.cpp         case CSSSelector::PseudoOptional: