UnknownFilterOperation  842 Source/core/css/CSSComputedStyleDeclaration.cpp             filterValue = CSSFilterValue::create(CSSFilterValue::UnknownFilterOperation);
UnknownFilterOperation 7357 Source/core/css/parser/CSSPropertyParser.cpp         CSSFilterValue::FilterOperationType filterType = CSSFilterValue::UnknownFilterOperation;
UnknownFilterOperation 7370 Source/core/css/parser/CSSPropertyParser.cpp             if (filterType == CSSFilterValue::UnknownFilterOperation)
UnknownFilterOperation   67 Source/core/css/resolver/FilterOperationResolver.cpp     case CSSFilterValue::UnknownFilterOperation:
UnknownFilterOperation  202 Source/core/css/resolver/FilterOperationResolver.cpp         case CSSFilterValue::UnknownFilterOperation: