SkipDirection     516 Source/core/html/HTMLSelectElement.cpp int HTMLSelectElement::nextValidIndex(int listIndex, SkipDirection direction, int skip) const
SkipDirection     560 Source/core/html/HTMLSelectElement.cpp int HTMLSelectElement::nextSelectableListIndexPageAway(int startIndex, SkipDirection direction) const
SkipDirection     183 Source/core/html/HTMLSelectElement.h     int nextValidIndex(int listIndex, SkipDirection, int skip) const;
SkipDirection     188 Source/core/html/HTMLSelectElement.h     int nextSelectableListIndexPageAway(int startIndex, SkipDirection) const;