TabIndexWasSetExplicitly  377 Source/core/dom/Element.h     virtual bool supportsFocus() const { return hasElementFlag(TabIndexWasSetExplicitly); }
TabIndexWasSetExplicitly   57 Source/core/dom/ElementRareData.h         setElementFlag(TabIndexWasSetExplicitly, true);
TabIndexWasSetExplicitly   63 Source/core/dom/ElementRareData.h         clearElementFlag(TabIndexWasSetExplicitly);