isHeaderElement   454 Source/core/editing/ReplaceSelectionCommand.cpp            (!isHeaderElement(sourceBlock) || haveSameTagName(sourceBlock, destinationBlock)) &&
isHeaderElement   627 Source/core/editing/ReplaceSelectionCommand.cpp         if (isHeaderElement(node.get())) {
isHeaderElement   628 Source/core/editing/ReplaceSelectionCommand.cpp             if (HTMLElement* headerElement = toHTMLElement(highestEnclosingNodeOfType(positionInParentBeforeNode(*node), isHeaderElement)))