querySelector     917 Source/core/dom/ContainerNode.cpp PassRefPtr<Element> ContainerNode::querySelector(const AtomicString& selectors, ExceptionState& exceptionState)
querySelector     587 Source/core/inspector/InspectorDOMAgent.cpp void InspectorDOMAgent::querySelector(ErrorString* errorString, int nodeId, const String& selectors, int* elementId)
querySelector     203 Source/web/WebNode.cpp WebElement WebNode::querySelector(const WebString& tag, WebExceptionCode& ec) const