For non-editable content, selection editor commands are disabled

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 756 matching lines @@
     m_capturesDragging = false;
     m_mouseDownMayStartDrag = false;
     m_mouseDownMayStartSelect = false;
     m_mouseDownMayStartAutoscroll = false;
     m_mouseDownWasInSubframe = false;
 
     bool handled = false;
 
     // Clear the selection if the mouse didn't move after the last mouse
     // press and it's not a context menu click.  We do this so when clicking
-    // on the selection, the selection goes away.  However, if we are
-    // editing, place the caret.
+    // on the selection, the selection goes away. For readonly texts
+    // we do need to know the position of the caret for any selection
+    // using keyboard shortcuts as its currently working in non-webkit
+    // based browsers for ex: firefox. Therefore, place the caret even
+    // for non-editable texts.
     if (m_mouseDownWasSingleClickInSelection && m_selectionInitiationState != ExtendedSelection
             && m_dragStartPos == event.event().position()
             && m_frame->selection().isRange()
             && event.event().button() != RightButton) {
         VisibleSelection newSelection;
         Node* node = event.targetNode();
-        bool caretBrowsing = m_frame->settings() && m_frame->settings()->caretBrowsingEnabled();
-        if (node && node->renderer() && (caretBrowsing || node->hasEditableStyle())) {
+        if (node && node->renderer()) {
             VisiblePosition pos = VisiblePosition(node->renderer()->positionForPoint(event.localPoint()));
             newSelection = VisibleSelection(pos);
         }
 
         setSelectionIfNeeded(m_frame->selection(), newSelection);
 
         handled = true;
     }
 
     m_frame->selection().notifyRendererOfSelectionChange(UserTriggered);
@@ skipping 3023 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore