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third_party/polymer/components/paper-input/paper-input-behavior.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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@@ skipping 428 matching lines @@
      * @return {boolean}
      */
     validate: function() {
       return this.inputElement.validate();
     },
 
     /**
      * Forward focus to inputElement. Overriden from IronControlState.
      */
     _focusBlurHandler: function(event) {
-      if (this._shiftTabPressed)
-        return;
-
       Polymer.IronControlState._focusBlurHandler.call(this, event);
 
       // Forward the focus to the nested input.
-      if (this.focused)
+      if (this.focused && !this._shiftTabPressed)
         this._focusableElement.focus();
     },
 
     /**
      * Handler that is called when a shift+tab keypress is detected by the menu.
      *
      * @param {CustomEvent} event A key combination event.
      */
     _onShiftTabDown: function(event) {
       var oldTabIndex = this.getAttribute('tabindex');
@@ skipping 69 matching lines @@
     }
   }
 
   /** @polymerBehavior */
   Polymer.PaperInputBehavior = [
     Polymer.IronControlState,
     Polymer.IronA11yKeysBehavior,
     Polymer.PaperInputBehaviorImpl
   ];
 </script>