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third_party/polymer/components/iron-behaviors/iron-control-state.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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     _focusBlurHandler: function(event) {
       // NOTE(cdata):  if we are in ShadowDOM land, `event.target` will
       // eventually become `this` due to retargeting; if we are not in
       // ShadowDOM land, `event.target` will eventually become `this` due
       // to the second conditional which fires a synthetic event (that is also
       // handled). In either case, we can disregard `event.path`.
 
       if (event.target === this) {
         this._setFocused(event.type === 'focus');
-      } else if (!this.shadowRoot && !this.isLightDescendant(event.target)) {
-        this.fire(event.type, {sourceEvent: event}, {
-          node: this,
-          bubbles: event.bubbles,
-          cancelable: event.cancelable
-        });
+      } else if (!this.shadowRoot) {
+        var target = /** @type {Node} */(Polymer.dom(event).localTarget);
+        if (!this.isLightDescendant(target)) {
+          this.fire(event.type, {sourceEvent: event}, {
+            node: this,
+            bubbles: event.bubbles,
+            cancelable: event.cancelable
+          });
+        }
       }
     },
 
     _disabledChanged: function(disabled, old) {
       this.setAttribute('aria-disabled', disabled ? 'true' : 'false');
       this.style.pointerEvents = disabled ? 'none' : '';
       if (disabled) {
         this._oldTabIndex = this.tabIndex;
         this._setFocused(false);
         this.tabIndex = -1;
         this.blur();
       } else if (this._oldTabIndex !== undefined) {
         this.tabIndex = this._oldTabIndex;
       }
     },
 
     _changedControlState: function() {
       // _controlStateChanged is abstract, follow-on behaviors may implement it
       if (this._controlStateChanged) {
         this._controlStateChanged();
       }
     }
 
   };
 
 </script>