ChromeVox shouldn't update its active range for an alert event.

chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 60 matching lines @@
   for (var func in this) {
     if (typeof(this[func]) == 'function')
       this[func] = this[func].bind(this);
   }
 
   /**
    * Maps an automation event to its listener.
    * @type {!Object<EventType, function(Object) : void>}
    */
   this.listeners_ = {
-    alert: this.onEventDefault,
+    alert: this.onAlert,
     focus: this.onFocus,
     hover: this.onEventDefault,
     loadComplete: this.onLoadComplete,
     menuStart: this.onEventDefault,
     menuEnd: this.onEventDefault,
     textChanged: this.onTextOrTextSelectionChanged,
     textSelectionChanged: this.onTextOrTextSelectionChanged,
     valueChanged: this.onValueChanged
   };
 
@@ skipping 355 matching lines @@
         evt.type == 'focus' &&
         this.currentRange_.equals(prevRange))
       return;
 
     new Output().withSpeechAndBraille(
             this.currentRange_, prevRange, evt.type)
         .go();
   },
 
   /**
+   * Makes an announcement without changing focus.
+   * @param {Object} evt
+   */
+  onAlert: function(evt) {
+    var node = evt.target;
+    if (!node)
+      return;
+
+    // Don't process nodes inside of web content if ChromeVox Next is inactive.
+    if (node.root.role != RoleType.desktop &&
+        this.mode_ === ChromeVoxMode.CLASSIC) {
+      return;
+    }
+
+    var range = cursors.Range.fromNode(node);
+
+    new Output().withSpeechAndBraille(range, null, evt.type).go();
+  },
+
+  /**
    * Provides all feedback once a focus event fires.
    * @param {Object} evt
    */
   onFocus: function(evt) {
     // Invalidate any previous editable text handler state.
     this.editableTextHandler = null;
 
     var node = evt.target;
 
     // It almost never makes sense to place focus directly on a rootWebArea.
@@ skipping 303 matching lines @@
               node.state.protected,
               cvox.ChromeVox.tts);
     }
   }
 };
 
 /** @type {Background} */
 global.backgroundObj = new Background();
 
 });  // goog.scope