Don't set sequential focus for offscreen nodes

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 813 matching lines @@
         if (!ancestor.state.focused)
           ancestor.focus();
         return;
       }
       ancestor = ancestor.parent;
     }
 
     // If nothing is focusable, set the sequential focus navigation starting
     // point, which ensures that the next time you press Tab, you'll reach
     // the next or previous focusable node from |start|.
-    start.setSequentialFocusNavigationStartingPoint();
+    if (!start.state.offscreen)
+      start.setSequentialFocusNavigationStartingPoint();
   }
 };
 
 /**
  * Converts a list of globs, as used in the extension manifest, to a regular
  * expression that matches if and only if any of the globs in the list matches.
  * @param {!Array<string>} globs
  * @return {!RegExp}
  * @private
  */
 Background.globsToRegExp_ = function(globs) {
   return new RegExp('^(' + globs.map(function(glob) {
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 new Background();
 
 });  // goog.scope