diff --git a/src/com/android/browser/NavScreen.java b/src/com/android/browser/NavScreen.java
index a361136..9c12ccf 100644
--- a/src/com/android/browser/NavScreen.java
+++ b/src/com/android/browser/NavScreen.java
@@ -111,6 +111,8 @@
 
     private void init() {
         LayoutInflater.from(mContext).inflate(R.layout.nav_screen, this);
+        setContentDescription(mContext.getResources().getString(
+                R.string.accessibility_transition_navscreen));
         mBookmarks = (ImageButton) findViewById(R.id.bookmarks);
         mNewTab = (ImageButton) findViewById(R.id.newtab);
         mNewIncognito = (ImageButton) findViewById(R.id.newincognito);
diff --git a/src/com/android/browser/NavigationBarPhone.java b/src/com/android/browser/NavigationBarPhone.java
index 388c262..8173377 100644
--- a/src/com/android/browser/NavigationBarPhone.java
+++ b/src/com/android/browser/NavigationBarPhone.java
@@ -40,6 +40,8 @@
     private ImageView mVoiceButton;
     private Drawable mStopDrawable;
     private Drawable mRefreshDrawable;
+    private String mStopDescription;
+    private String mRefreshDescription;
     private View mTabSwitcher;
     private View mComboIcon;
     private View mTitleContainer;
@@ -78,6 +80,8 @@
         Resources res = getContext().getResources();
         mStopDrawable = res.getDrawable(R.drawable.ic_stop_holo_dark);
         mRefreshDrawable = res.getDrawable(R.drawable.ic_refresh_holo_dark);
+        mStopDescription = res.getString(R.string.accessibility_button_stop);
+        mRefreshDescription = res.getString(R.string.accessibility_button_refresh);
         mTextfieldBgDrawable = res.getDrawable(R.drawable.textfield_active_holo_dark);
         setUaSwitcher(mComboIcon);
         mUrlInput.setContainer(this);
@@ -98,6 +102,7 @@
         super.onProgressStarted();
         if (mStopButton.getDrawable() != mStopDrawable) {
             mStopButton.setImageDrawable(mStopDrawable);
+            mStopButton.setContentDescription(mStopDescription);
             if (mStopButton.getVisibility() != View.VISIBLE) {
                 mComboIcon.setVisibility(View.GONE);
                 mStopButton.setVisibility(View.VISIBLE);
@@ -109,6 +114,7 @@
     public void onProgressStopped() {
         super.onProgressStopped();
         mStopButton.setImageDrawable(mRefreshDrawable);
+        mStopButton.setContentDescription(mRefreshDescription);
         if (!isEditingUrl()) {
             mComboIcon.setVisibility(View.VISIBLE);
         }
diff --git a/src/com/android/browser/NavigationBarTablet.java b/src/com/android/browser/NavigationBarTablet.java
index 9cb8ff2..e3059ea 100644
--- a/src/com/android/browser/NavigationBarTablet.java
+++ b/src/com/android/browser/NavigationBarTablet.java
@@ -35,6 +35,8 @@
 
     private Drawable mStopDrawable;
     private Drawable mReloadDrawable;
+    private String mStopDescription;
+    private String mRefreshDescription;
 
     private View mUrlContainer;
     private ImageButton mBackButton;
@@ -71,6 +73,8 @@
         Resources resources = context.getResources();
         mStopDrawable = resources.getDrawable(R.drawable.ic_stop_holo_dark);
         mReloadDrawable = resources.getDrawable(R.drawable.ic_refresh_holo_dark);
+        mStopDescription = resources.getString(R.string.accessibility_button_stop);
+        mRefreshDescription = resources.getString(R.string.accessibility_button_refresh);
         mFocusDrawable = resources.getDrawable(
                 R.drawable.textfield_active_holo_dark);
         mUnfocusDrawable = resources.getDrawable(
@@ -235,11 +239,13 @@
     @Override
     public void onProgressStarted() {
         mStopButton.setImageDrawable(mStopDrawable);
+        mStopButton.setContentDescription(mStopDescription);
     }
 
     @Override
     public void onProgressStopped() {
         mStopButton.setImageDrawable(mReloadDrawable);
+        mStopButton.setContentDescription(mRefreshDescription);
     }
 
     protected void updateSearchMode(boolean userEdited) {
diff --git a/src/com/android/browser/PhoneUi.java b/src/com/android/browser/PhoneUi.java
index 1c9d5a0..853d935 100644
--- a/src/com/android/browser/PhoneUi.java
+++ b/src/com/android/browser/PhoneUi.java
@@ -17,6 +17,7 @@
 package com.android.browser;
 
 import android.app.Activity;
+import android.content.Context;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.ActionMode;
@@ -25,6 +26,8 @@
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityManager;
 import android.webkit.WebView;
 import android.widget.FrameLayout;
 
@@ -250,6 +253,8 @@
         mContentView.setVisibility(View.GONE);
         mCustomViewContainer.setVisibility(View.VISIBLE);
         mCustomViewContainer.bringToFront();
+        // notify accessibility manager about the screen change
+        mNavScreen.sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
     }
 
     void hideNavScreen(boolean animate) {