TableCaptionElement is not exposed to accessibility

content/browser/accessibility/browser_accessibility_win.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/accessibility/browser_accessibility_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 3417 matching lines @@
       ia_role_ = ROLE_SYSTEM_PUSHBUTTON;
       break;
     case ui::AX_ROLE_CANVAS:
       if (GetBoolAttribute(ui::AX_ATTR_CANVAS_HAS_FALLBACK)) {
         role_name_ = L"canvas";
         ia2_role_ = IA2_ROLE_CANVAS;
       } else {
         ia_role_ = ROLE_SYSTEM_GRAPHIC;
       }
       break;
+    case ui::AX_ROLE_CAPTION:
+      ia_role_ = ROLE_SYSTEM_TEXT;
+      ia2_role_ = IA2_ROLE_CAPTION;
+      break;
     case ui::AX_ROLE_CELL:
       ia_role_ = ROLE_SYSTEM_CELL;
       break;
     case ui::AX_ROLE_CHECK_BOX:
       ia_role_ = ROLE_SYSTEM_CHECKBUTTON;
       ia2_state_ |= IA2_STATE_CHECKABLE;
       break;
     case ui::AX_ROLE_COLOR_WELL:
       ia_role_ = ROLE_SYSTEM_TEXT;
       ia2_role_ = IA2_ROLE_COLOR_CHOOSER;
@@ skipping 395 matching lines @@
   // The role should always be set.
   DCHECK(!role_name_.empty() || ia_role_);
 
   // If we didn't explicitly set the IAccessible2 role, make it the same
   // as the MSAA role.
   if (!ia2_role_)
     ia2_role_ = ia_role_;
 }
 
 }  // namespace content