Added support for header and footer inside other sections, according to HTML API Mappings 1.0.

third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 476 matching lines @@
         return IgnoredRole;
 
     if (isHTMLIFrameElement(*getNode())) {
         const AtomicString& ariaRole = getAttribute(roleAttr);
         if (ariaRole == "none" || ariaRole == "presentation")
             return IframePresentationalRole;
         return IframeRole;
     }
 
     // There should only be one banner/contentInfo per page. If header/footer are being used within an article or section
-    // then it should not be exposed as whole page's banner/contentInfo
-    if (getNode()->hasTagName(headerTag) && !isDescendantOfElementType(articleTag) && !isDescendantOfElementType(sectionTag))
+    // then it should not be exposed as whole page's banner/contentInfo but as a group role.
+    if (getNode()->hasTagName(headerTag)) {
+        if (isDescendantOfElementType(articleTag) || isDescendantOfElementType(sectionTag)
+            || (getNode()->parentElement() && getNode()->parentElement()->hasTagName(mainTag))) {
+            return GroupRole;
+        }
         return BannerRole;
+    }
 
-    if (getNode()->hasTagName(footerTag) && !isDescendantOfElementType(articleTag) && !isDescendantOfElementType(sectionTag))
+    if (getNode()->hasTagName(footerTag)) {
+        if (isDescendantOfElementType(articleTag) || isDescendantOfElementType(sectionTag)
+            || (getNode()->parentElement() && getNode()->parentElement()->hasTagName(mainTag))) {
+            return GroupRole;
+        }
         return FooterRole;
+    }
 
     if (getNode()->hasTagName(blockquoteTag))
         return BlockquoteRole;
 
     if (getNode()->hasTagName(captionTag))
         return CaptionRole;
 
     if (getNode()->hasTagName(figcaptionTag))
         return FigcaptionRole;
 
@@ skipping 2407 matching lines @@
     return placeholder;
 }
 
 DEFINE_TRACE(AXNodeObject)
 {
     visitor->trace(m_node);
     AXObject::trace(visitor);
 }
 
 } // namespace blink