Use Shadow DOM to display fallback content for images

Source/core/accessibility/AXRenderObject.cpp

Index: Source/core/accessibility/AXRenderObject.cpp
diff --git a/Source/core/accessibility/AXRenderObject.cpp b/Source/core/accessibility/AXRenderObject.cpp
index e747c56d2953741908cd7aa966acd576f6d55b27..c7894c45485ba3f6c7edd1b3cd770dc80420e0f6 100644
--- a/Source/core/accessibility/AXRenderObject.cpp
+++ b/Source/core/accessibility/AXRenderObject.cpp
@@ -289,6 +289,12 @@ AccessibilityRole AXRenderObject::determineAccessibilityRole()
         return ImageRole;
     }
 
+    // This is for the case where the fallback content kicks in.
+    // The normal case should be handled in the case above
+    if (node && node->hasTagName(HTMLNames::imgTag)) {
+        return ImageRole;
+    }

[esprehn, 2014/09/05 00:47:50]

no braces

[rhogan, 2014/09/08 19:52:41]

Done

+
     // Note: if JavaScript is disabled, the renderer won't be a RenderHTMLCanvas.
     if (isHTMLCanvasElement(node) && m_renderer->isCanvas())
         return CanvasRole;