Handling of different types of empty alt

content/renderer/accessibility/blink_ax_tree_source.cc

 // 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.
 
 #include "content/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 387 matching lines @@
     dst->transform = base::WrapUnique(new gfx::Transform(container_transform));
   if (!offset_container.IsDetached())
     dst->offset_container_id = offset_container.AxID();
 
   AXContentNodeDataSparseAttributeAdapter sparse_attribute_adapter(dst);
   src.GetSparseAXAttributes(sparse_attribute_adapter);
 
   blink::WebAXNameFrom nameFrom;
   blink::WebVector<blink::WebAXObject> nameObjects;
   blink::WebString web_name = src.GetName(nameFrom, nameObjects);
-  if (!web_name.IsEmpty()) {
+  if ((!web_name.IsEmpty() && !web_name.IsNull()) ||
+      nameFrom == blink::kWebAXNameFromAttributeExplicitlyEmpty) {
     dst->AddStringAttribute(ui::AX_ATTR_NAME, web_name.Utf8());
     dst->AddIntAttribute(ui::AX_ATTR_NAME_FROM, AXNameFromFromBlink(nameFrom));
     AddIntListAttributeFromWebObjects(
         ui::AX_ATTR_LABELLEDBY_IDS, nameObjects, dst);
   }
 
   blink::WebAXDescriptionFrom descriptionFrom;
   blink::WebVector<blink::WebAXObject> descriptionObjects;
   blink::WebString web_description =
       src.Description(nameFrom, descriptionFrom, descriptionObjects);
@@ skipping 470 matching lines @@
     return WebAXObject();
 
   WebDocument document = render_frame_->GetWebFrame()->GetDocument();
   if (!document.IsNull())
     return document.AccessibilityObject();
 
   return WebAXObject();
 }
 
 }  // namespace content