Selection follows focus/activedescendant in single selection containers

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

Index: third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
index c50a0bd5fe58a5002fb9ce0c5dd8b0e03c353906..ae82be562a3fabcf24a200ba5c6734bef3c69673 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
@@ -1294,11 +1294,13 @@ bool AXNodeObject::CanSetValueAttribute() const {
 }
 
 bool AXNodeObject::CanSetSelectedAttribute() const {
-  // ARIA list box options can be selected if they are children of an element
-  // with an aria-activedescendant attribute.
-  if (AriaRoleAttribute() == kListBoxOptionRole &&
-      AncestorExposesActiveDescendant())
+  const AccessibilityRole role = AriaRoleAttribute();
+  // These elements can be selected if not disabled (native or ARIA)
+  if ((role == kListBoxOptionRole || role == kTreeItemRole ||
+       role == kCellRole || role == kTabRole) &&
+      IsEnabled()) {

[dmazzoni, 2017/05/19 19:54:04]

Do we need to check if the container is enabled or does
IsEnabled do that?

     return true;
+  }
   return AXObjectImpl::CanSetSelectedAttribute();
 }