Check isUserActionElement() instead of separate hover/active/focus checks in supportsStyleSharing()

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index a535573a04cb930f955c0a3b3e8a4b2c51316098..dd8fbb6e39be4ed668ddf038f34f257861cd9ee1 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -3318,13 +3318,10 @@ bool Element::supportsStyleSharing() const
     // Ids stop style sharing if they show up in the stylesheets.
     if (hasID() && document().ensureStyleResolver().hasRulesForId(idForStyleResolution()))
         return false;
-    // Active and hovered elements always make a chain towards the document node
-    // and no siblings or cousins will have the same state.
-    if (hovered())
-        return false;
-    if (active())
-        return false;
-    if (focused())
+    // :active and :hover elements always make a chain towards the document node
+    // and no siblings or cousins will have the same state. There's also only one
+    // :focus element per scope so we don't need to attempt to share.
+    if (isUserActionElement())
         return false;
     if (!parentOrShadowHostElement()->childrenSupportStyleSharing())
         return false;