If an element A has a parent element, then A's assigned context menu is the assigned context menu o…

Source/core/html/HTMLElement.cpp

Index: Source/core/html/HTMLElement.cpp
diff --git a/Source/core/html/HTMLElement.cpp b/Source/core/html/HTMLElement.cpp
index 59e0cba45f063250b31e2a2163e13c282a11bf59..8eb8c19b2410213c17b090ca9e38f3d5d6fed2ce 100644
--- a/Source/core/html/HTMLElement.cpp
+++ b/Source/core/html/HTMLElement.cpp
@@ -934,6 +934,13 @@ bool HTMLElement::isInteractiveContent() const
     return false;
 }
 
+HTMLMenuElement* HTMLElement::assignedContextMenu() const
+{
+    if (HTMLMenuElement* menu = contextMenu())
+        return menu;
+
+    return parentElement() && parentElement()->isHTMLElement() ? toHTMLElement(parentElement())->assignedContextMenu() : nullptr;
+}
 
 HTMLMenuElement* HTMLElement::contextMenu() const
 {