1 files changed, 10 insertions, 0 deletions
diff --git a/layout/style/StyleRule.cpp b/layout/style/StyleRule.cpp
index 622f498dd..aca97a505 100644
--- a/layout/style/StyleRule.cpp
+++ b/layout/style/StyleRule.cpp
@@ -1078,6 +1078,16 @@ public:
     return mRule ? mRule->GetDocument() : nullptr;
   }
 
+  virtual DocGroup* GetDocGroup() const override
+  {
+    if (!mRule) {
+      return nullptr;
+    }
+
+    nsIDocument* document = mRule->GetDocument();
+    return document ? document->GetDocGroup() : nullptr;
+  }
+
   friend class css::DOMCSSStyleRule;
 
 protected: