1 files changed, 16 insertions, 0 deletions
diff --git a/dom/base/StaticRange.h b/dom/base/StaticRange.h
index a6f677130d..af7054f843 100644
--- a/dom/base/StaticRange.h
+++ b/dom/base/StaticRange.h
@@ -8,6 +8,7 @@
 #define mozilla_dom_StaticRange_h
 
 #include "mozilla/RangeBoundary.h"
+#include "mozilla/RangeUtils.h"
 #include "mozilla/dom/AbstractRange.h"
 #include "mozilla/dom/StaticRangeBinding.h"
 #include "nsTArray.h"
@@ -70,6 +71,21 @@ class StaticRange final : public AbstractRange {
    */
   bool IsValid() const;
 
+  void NotifyNodeBecomesShadowHost(nsINode* aNode) {
+    if (aNode == mStart.Container()) {
+      mStart.NotifyParentBecomesShadowHost();
+    }
+
+    if (aNode == mEnd.Container()) {
+      mEnd.NotifyParentBecomesShadowHost();
+    }
+  }
+
+ private:
+  // Whether the start and end points are in the same tree.
+  // They could be in different trees, i.e, cross shadow boundaries.
+  bool mAreStartAndEndInSameTree = false;
+
  protected:
   explicit StaticRange(nsINode* aNode)
       : AbstractRange(aNode, /* aIsDynamicRange = */ false) {}