1 files changed, 46 insertions, 0 deletions
diff --git a/dom/base/StyleSheetList.cpp b/dom/base/StyleSheetList.cpp
new file mode 100644
index 0000000000..bb49ec1005
--- /dev/null
+++ b/dom/base/StyleSheetList.cpp
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/StyleSheetList.h"
+
+#include "mozilla/dom/StyleSheetListBinding.h"
+#include "nsINode.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(StyleSheetList)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(StyleSheetList)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(StyleSheetList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(StyleSheetList)
+
+/* virtual */
+JSObject* StyleSheetList::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto) {
+  return StyleSheetList_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void StyleSheetList::NodeWillBeDestroyed(const nsINode* aNode) {
+  mDocumentOrShadowRoot = nullptr;
+}
+
+StyleSheetList::StyleSheetList(DocumentOrShadowRoot& aScope)
+    : mDocumentOrShadowRoot(&aScope) {
+  mDocumentOrShadowRoot->AsNode().AddMutationObserver(this);
+}
+
+StyleSheetList::~StyleSheetList() {
+  if (mDocumentOrShadowRoot) {
+    mDocumentOrShadowRoot->AsNode().RemoveMutationObserver(this);
+  }
+}
+
+}  // namespace mozilla::dom