1 files changed, 60 insertions, 0 deletions
diff --git a/dom/html/CustomStateSet.h b/dom/html/CustomStateSet.h
new file mode 100644
index 0000000000..095974b5f4
--- /dev/null
+++ b/dom/html/CustomStateSet.h
@@ -0,0 +1,60 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_CustomStateSet_h
+#define mozilla_dom_CustomStateSet_h
+
+#include "js/TypeDecls.h"
+#include "mozilla/ErrorResult.h"
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+#include "nsCOMPtr.h"
+
+namespace mozilla::dom {
+
+class HTMLElement;
+class GlobalObject;
+
+class CustomStateSet final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(CustomStateSet)
+
+  explicit CustomStateSet(HTMLElement* aTarget);
+
+  // WebIDL interface
+  nsISupports* GetParentObject() const;
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  static MOZ_CAN_RUN_SCRIPT_BOUNDARY already_AddRefed<CustomStateSet>
+  Constructor(const GlobalObject& aGlobal, ErrorResult& aRv);
+
+  void InvalidateStyleFromCustomStateSetChange() const;
+
+  MOZ_CAN_RUN_SCRIPT void Clear(ErrorResult& aRv);
+
+  /**
+   * @brief Removes a given string from the state set.
+   */
+  MOZ_CAN_RUN_SCRIPT bool Delete(const nsAString& aState, ErrorResult& aRv);
+
+  /**
+   * @brief Adds a string to this state set.
+   */
+  MOZ_CAN_RUN_SCRIPT void Add(const nsAString& aState, ErrorResult& aRv);
+
+ private:
+  virtual ~CustomStateSet() = default;
+
+  RefPtr<HTMLElement> mTarget;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_CustomStateSet_h