1 files changed, 54 insertions, 0 deletions
diff --git a/layout/style/CSSValue.h b/layout/style/CSSValue.h
new file mode 100644
index 0000000000..15d385f2a8
--- /dev/null
+++ b/layout/style/CSSValue.h
@@ -0,0 +1,54 @@
+/* -*- 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/. */
+
+/* DOM object representing values in DOM computed style */
+
+#ifndef mozilla_dom_CSSValue_h_
+#define mozilla_dom_CSSValue_h_
+
+#include "nsStringFwd.h"
+#include "mozilla/RefCounted.h"
+
+class nsROCSSPrimitiveValue;
+namespace mozilla {
+class ErrorResult;
+}  // namespace mozilla
+
+namespace mozilla::dom {
+
+/**
+ * CSSValue - a DOM object representing values in DOM computed style.
+ */
+class CSSValue : public RefCounted<CSSValue> {
+ public:
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(CSSValue);
+  enum : uint16_t {
+    CSS_INHERIT,
+    CSS_PRIMITIVE_VALUE,
+    CSS_VALUE_LIST,
+    CSS_CUSTOM,
+  };
+
+  // CSSValue
+  virtual void GetCssText(nsString& aText, ErrorResult& aRv) = 0;
+  virtual uint16_t CssValueType() const = 0;
+
+  virtual ~CSSValue() = default;
+
+  // Downcasting
+
+  /**
+   * Return this as a nsROCSSPrimitiveValue* if its a primitive value, and null
+   * otherwise.
+   *
+   * Defined in nsROCSSPrimitiveValue.h.
+   */
+  inline nsROCSSPrimitiveValue* AsPrimitiveValue();
+};
+
+}  // namespace mozilla::dom
+
+#endif