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diff --git a/Source/WebCore/css/FontFace.h b/Source/WebCore/css/FontFace.h
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+++ b/Source/WebCore/css/FontFace.h
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+/*
+ * Copyright (C) 2007, 2008, 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "CSSFontFace.h"
+#include "CSSPropertyNames.h"
+#include "JSDOMPromise.h"
+#include <wtf/Variant.h>
+#include <wtf/WeakPtr.h>
+
+namespace JSC {
+class ArrayBuffer;
+class ArrayBufferView;
+}
+
+namespace WebCore {
+
+class FontFace final : public RefCounted<FontFace>, private CSSFontFace::Client {
+public:
+    struct Descriptors {
+        String style;
+        String weight;
+        String stretch;
+        String unicodeRange;
+        String variant;
+        String featureSettings;
+    };
+    
+    using Source = Variant<String, RefPtr<JSC::ArrayBuffer>, RefPtr<JSC::ArrayBufferView>>;
+    static ExceptionOr<Ref<FontFace>> create(Document&, const String& family, Source&&, const Descriptors&);
+    static Ref<FontFace> create(CSSFontFace&);
+    virtual ~FontFace();
+
+    ExceptionOr<void> setFamily(const String&);
+    ExceptionOr<void> setStyle(const String&);
+    ExceptionOr<void> setWeight(const String&);
+    ExceptionOr<void> setStretch(const String&);
+    ExceptionOr<void> setUnicodeRange(const String&);
+    ExceptionOr<void> setVariant(const String&);
+    ExceptionOr<void> setFeatureSettings(const String&);
+
+    String family() const;
+    String style() const;
+    String weight() const;
+    String stretch() const;
+    String unicodeRange() const;
+    String variant() const;
+    String featureSettings() const;
+
+    enum class LoadStatus { Unloaded, Loading, Loaded, Error };
+    LoadStatus status() const;
+
+    using Promise = DOMPromise<IDLInterface<FontFace>>;
+    std::optional<Promise>& promise() { return m_promise; }
+    void registerLoaded(Promise&&);
+
+    void adopt(CSSFontFace&);
+
+    void load();
+
+    CSSFontFace& backing() { return m_backing; }
+
+    static RefPtr<CSSValue> parseString(const String&, CSSPropertyID);
+
+    void fontStateChanged(CSSFontFace&, CSSFontFace::Status oldState, CSSFontFace::Status newState) final;
+
+    WeakPtr<FontFace> createWeakPtr() const;
+
+    void ref() final { RefCounted::ref(); }
+    void deref() final { RefCounted::deref(); }
+
+private:
+    explicit FontFace(CSSFontSelector&);
+    explicit FontFace(CSSFontFace&);
+
+    WeakPtrFactory<FontFace> m_weakPtrFactory;
+    Ref<CSSFontFace> m_backing;
+    std::optional<Promise> m_promise;
+};
+
+}