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diff --git a/Source/WebCore/html/URLSearchParams.h b/Source/WebCore/html/URLSearchParams.h
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+++ b/Source/WebCore/html/URLSearchParams.h
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+/*
+ * Copyright (C) 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,
+ * 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 "DOMURL.h"
+#include <wtf/Variant.h>
+#include <wtf/Vector.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class URLSearchParams : public RefCounted<URLSearchParams> {
+public:
+    static ExceptionOr<Ref<URLSearchParams>> create(Variant<Vector<Vector<String>>, Vector<WTF::KeyValuePair<String, String>>, String>&&);
+    static Ref<URLSearchParams> create(const String& string, DOMURL* associatedURL)
+    {
+        return adoptRef(*new URLSearchParams(string, associatedURL));
+    }
+
+    void associatedURLDestroyed() { m_associatedURL = nullptr; }
+    void append(const String& name, const String& value);
+    void remove(const String& name);
+    String get(const String& name) const;
+    Vector<String> getAll(const String& name) const;
+    bool has(const String& name) const;
+    void set(const String& name, const String& value);
+    String toString() const;
+    void updateFromAssociatedURL();
+    void sort();
+
+    class Iterator {
+    public:
+        explicit Iterator(URLSearchParams&);
+        std::optional<WTF::KeyValuePair<String, String>> next();
+
+    private:
+        Ref<URLSearchParams> m_target;
+        size_t m_index { 0 };
+    };
+    Iterator createIterator() { return Iterator { *this }; }
+
+private:
+    const Vector<WTF::KeyValuePair<String, String>>& pairs() const { return m_pairs; }
+    URLSearchParams(const String&, DOMURL*);
+    URLSearchParams(const Vector<WTF::KeyValuePair<String, String>>&);
+    void updateURL();
+
+    DOMURL* m_associatedURL { nullptr };
+    Vector<WTF::KeyValuePair<String, String>> m_pairs;
+};
+
+} // namespace WebCore