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diff --git a/Source/WebCore/css/MediaQuery.cpp b/Source/WebCore/css/MediaQuery.cpp
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+/*
+ * CSS Media Query
+ *
+ * Copyright (C) 2005, 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * 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 THE AUTHOR ``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 COMPUTER, 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. 
+ */
+
+#include "config.h"
+#include "MediaQuery.h"
+
+#include "MediaQueryExp.h"
+#include <wtf/NonCopyingSort.h>
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+// http://dev.w3.org/csswg/cssom/#serialize-a-media-query
+String MediaQuery::serialize() const
+{
+    StringBuilder result;
+
+    switch (m_restrictor) {
+    case MediaQuery::Only:
+        result.append("only ");
+        break;
+    case MediaQuery::Not:
+        result.append("not ");
+        break;
+    case MediaQuery::None:
+        break;
+    }
+
+    if (m_expressions->isEmpty()) {
+        result.append(m_mediaType);
+        return result.toString();
+    }
+
+    if (m_mediaType != "all" || m_restrictor != None) {
+        result.append(m_mediaType);
+        result.append(" and ");
+    }
+
+    result.append(m_expressions->at(0)->serialize());
+    for (size_t i = 1; i < m_expressions->size(); ++i) {
+        result.append(" and ");
+        result.append(m_expressions->at(i)->serialize());
+    }
+    return result.toString();
+}
+
+static bool expressionCompare(const OwnPtr<MediaQueryExp>& a, const OwnPtr<MediaQueryExp>& b) 
+{
+    return codePointCompare(a->serialize(), b->serialize()) < 0;
+}
+
+
+MediaQuery::MediaQuery(Restrictor r, const String& mediaType, PassOwnPtr<Vector<OwnPtr<MediaQueryExp> > > exprs)
+    : m_restrictor(r)
+    , m_mediaType(mediaType.lower())
+    , m_expressions(exprs)
+    , m_ignored(false)
+{
+    if (!m_expressions) {
+        m_expressions = adoptPtr(new Vector<OwnPtr<MediaQueryExp> >);
+        return;
+    }
+
+    nonCopyingSort(m_expressions->begin(), m_expressions->end(), expressionCompare);
+
+    // remove all duplicated expressions
+    String key;
+    for (int i = m_expressions->size() - 1; i >= 0; --i) {
+
+        // if not all of the expressions is valid the media query must be ignored.
+        if (!m_ignored)
+            m_ignored = !m_expressions->at(i)->isValid();
+ 
+        if (m_expressions->at(i)->serialize() == key)
+            m_expressions->remove(i);
+        else
+            key = m_expressions->at(i)->serialize();
+    }
+}
+
+MediaQuery::~MediaQuery()
+{
+}
+
+// http://dev.w3.org/csswg/cssom/#compare-media-queries
+bool MediaQuery::operator==(const MediaQuery& other) const
+{
+    return cssText() == other.cssText();
+}
+
+// http://dev.w3.org/csswg/cssom/#serialize-a-list-of-media-queries
+String MediaQuery::cssText() const
+{
+    if (m_serializationCache.isNull())
+        const_cast<MediaQuery*>(this)->m_serializationCache = serialize();
+
+    return m_serializationCache;
+}
+
+} //namespace