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diff --git a/Source/WebCore/html/Autocapitalize.cpp b/Source/WebCore/html/Autocapitalize.cpp
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+++ b/Source/WebCore/html/Autocapitalize.cpp
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+/*
+ * Copyright (C) 2011 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.
+ */
+
+#include "config.h"
+#include "Autocapitalize.h"
+
+#include <wtf/NeverDestroyed.h>
+
+namespace WebCore {
+
+AutocapitalizeType autocapitalizeTypeForAttributeValue(const AtomicString& attributeValue)
+{
+    // Omitted / missing values are the Default state.
+    if (attributeValue.isEmpty())
+        return AutocapitalizeTypeDefault;
+
+    if (equalLettersIgnoringASCIICase(attributeValue, "on") || equalLettersIgnoringASCIICase(attributeValue, "sentences"))
+        return AutocapitalizeTypeSentences;
+    if (equalLettersIgnoringASCIICase(attributeValue, "off") || equalLettersIgnoringASCIICase(attributeValue, "none"))
+        return AutocapitalizeTypeNone;
+    if (equalLettersIgnoringASCIICase(attributeValue, "words"))
+        return AutocapitalizeTypeWords;
+    if (equalLettersIgnoringASCIICase(attributeValue, "characters"))
+        return AutocapitalizeTypeAllCharacters;
+
+    // Unrecognized values fall back to "on".
+    return AutocapitalizeTypeSentences;
+}
+
+const AtomicString& stringForAutocapitalizeType(AutocapitalizeType type)
+{
+    switch (type) {
+    case AutocapitalizeTypeDefault:
+        return nullAtom;
+    case AutocapitalizeTypeNone: {
+        static NeverDestroyed<const AtomicString> valueNone("none", AtomicString::ConstructFromLiteral);
+        return valueNone;
+    }
+    case AutocapitalizeTypeSentences: {
+        static NeverDestroyed<const AtomicString> valueSentences("sentences", AtomicString::ConstructFromLiteral);
+        return valueSentences;
+    }
+    case AutocapitalizeTypeWords: {
+        static NeverDestroyed<const AtomicString> valueWords("words", AtomicString::ConstructFromLiteral);
+        return valueWords;
+    }
+    case AutocapitalizeTypeAllCharacters: {
+        static NeverDestroyed<const AtomicString> valueAllCharacters("characters", AtomicString::ConstructFromLiteral);
+        return valueAllCharacters;
+    }
+    }
+
+    ASSERT_NOT_REACHED();
+    return nullAtom;
+}
+
+} // namespace WebCore