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diff --git a/Tools/TestWebKitAPI/Tests/WebCore/CSSParser.cpp b/Tools/TestWebKitAPI/Tests/WebCore/CSSParser.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebCore/CSSParser.cpp
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+/*
+ * Copyright (C) 2014 Igalia, S.L. 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. AND ITS CONTRIBUTORS ``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 ITS 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 <WebCore/CSSParser.h>
+#include <WebCore/CSSValueList.h>
+#include <WebCore/StyleProperties.h>
+
+namespace TestWebKitAPI {
+
+using namespace WebCore;
+
+static unsigned computeNumberOfTracks(CSSValueList& valueList)
+{
+    unsigned numberOfTracks = 0;
+    for (const auto& value : valueList) {
+        if (value->isGridLineNamesValue())
+            continue;
+        ++numberOfTracks;
+    }
+    return numberOfTracks;
+}
+
+TEST(CSSPropertyParserTest, GridTrackLimits)
+{
+    struct {
+        const CSSPropertyID propertyID;
+        const char* input;
+        const size_t output;
+    } testCases[] = {
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(999999, 20px);", 999999},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(999999, 20px);", 999999},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(1000000, 10%);", 1000000},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(1000000, 10%);", 1000000},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(1000000, [first] -webkit-min-content [last]);", 1000000},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(1000000, [first] -webkit-min-content [last]);", 1000000},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(1000001, auto);", 1000000},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(1000001, auto);", 1000000},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(400000, 2em minmax(10px, -webkit-max-content) 0.5fr);", 999999},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(400000, 2em minmax(10px, -webkit-max-content) 0.5fr);", 999999},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(600000, [first] 3vh 10% 2fr [nav] 10px auto 1fr 6em [last]);", 999999},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(600000, [first] 3vh 10% 2fr [nav] 10px auto 1fr 6em [last]);", 999999},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(100000000000000000000, 10% 1fr);", 1000000},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(100000000000000000000, 10% 1fr);", 1000000},
+        {CSSPropertyGridTemplateColumns, "grid-template-columns: repeat(100000000000000000000, 10% 5em 1fr auto auto 15px -webkit-min-content);", 999999},
+        {CSSPropertyGridTemplateRows, "grid-template-rows: repeat(100000000000000000000, 10% 5em 1fr auto auto 15px -webkit-min-content);", 999999},
+    };
+
+    CSSParser parser(strictCSSParserContext());
+    auto properties = MutableStyleProperties::create();
+
+    for (auto& testCase : testCases) {
+        ASSERT_TRUE(parser.parseDeclaration(properties, testCase.input));
+        RefPtr<CSSValue> value = properties->getPropertyCSSValue(testCase.propertyID);
+
+        ASSERT_TRUE(value->isValueList());
+        EXPECT_EQ(computeNumberOfTracks(*downcast<CSSValueList>(value.get())), testCase.output);
+    }
+}
+
+} // namespace TestWebKitAPI