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diff --git a/js/src/tests/test262/intl402/language-tags-canonicalized.js b/js/src/tests/test262/intl402/language-tags-canonicalized.js
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+++ b/js/src/tests/test262/intl402/language-tags-canonicalized.js
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+// Copyright 2011-2012 Norbert Lindenberg. All rights reserved.
+// Copyright 2012  Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 6.2.3
+description: Tests that language tags are canonicalized in return values.
+author: Norbert Lindenberg
+includes: [testIntl.js]
+---*/
+
+var canonicalizedTags = {
+    "de": ["de"],
+    "de-DE": ["de-DE", "de"],
+    "DE-de": ["de-DE", "de"],
+    "cmn": ["zh"],
+    "CMN-hANS": ["zh-Hans", "zh"],
+    "cmn-hans-cn": ["zh-Hans-CN", "zh-Hans", "zh"],
+    "es-419": ["es-419", "es"],
+    "es-419-u-nu-latn": ["es-419-u-nu-latn", "es-419", "es", "es-u-nu-latn"],
+    // -u-ca is incomplete, so it will not show up in resolvedOptions().locale
+    "cmn-hans-cn-u-ca-t-ca-x-t-u": ["zh-Hans-CN-t-ca-u-ca-x-t-u", "zh-Hans-CN-t-ca-x-t-u", "zh-Hans-CN-t-ca-x-t", "zh-Hans-CN-t-ca", "zh-Hans-CN", "zh-Hans", "zh"],
+    "de-gregory-u-ca-gregory": ["de-gregory-u-ca-gregory", "de-gregory", "de-u-ca-gregory", "de"],
+    "sgn-GR": ["gss"],
+    "ji": ["yi"],
+    "de-DD": ["de-DE", "de"],
+    "in": ["id"],
+};
+
+// make sure the data above is correct
+Object.getOwnPropertyNames(canonicalizedTags).forEach(function (tag) {
+    canonicalizedTags[tag].forEach(function (canonicalTag) {
+        assert(isCanonicalizedStructurallyValidLanguageTag(canonicalTag), "Test data \"" + canonicalTag + "\" is not canonicalized and structurally valid language tag.");
+    });
+});
+
+// now the actual test
+testWithIntlConstructors(function (Constructor) {
+    var defaultLocale = new Constructor().resolvedOptions().locale;
+    Object.getOwnPropertyNames(canonicalizedTags).forEach(function (tag) {
+        // use lookup locale matcher to keep the set of possible return values predictable
+
+        // Variant 1: construct an object and see whether its locale is canonicalized.
+        // In this variant, shortened forms or the default locale may be returned
+        var object = new Constructor([tag], { localeMatcher: "lookup" });
+        var locale = object.resolvedOptions().locale;
+        assert(canonicalizedTags[tag].indexOf(locale) !== -1 || locale === defaultLocale, "For " + tag + " got " + locale + "; expected one of " + canonicalizedTags[tag].join(", ") + ".");
+        
+        // Variant 2: get the supported locales. If the tag is supported, it should be returned canonicalized but unshortened
+        var supported = Constructor.supportedLocalesOf([tag]);
+        assert(supported.length === 0 || supported[0] === canonicalizedTags[tag][0], "For " + tag + " got " + supported[0] + "; expected " + canonicalizedTags[tag][0] + ".");
+    });
+});
+
+reportCompare(0, 0);