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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/preferred-grandfathered.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/preferred-grandfathered.js
new file mode 100644
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/preferred-grandfathered.js
@@ -0,0 +1,98 @@
+// Copyright (C) 2017 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.getcanonicallocales
+description: >
+  Call Intl.getCanonicalLocales function with grandfathered language tags.
+info: |
+  8.2.1 Intl.getCanonicalLocales (locales)
+    1. Let ll be ? CanonicalizeLocaleList(locales).
+    2. Return CreateArrayFromList(ll).
+
+  9.2.1 CanonicalizeLocaleList (locales)
+    ...
+    7. Repeat, while k < len
+      ...
+      c. If kPresent is true, then
+        ...
+        v. Let canonicalizedTag be CanonicalizeLanguageTag(tag).
+      ...
+
+  6.2.3 CanonicalizeLanguageTag ( locale )
+    The CanonicalizeLanguageTag abstract operation returns the canonical and case-regularized form
+    of the locale argument (which must be a String value that is a structurally valid Unicode
+    BCP 47 Locale Identifier as verified by the IsStructurallyValidLanguageTag abstract operation).
+    A conforming implementation shall take the steps specified in the “BCP 47 Language Tag to
+    Unicode BCP 47 Locale Identifier” algorithm, from Unicode Technical Standard #35 LDML
+    § 3.3.1 BCP 47 Language Tag Conversion.
+
+includes: [testIntl.js]
+---*/
+
+// Generated from http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry
+// File-Date: 2017-08-15
+
+var irregularGrandfathered = [
+  "en-gb-oed",
+  "i-ami",
+  "i-bnn",
+  "i-default",
+  "i-enochian",
+  "i-hak",
+  "i-klingon",
+  "i-lux",
+  "i-mingo",
+  "i-navajo",
+  "i-pwn",
+  "i-tao",
+  "i-tay",
+  "i-tsu",
+  "sgn-be-fr",
+  "sgn-be-nl",
+  "sgn-ch-de",
+];
+
+var regularGrandfatheredNonUTS35 = [
+  "no-bok",
+  "no-nyn",
+  "zh-min",
+  "zh-min-nan",
+];
+
+var regularGrandfatheredUTS35 = {
+  "art-lojban": "jbo",
+  "cel-gaulish": "xtg",
+  "zh-guoyu": "zh",
+  "zh-hakka": "hak",
+  "zh-xiang": "hsn",
+};
+
+// make sure the data above is correct
+irregularGrandfathered.forEach(function (tag) {
+  assert.sameValue(
+    isCanonicalizedStructurallyValidLanguageTag(tag), false,
+    "Test data \"" + tag + "\" is not a structurally valid language tag."
+  );
+});
+regularGrandfatheredNonUTS35.forEach(function (tag) {
+  assert.sameValue(
+    isCanonicalizedStructurallyValidLanguageTag(tag), false,
+    "Test data \"" + tag + "\" is not a structurally valid language tag."
+  );
+});
+Object.getOwnPropertyNames(regularGrandfatheredUTS35).forEach(function (tag) {
+  var canonicalizedTag = regularGrandfatheredUTS35[tag];
+  assert(
+    isCanonicalizedStructurallyValidLanguageTag(canonicalizedTag),
+    "Test data \"" + canonicalizedTag + "\" is a canonicalized and structurally valid language tag."
+  );
+});
+
+Object.getOwnPropertyNames(regularGrandfatheredUTS35).forEach(function (tag) {
+  var canonicalLocales = Intl.getCanonicalLocales(tag);
+  assert.sameValue(canonicalLocales.length, 1);
+  assert.sameValue(canonicalLocales[0], regularGrandfatheredUTS35[tag]);
+});
+
+reportCompare(0, 0);