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+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// CLDR contains region mappings where the replacement region depends on the
+// likely subtags from the language and script subtags.
+//
+// For example, the breakup of the Soviet Union ("SU") means that the region of
+// the Soviet Union ("SU") is replaced by Russia ("RU"), Armenia ("AM"), or
+// many others -- depending on the specified (or merely likely) language and
+// script subtags:
+//
+// <territoryAlias type="SU" replacement="RU AM AZ BY EE GE KZ KG LV LT MD TJ TM UA UZ" reason="deprecated"/>
+//
+// Armenia can be the preferred region when the language is "hy" (Armenian) or
+// the script is "Armn" (Armenian).
+//
+// <likelySubtag from="hy" to="hy_Armn_AM"/>
+// <likelySubtag from="und_Armn" to="hy_Armn_AM"/>
+assertEq(Intl.getCanonicalLocales("ru-SU")[0], "ru-RU");
+assertEq(Intl.getCanonicalLocales("en-SU")[0], "en-RU");
+assertEq(Intl.getCanonicalLocales("und-SU")[0], "und-RU");
+assertEq(Intl.getCanonicalLocales("und-Latn-SU")[0], "und-Latn-RU");
+assertEq(Intl.getCanonicalLocales("hy-SU")[0], "hy-AM");
+assertEq(Intl.getCanonicalLocales("und-Armn-SU")[0], "und-Armn-AM");
+
+// <territoryAlias type="CS" replacement="RS ME" reason="deprecated"/>
+//
+// The following likely-subtags entries contain "RS" and "ME":
+//
+// <likelySubtag from="sr" to="sr_Cyrl_RS"/>
+// <likelySubtag from="sr_ME" to="sr_Latn_ME"/>
+// <likelySubtag from="und_RS" to="sr_Cyrl_RS"/>
+// <likelySubtag from="und_ME" to="sr_Latn_ME"/>
+//
+// In this case there is no language/script combination (without a region
+// subtag) where "ME" is ever chosen, so the replacement is always "RS".
+assertEq(Intl.getCanonicalLocales("sr-CS")[0], "sr-RS");
+assertEq(Intl.getCanonicalLocales("sr-Latn-CS")[0], "sr-Latn-RS");
+assertEq(Intl.getCanonicalLocales("sr-Cyrl-CS")[0], "sr-Cyrl-RS");
+
+// The existing region in the source locale identifier is ignored when selecting
+// the likely replacement region. For example take "az-NT", which is Azerbaijani
+// spoken in the Neutral Zone. The replacement region for "NT" is either
+// "SA" (Saudi-Arabia) or "IQ" (Iraq), and there is also a likely subtags entry
+// for "az-IQ". But when only looking at the language subtag in "az-NT", "az" is
+// always resolved to "az-Latn-AZ", and because "AZ" is not in the list ["SA",
+// "IQ"], the final replacement region is the default for "NT", namely "SA".
+// That means "az-NT" will be canonicalised to "az-SA" and not "az-IQ", even
+// though the latter may be a more sensible candidate based on the actual usage
+// of the target locales.
+//
+// <territoryAlias type="NT" replacement="SA IQ" reason="deprecated"/>
+// <likelySubtag from="az_IQ" to="az_Arab_IQ"/>
+// <likelySubtag from="az" to="az_Latn_AZ"/>
+assertEq(Intl.getCanonicalLocales("az-NT")[0], "az-SA");
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);