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diff --git a/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-language-mappings.js b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-language-mappings.js
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+++ b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-language-mappings.js
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+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// For the most part the mappings from IANA are a subset of the CLDR mappings.
+// So there are mappings which are consistent across both databases.
+assertEq(Intl.getCanonicalLocales("iw")[0], "he");
+
+// But some languages are mapped differently.
+//
+// From the IANA language data registry:
+//   Type: language
+//   Subtag: drh
+//   Description: Darkhat
+//   Added: 2009-07-29
+//   Deprecated: 2010-03-11
+//   Preferred-Value: khk
+//
+// From CLDR:
+//   <languageAlias type="drh" replacement="mn" reason="deprecated"/>
+//
+// because CLDR also maps macro-languages:
+//   <languageAlias type="khk" replacement="mn" reason="macrolanguage"/>
+assertEq(Intl.getCanonicalLocales("drh")[0], "mn");
+
+// CLDR maps macro-languages:
+//   <languageAlias type="cmn" replacement="zh" reason="macrolanguage"/>
+assertEq(Intl.getCanonicalLocales("cmn")[0], "zh");
+
+// CLDR also contains mappings from ISO-639-2 (B/T) to 639-1 codes:
+//   <languageAlias type="dut" replacement="nl" reason="bibliographic"/>
+//   <languageAlias type="nld" replacement="nl" reason="overlong"/>
+assertEq(Intl.getCanonicalLocales("dut")[0], "nl");
+assertEq(Intl.getCanonicalLocales("nld")[0], "nl");
+
+// CLDR has additional mappings for legacy language codes.
+//   <languageAlias type="no" replacement="nb" reason="legacy"/>
+assertEq(Intl.getCanonicalLocales("no")[0], "nb");
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);