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diff --git a/js/src/tests/non262/Intl/DateTimeFormat/day-period-standalone.js b/js/src/tests/non262/Intl/DateTimeFormat/day-period-standalone.js
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+++ b/js/src/tests/non262/Intl/DateTimeFormat/day-period-standalone.js
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+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// Tests using various locales to cover all day period types:
+// "midnight", "noon", "morning1", "morning2", "afternoon1", "afternoon2",
+// "evening1", "evening2", "night1", "night2".
+
+const tests = [
+  {
+      // ICU doesn't support "midnight" and instead uses "night1" resp. "night2".
+      // ICU bug: https://unicode-org.atlassian.net/projects/ICU/issues/ICU-12278
+      date: new Date("2019-01-01T00:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "nachts", short: "nachts", long: "nachts" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "夜中", short: "夜中", long: "夜中" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T03:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "nachts", short: "nachts", long: "nachts" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "夜中", short: "夜中", long: "夜中" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T04:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "nachts", short: "nachts", long: "nachts" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "朝", short: "朝", long: "朝" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T05:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "morgens", short: "morgens", long: "morgens" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "朝", short: "朝", long: "朝" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T06:00:00"),
+      locales: {
+          en: { narrow: "in the morning", short: "in the morning", long: "in the morning" },
+          de: { narrow: "morgens", short: "morgens", long: "morgens" },
+          th: { narrow: "เช้า", short: "ในตอนเช้า", long: "ในตอนเช้า" },
+          ja: { narrow: "朝", short: "朝", long: "朝" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T10:00:00"),
+      locales: {
+          en: { narrow: "in the morning", short: "in the morning", long: "in the morning" },
+          de: { narrow: "vorm.", short: "vorm.", long: "vormittags" },
+          th: { narrow: "เช้า", short: "ในตอนเช้า", long: "ในตอนเช้า" },
+          ja: { narrow: "朝", short: "朝", long: "朝" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T12:00:00"),
+      locales: {
+          en: { narrow: "n", short: "noon", long: "noon" },
+          de: { narrow: "mittags", short: "mittags", long: "mittags" },
+          th: { narrow: "เที่ยง", short: "เที่ยง", long: "เที่ยง" },
+          ja: { narrow: "正午", short: "正午", long: "正午" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T13:00:00"),
+      locales: {
+          en: { narrow: "in the afternoon", short: "in the afternoon", long: "in the afternoon" },
+          de: { narrow: "nachm.", short: "nachm.", long: "nachmittags" },
+          th: { narrow: "บ่าย", short: "บ่าย", long: "บ่าย" },
+          ja: { narrow: "昼", short: "昼", long: "昼" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T15:00:00"),
+      locales: {
+          en: { narrow: "in the afternoon", short: "in the afternoon", long: "in the afternoon" },
+          de: { narrow: "nachm.", short: "nachm.", long: "nachmittags" },
+          th: { narrow: "บ่าย", short: "บ่าย", long: "บ่าย" },
+          ja: { narrow: "昼", short: "昼", long: "昼" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T16:00:00"),
+      locales: {
+          en: { narrow: "in the afternoon", short: "in the afternoon", long: "in the afternoon" },
+          de: { narrow: "nachm.", short: "nachm.", long: "nachmittags" },
+          th: { narrow: "เย็น", short: "ในตอนเย็น", long: "ในตอนเย็น" },
+          ja: { narrow: "夕方", short: "夕方", long: "夕方" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T18:00:00"),
+      locales: {
+          en: { narrow: "in the evening", short: "in the evening", long: "in the evening" },
+          de: { narrow: "abends", short: "abends", long: "abends" },
+          th: { narrow: "ค่ำ", short: "ค่ำ", long: "ค่ำ" },
+          ja: { narrow: "夕方", short: "夕方", long: "夕方" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T19:00:00"),
+      locales: {
+          en: { narrow: "in the evening", short: "in the evening", long: "in the evening" },
+          de: { narrow: "abends", short: "abends", long: "abends" },
+          th: { narrow: "ค่ำ", short: "ค่ำ", long: "ค่ำ" },
+          ja: { narrow: "夜", short: "夜", long: "夜" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T21:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "abends", short: "abends", long: "abends" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "夜", short: "夜", long: "夜" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T22:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "abends", short: "abends", long: "abends" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "夜", short: "夜", long: "夜" },
+      }
+  },
+  {
+      date: new Date("2019-01-01T23:00:00"),
+      locales: {
+          en: { narrow: "at night", short: "at night", long: "at night" },
+          de: { narrow: "abends", short: "abends", long: "abends" },
+          th: { narrow: "กลางคืน", short: "กลางคืน", long: "กลางคืน" },
+          ja: { narrow: "夜中", short: "夜中", long: "夜中" },
+      }
+  },
+];
+
+for (let {date, locales} of tests) {
+    for (let [locale, formats] of Object.entries(locales)) {
+        for (let [dayPeriod, expected] of Object.entries(formats)) {
+            let dtf = new Intl.DateTimeFormat(locale, {dayPeriod});
+
+            assertEq(dtf.format(date), expected,
+                     `locale=${locale}, date=${date}, dayPeriod=${dayPeriod}`);
+            assertDeepEq(dtf.formatToParts(date), [{type: "dayPeriod", value: expected}]);
+        }
+    }
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, "ok");