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diff --git a/js/src/builtin/intl/IntlObject.js b/js/src/builtin/intl/IntlObject.js
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+++ b/js/src/builtin/intl/IntlObject.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * 8.2.1 Intl.getCanonicalLocales ( locales )
+ *
+ * ES2017 Intl draft rev 947aa9a0c853422824a0c9510d8f09be3eb416b9
+ */
+function Intl_getCanonicalLocales(locales) {
+  // Steps 1-2.
+  return CanonicalizeLocaleList(locales);
+}
+
+/**
+ * Intl.supportedValuesOf ( key )
+ */
+function Intl_supportedValuesOf(key) {
+  // Step 1.
+  key = ToString(key);
+
+  // Steps 2-9.
+  return intl_SupportedValuesOf(key);
+}
+
+/**
+ * This function is a custom function in the style of the standard Intl.*
+ * functions, that isn't part of any spec or proposal yet.
+ *
+ * Returns an object with the following properties:
+ *   locale:
+ *     The actual resolved locale.
+ *
+ *   calendar:
+ *     The default calendar of the resolved locale.
+ *
+ *   firstDayOfWeek:
+ *     The first day of the week for the resolved locale.
+ *
+ *   minDays:
+ *     The minimum number of days in a week for the resolved locale.
+ *
+ *   weekend:
+ *     The days of the week considered as the weekend for the resolved locale.
+ *
+ * Days are encoded as integers in the range 1=Monday to 7=Sunday.
+ */
+function Intl_getCalendarInfo(locales) {
+  // 1. Let requestLocales be ? CanonicalizeLocaleList(locales).
+  const requestedLocales = CanonicalizeLocaleList(locales);
+
+  const DateTimeFormat = dateTimeFormatInternalProperties;
+
+  // 2. Let localeData be %DateTimeFormat%.[[localeData]].
+  const localeData = DateTimeFormat.localeData;
+
+  // 3. Let localeOpt be a new Record.
+  const localeOpt = new_Record();
+
+  // 4. Set localeOpt.[[localeMatcher]] to "best fit".
+  localeOpt.localeMatcher = "best fit";
+
+  // 5. Let r be ResolveLocale(%DateTimeFormat%.[[availableLocales]],
+  //    requestedLocales, localeOpt,
+  //    %DateTimeFormat%.[[relevantExtensionKeys]], localeData).
+  const r = ResolveLocale(
+    "DateTimeFormat",
+    requestedLocales,
+    localeOpt,
+    DateTimeFormat.relevantExtensionKeys,
+    localeData
+  );
+
+  // 6. Let result be GetCalendarInfo(r.[[locale]]).
+  const result = intl_GetCalendarInfo(r.locale);
+  DefineDataProperty(result, "calendar", r.ca);
+  DefineDataProperty(result, "locale", r.locale);
+
+  // 7. Return result.
+  return result;
+}