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diff --git a/js/src/tests/test262/language/identifiers/start-unicode-12.0.0.js b/js/src/tests/test262/language/identifiers/start-unicode-12.0.0.js
new file mode 100644
index 0000000000..c013dc850e
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+++ b/js/src/tests/test262/language/identifiers/start-unicode-12.0.0.js
@@ -0,0 +1,16 @@
+// Copyright 2020 Mathias Bynens. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Mathias Bynens
+esid: sec-names-and-keywords
+description: |
+  Test that Unicode v12.0.0 ID_Start characters are accepted as
+  identifier start characters.
+info: |
+  Generated by https://github.com/mathiasbynens/caniunicode
+---*/
+
+var ຆຉຌຎຏຐຑຒຓຘຠຨຩຬᳲᳳᳺꞺꞻꞼꞽꞾꞿꟂꟃꟄꟅꟆꭦꭧ𐿠𐿡𐿢𐿣𐿤𐿥𐿦𐿧𐿨𐿩𐿪𐿫𐿬𐿭𐿮𐿯𐿰𐿱𐿲𐿳𐿴𐿵𐿶𑑟𑚸𑦠𑦡𑦢𑦣𑦤𑦥𑦦𑦧𑦪𑦫𑦬𑦭𑦮𑦯𑦰𑦱𑦲𑦳𑦴𑦵𑦶𑦷𑦸𑦹𑦺𑦻𑦼𑦽𑦾𑦿𑧀𑧁𑧂𑧃𑧄𑧅𑧆𑧇𑧈𑧉𑧊𑧋𑧌𑧍𑧎𑧏𑧐𑧡𑧣𑪄𑪅𖽅𖽆𖽇𖽈𖽉𖽊𖿣𘟲𘟳𘟴𘟵𘟶𘟷𛅐𛅑𛅒𛅤𛅥𛅦𛅧𞄀𞄁𞄂𞄃𞄄𞄅𞄆𞄇𞄈𞄉𞄊𞄋𞄌𞄍𞄎𞄏𞄐𞄑𞄒𞄓𞄔𞄕𞄖𞄗𞄘𞄙𞄚𞄛𞄜𞄝𞄞𞄟𞄠𞄡𞄢𞄣𞄤𞄥𞄦𞄧𞄨𞄩𞄪𞄫𞄬𞄷𞄸𞄹𞄺𞄻𞄼𞄽𞅎𞋀𞋁𞋂𞋃𞋄𞋅𞋆𞋇𞋈𞋉𞋊𞋋𞋌𞋍𞋎𞋏𞋐𞋑𞋒𞋓𞋔𞋕𞋖𞋗𞋘𞋙𞋚𞋛𞋜𞋝𞋞𞋟𞋠𞋡𞋢𞋣𞋤𞋥𞋦𞋧𞋨𞋩𞋪𞋫𞥋;
+
+reportCompare(0, 0);