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diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js
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+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js
@@ -0,0 +1,68 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+  Modifiers syntax `(?ims:)` is legal.
+info: |
+  Runtime Semantics: CompileAtom
+  The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+  Atom :: `(` `?` RegularExpressionFlags `:` Disjunction `)`
+    1. Let addModifiers be the source text matched by RegularExpressionFlags.
+    2. Let removeModifiers be the empty String.
+    3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), removeModifiers).
+    4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+  UpdateModifiers ( modifiers, add, remove )
+  The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+  1. Let dotAll be modifiers.[[DotAll]].
+  2. Let ignoreCase be modifiers.[[IgnoreCase]].
+  3. Let multiline be modifiers.[[Multiline]].
+  4. If add contains "s", set dotAll to true.
+  5. If add contains "i", set ignoreCase to true.
+  6. If add contains "m", set multiline to true.
+  7. If remove contains "s", set dotAll to false.
+  8. If remove contains "i", set ignoreCase to false.
+  9. If remove contains "m", set multiline to false.
+  10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?i:)/;
+/(?is:)/;
+/(?im:)/;
+/(?s:)/;
+/(?si:)/;
+/(?sm:)/;
+/(?m:)/;
+/(?mi:)/;
+/(?ms:)/;
+/(?ims:)/;
+/(?ism:)/;
+/(?sim:)/;
+/(?smi:)/;
+/(?mis:)/;
+/(?msi:)/;
+new RegExp("(?i:)");
+new RegExp("(?is:)");
+new RegExp("(?im:)");
+new RegExp("(?s:)");
+new RegExp("(?si:)");
+new RegExp("(?sm:)");
+new RegExp("(?m:)");
+new RegExp("(?mi:)");
+new RegExp("(?ms:)");
+new RegExp("(?ims:)");
+new RegExp("(?ism:)");
+new RegExp("(?sim:)");
+new RegExp("(?smi:)");
+new RegExp("(?mis:)");
+new RegExp("(?msi:)");
+
+reportCompare(0, 0);