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diff --git a/js/src/tests/test262/annexB/language/expressions/conditional/emulates-undefined.js b/js/src/tests/test262/annexB/language/expressions/conditional/emulates-undefined.js
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+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-conditional-operator-runtime-semantics-evaluation
+description: >
+  ToBoolean returns `false` for [[IsHTMLDDA]] object; trueRef is not evaluated.
+info: |
+  ConditionalExpression : ShortCircuitExpression ? AssignmentExpression : AssignmentExpression
+
+  1. Let lref be the result of evaluating ShortCircuitExpression.
+  2. Let lval be ! ToBoolean(? GetValue(lref)).
+  3. If lval is true, then
+    [...]
+  4. Else,
+    a. Let falseRef be the result of evaluating the second AssignmentExpression.
+    b. Return ? GetValue(falseRef).
+
+  The [[IsHTMLDDA]] Internal Slot / Changes to ToBoolean
+
+  1. If argument has an [[IsHTMLDDA]] internal slot, return false.
+  2. Return true.
+features: [IsHTMLDDA]
+---*/
+
+assert.sameValue($262.IsHTMLDDA ? unresolved : 2, 2);
+
+reportCompare(0, 0);