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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-binary-logical-operators-runtime-semantics-evaluation
+description: >
+ ToBoolean returns `false` for [[IsHTMLDDA]] object.
+info: |
+ UnaryExpression : ! UnaryExpression
+
+ 1. Let expr be the result of evaluating UnaryExpression.
+ 2. Let oldValue be ! ToBoolean(? GetValue(expr)).
+ 3. If oldValue is true, return false.
+ 4. Return true.
+
+ The [[IsHTMLDDA]] Internal Slot / Changes to ToBoolean
+
+ 1. If argument has an [[IsHTMLDDA]] internal slot, return false.
+ 2. Return true.
+features: [IsHTMLDDA]
+---*/
+
+var IsHTMLDDA = $262.IsHTMLDDA;
+
+assert(!IsHTMLDDA);
+assert.sameValue(!!IsHTMLDDA, false);
+
+reportCompare(0, 0);