// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-equality-operators-runtime-semantics-evaluation
description: >
Abstract Equality special-cases [[IsHTMLDDA]] objects with `undefined` and `null`.
info: |
EqualityExpression : EqualityExpression != RelationalExpression
[...]
5. Let r be the result of performing Abstract Equality Comparison rval == lval.
6. ReturnIfAbrupt(r).
7. If r is true, return false. Otherwise, return true.
The [[IsHTMLDDA]] Internal Slot / Changes to Abstract Equality Comparison
The following steps are inserted after step 3 of the Abstract Equality Comparison algorithm:
1. If Type(x) is Object and x has an [[IsHTMLDDA]] internal slot and y is either null or undefined, return true.
2. If x is either null or undefined and Type(y) is Object and y has an [[IsHTMLDDA]] internal slot, return true.
features: [IsHTMLDDA]
---*/
var IsHTMLDDA = $262.IsHTMLDDA;
assert.sameValue(IsHTMLDDA != undefined, false, "!= with `undefined`");
assert.sameValue(undefined != IsHTMLDDA, false, "!= with `undefined`");
assert.sameValue(IsHTMLDDA != null, false, "!= with `null`");
assert.sameValue(null != IsHTMLDDA, false, "!= with `null`");
assert.sameValue(IsHTMLDDA != IsHTMLDDA, false);