interface-prototype-object.html

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This WPT test may be referenced by the following Test IDs:
- /webidl/ecmascript-binding/interface-prototype-object.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Interface prototype objects</title>

<link rel="help" href="https://webidl.spec.whatwg.org/#interface-prototype-object">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

test(function() {

  // https://webidl.spec.whatwg.org/#create-an-interface-prototype-object

  assert_own_property(Element.prototype, Symbol.unscopables, "Element.prototype has @@unscopables.");

  let unscopables = Element.prototype[Symbol.unscopables];

  assert_equals(typeof unscopables, "object", "@@unscopables is an Object.");

  assert_equals(Object.getPrototypeOf(unscopables), null, "@@unscopables's prototype is null.");

}, "[Unscopable] extended attribute makes @@unscopables object on the prototype object, whose prototype is null.");

</script>