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diff --git a/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-event-constructor.html b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-event-constructor.html
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+++ b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-event-constructor.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/#the-promiserejectionevent-interface">
+<script>
+'use strict';
+
+test(function() {
+  var p = new Promise(function(resolve, reject) {});
+
+  assert_throws_js(TypeError,
+                   function() {
+                     PromiseRejectionEvent('', { promise: p });
+                   },
+                   "Calling PromiseRejectionEvent constructor without 'new' must throw");
+
+  // No custom options are passed (besides required promise).
+  assert_equals(new PromiseRejectionEvent('eventType', { promise: p }).bubbles, false);
+  assert_equals(new PromiseRejectionEvent('eventType', { promise: p }).cancelable, false);
+  assert_equals(new PromiseRejectionEvent('eventType', { promise: p }).promise, p);
+  assert_equals(new PromiseRejectionEvent('eventType', { promise: p }).reason, undefined);
+
+  // No promise is passed.
+  assert_throws_js(TypeError,
+                   function() {
+                     new PromiseRejectionEvent('eventType', { bubbles: false });
+                   },
+                   'Cannot construct PromiseRejectionEventInit without promise');
+
+  // bubbles is passed.
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: false, promise: p }).bubbles, false);
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true, promise: p }).bubbles, true);
+
+  // cancelable is passed.
+  assert_equals(new PromiseRejectionEvent('eventType', { cancelable: false, promise: p }).cancelable, false);
+  assert_equals(new PromiseRejectionEvent('eventType', { cancelable: true, promise: p }).cancelable, true);
+
+  // reason is passed.
+  var r = new Error();
+  assert_equals(new PromiseRejectionEvent('eventType', { promise: p, reason: r }).reason, r);
+  assert_equals(new PromiseRejectionEvent('eventType', { promise: p, reason: null }).reason, null);
+
+  // All initializers are passed.
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true, cancelable: true, promise: p, reason: r }).bubbles, true);
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true, cancelable: true, promise: p, reason: r }).cancelable, true);
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true, cancelable: true, promise: p, reason: r }).promise, p);
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true, cancelable: true, promise: p, reason: r }).reason, r);
+}, "This tests the constructor for the PromiseRejectionEvent DOM class.");
+</script>