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diff --git a/catapult/third_party/polymer/components/shadycss/tests/deferred-apply.html b/catapult/third_party/polymer/components/shadycss/tests/deferred-apply.html
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@@ -0,0 +1,82 @@
+<!doctype html>
+<!--
+@license
+Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<html>
+
+<head>
+
+  <meta charset="utf-8">
+  <script src="./test-flags.js"></script>
+  <script src="../node_modules/wct-browser-legacy/browser.js"></script>
+  <script src="../node_modules/@webcomponents/webcomponents-platform/webcomponents-platform.js"></script>
+  <script src="../node_modules/es6-promise/dist/es6-promise.auto.min.js"></script>
+  <script src="../node_modules/@webcomponents/template/template.js"></script>
+  <script src="../node_modules/@webcomponents/html-imports/html-imports.min.js"></script>
+  <script src="../node_modules/@webcomponents/shadydom/shadydom.min.js"></script>
+  <script src="../node_modules/@webcomponents/custom-elements/custom-elements.min.js"></script>
+  <script src="../scoping-shim.min.js"></script>
+  <script src="../custom-style-interface.min.js"></script>
+  <script src="module/generated/custom-style-element.js"></script>
+  <script src="module/generated/make-element.js"></script>
+  <title>Apply Shim Deferred</title>
+</head>
+<body>
+  <custom-style>
+    <style>
+      html {
+        --foo: {
+          background-color: rgb(0, 0, 255);
+        }
+      }
+    </style>
+  </custom-style>
+  <template id="x-foo">
+    <style>
+      :host {
+        display: block;
+        height: 100px;
+        width: 100px;
+        background-color: rgb(255, 0, 0);
+        @apply --foo;
+      }
+    </style>
+  </template>
+  <x-foo></x-foo>
+  <!-- emulate apply-shim imported into a module context -->
+  <script id="applyScript" src="../apply-shim.min.js" defer></script>
+  <script>
+    suite('Deferred Apply Shim', function() {
+      test('Styling works as expected', function() {
+        let resolveFn = null;
+        const promise = new Promise((resolve) => {resolveFn = resolve}).then(() => {
+          // IE 11 timing issue
+          if (window.HTMLTemplateElement.bootstrap) {
+            HTMLTemplateElement.bootstrap(document);
+          }
+          window.makeElement('x-foo');
+        }).then(() => {
+          const el = document.querySelector('x-foo');
+          assert.equal(getComputedStyle(el).getPropertyValue('background-color').trim(), 'rgb(0, 0, 255)');
+        });
+        if (document.readyState === 'complete') {
+          resolveFn();
+        } else {
+          window.addEventListener('load', resolveFn);
+          window.addEventListener('DOMContentLoaded', () => {
+            window.removeEventListener('load', resolveFn);
+            resolveFn();
+          });
+        }
+        return promise;
+      })
+    });
+  </script>
+</body>
+</html>
+\ No newline at end of file