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+<!doctype html>
+<!--
+@license
+Copyright (c) 2014 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
+-->
+<script>
+WCT = {waitFor: function (cb) {HTMLImports.whenReady(cb)}}
+</script>
+<script src="./test-flags.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="../apply-shim.min.js"></script>
+  <script>
+  if (customElements.polyfillWrapFlushCallback) {
+    // delay definition of custom-style until after template polyfill loads
+    customElements.polyfillWrapFlushCallback(function(cb) {
+      HTMLImports.whenReady(cb);
+    });
+  }
+  </script>
+<script src="../custom-style-interface.min.js"></script>
+<script src="module/generated/make-element.js"></script>
+<script src="module/generated/custom-style-element.js"></script>
+<script src="../node_modules/wct-browser-legacy/browser.js"></script>
+
+<template id="late">
+  <custom-style class="late-style">
+    <style>
+    html {
+      --late: {
+        border: 2px solid red;
+      };
+    }
+    </style>
+  </custom-style>
+</template>
+
+<template id="x-late">
+  <style>
+    :host {
+      display: block;
+      @apply --late;
+    }
+  </style>
+  <div>late</div>
+</template>
+
+<template id="x-host">
+  <style>
+  :host {
+    display: block;
+    padding: 4px;
+  }
+  </style>
+  <x-late></x-late>
+</template>
+
+<x-host></x-host>
+
+<script>
+suite('Async custom-style', function() {
+  suiteSetup(function() {
+    makeElement('x-host');
+  });
+  test('late custom-style updates elements', function(done) {
+    var lateTemplate = document.querySelector('template#late');
+    var host = document.querySelector('x-host');
+    var inner = host.shadowRoot.querySelector('x-late');
+    requestAnimationFrame(function() {
+      document.body.appendChild(document.importNode(lateTemplate.content, true));
+      makeElement('x-late');
+      requestAnimationFrame(function() {
+        assert.equal(getComputedStyle(inner).borderTopWidth.trim(), '2px');
+        done();
+      });
+    });
+  })
+})
+</script>
+\ No newline at end of file