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diff --git a/catapult/third_party/polymer/components/shadycss/tests/no-scopingshim/custom-style.html b/catapult/third_party/polymer/components/shadycss/tests/no-scopingshim/custom-style.html
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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="../../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="../../apply-shim.min.js"></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>
+
+<custom-style>
+  <style>
+  html {
+    --foo: rgb(123, 123, 123);
+    --bar: {
+      border: 2px solid red;
+    }
+  }
+  </style>
+</custom-style>
+
+<template id="x-inner">
+  <style>
+    :host {
+      display: block;
+      height: 100px;
+      width: 100px;
+      border: 4px solid blue;
+      background-color: var(--foo);
+      @apply --bar;
+    }
+  </style>
+</template>
+
+<template id="x-outer">
+  <style>
+  :host {
+    display: block;
+    @apply --bar;
+  }
+  </style>
+  <x-inner></x-inner>
+</template>
+
+<x-outer id="target"></x-outer>
+
+<script>
+  suite('Custom Style upgrades', function() {
+    suiteSetup(function() {
+      makeElement('x-inner');
+      makeElement('x-outer');
+    });
+    test('custom-style applies to deeply nested elements', function() {
+      var target = document.querySelector('#target');
+      var inner = target.shadowRoot.querySelector('x-inner');
+      assert.equal(getComputedStyle(inner).backgroundColor, 'rgb(123, 123, 123)');
+    });
+    test('custom-style applied mixins update', function() {
+      var target = document.querySelector('#target');
+      var inner = target.shadowRoot.querySelector('x-inner');
+      assert.equal(getComputedStyle(target).borderTopWidth.trim(), '2px');
+      assert.equal(getComputedStyle(inner).borderTopWidth.trim(), '2px');
+    });
+  });
+</script>
+\ No newline at end of file