diff --git a/lib/mixins/lazy-upgrade-mixin.html b/lib/mixins/lazy-upgrade-mixin.html
deleted file mode 100644
index 654a4d935e..0000000000
--- a/lib/mixins/lazy-upgrade-mixin.html
+++ /dev/null
@@ -1,126 +0,0 @@
-<!--
-@license
-Copyright (c) 2017 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
--->
-<link rel="import" href="../utils/boot.html">
-<link rel="import" href="../utils/mixin.html">
-<link rel="import" href="../utils/render-status.html">
-<script>
-  (function(){
-    'use strict';
-
-  /**
-   * Element class mixin that provides API for lazily upgrading Polymer Elements.
-   *
-   * This mixin can be used to lazily upgrade elements that are descendants of this element.
-   * This is useful for elements that have expensive descendants that are not necessary for
-   * the first rendering.
-   *
-   * To lazily upgrade descendant elements, those elements must have
-   * `disable-upgrade` and `lazy-upgrade` attributes.
-   * In addition, `<dom-if>` elements can be lazily displayed with just the
-   * `lazy-upgrade` attribute.
-   *
-   * The `lazy-upgrade` attribute can be given an optional priority value.
-   * The higher the value, the lower the priority. Default priority is 0.
-   *
-   * When upgrading elements, the mixin will upgrade as many as it can within the budget
-   * set by `_lazyUpgradeBudget`, which defaults to 16ms.
-   *
-   * When finished processing lazy-upgrade elements, this mixin will set `_lazyUpgrading`
-   * to false on the host.
-   *
-   * @polymerMixin
-   * @memberof Polymer
-   * @summary Element class mixin that provides API for lazily upgrading Polymer elements
-   */
-    Polymer.LazyUpgradeMixin = Polymer.dedupingMixin(function(base) {
-
-      const LAZY_UPGRADE = 'lazy-upgrade';
-      const DISABLE_UPGRADE = 'disable-upgrade';
-      const LAZY_UPGRADE_QUERY = `[${DISABLE_UPGRADE}][${LAZY_UPGRADE}], dom-if[${LAZY_UPGRADE}]`;
-      const LAZY_UPGRADE_BUDGET = 16;
-
-      // sort lazy-upgrade nodes for ascending value
-      function sortCandidates(a, b) {
-        let orderA = parseInt(a.getAttribute(LAZY_UPGRADE), 10) || 0;
-        let orderB = parseInt(b.getAttribute(LAZY_UPGRADE), 10) || 0;
-        return orderA - orderB;
-      }
-
-      function findCandidates(root) {
-        let candidates = Array.from(root.querySelectorAll(LAZY_UPGRADE_QUERY));
-        candidates.sort(sortCandidates);
-        return candidates;
-      }
-
-      function upgradeNode(node) {
-        if (node.localName === 'dom-if') {
-          node.if = true;
-        }
-        node.removeAttribute(DISABLE_UPGRADE);
-        node.removeAttribute(LAZY_UPGRADE);
-      }
-
-      /**
-       * @polymerMixinClass
-       */
-      class LazyUpgrade extends base {
-        static get properties() {
-          return {
-            /**
-             * Instance-level property for configuring the frame budget in ms for lazy-upgrading elements.
-             * Defaults to 16 ms
-             */
-            _lazyUpgradeBudget: {
-              type: Number,
-              value: LAZY_UPGRADE_BUDGET
-            },
-            /**
-             * Instance-level property that is shows when the element is lazy-upgrading elements.
-             */
-            _lazyUpgrading: {
-              type: Boolean
-            }
-          }
-        }
-
-        ready() {
-          super.ready();
-          this.__lazyUpgradeQueue = findCandidates(this.shadowRoot || this);
-          this._lazyUpgrading = true;
-          this.__lazyUpgrade();
-        }
-
-        /**
-         * @private
-         */
-        __lazyUpgrade() {
-          if (this.__lazyUpgradeQueue.length) {
-            Polymer.RenderStatus.afterNextRender(this, this.__processLazyCandidates);
-          } else {
-            this._lazyUpgrading = false;
-          }
-        }
-
-        /**
-         * @private
-         */
-        __processLazyCandidates() {
-          const deadline = performance.now() + this._lazyUpgradeBudget;
-          while (this.__lazyUpgradeQueue.length && (performance.now() < deadline)) {
-            upgradeNode(this.__lazyUpgradeQueue.shift())
-          }
-          this.__lazyUpgrade();
-        }
-      }
-
-      return LazyUpgrade;
-    });
-  })();
-</script>
\ No newline at end of file
diff --git a/test/runner.html b/test/runner.html
index e84a0b9ca9..86c18d4d2c 100644
--- a/test/runner.html
+++ b/test/runner.html
@@ -69,8 +69,7 @@
       'unit/mixin-utils.html',
       'unit/mixin-behaviors.html',
       'unit/render-status.html',
-      'unit/disable-upgrade.html',
-      'unit/lazy-upgrade.html'
+      'unit/disable-upgrade.html'
     ];
 
     // http://eddmann.com/posts/cartesian-product-in-javascript/
diff --git a/test/smoke/lazy-upgrade.html b/test/smoke/lazy-upgrade.html
deleted file mode 100644
index d64732bfd5..0000000000
--- a/test/smoke/lazy-upgrade.html
+++ /dev/null
@@ -1,113 +0,0 @@
- <!--
-@license
-Copyright (c) 2017 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
--->
-<!DOCTYPE html>
-<html>
-<head>
-  <script src="../../../webcomponentsjs/webcomponents-lite.js"></script>
-  <link rel="import" href="../../polymer.html">
-  <link rel="import" href="../../lib/mixins/lazy-upgrade-mixin.html">
-</head>
-<body>
-
-<dom-module id="x-child">
-  <template>
-    <style>
-      :host {
-        display: block;
-        border: 2px solid lightgreen;
-        margin: 2px;
-        padding: 2px;
-      };
-    </style>
-    <div>I'm lazily upgrading! [[foo]]</div>
-  </template>
-  <script>
-    HTMLImports.whenReady(function() {
-      class XChild extends Polymer.Element {
-        static get is() { return 'x-child'}
-        static get properties() {
-          return {
-            prop: { value: 'hi'}
-          }
-        }
-        ready() {
-          super.ready();
-          const now = performance.now();
-          while (performance.now() < now + 8) {
-            //
-          }
-        }
-      }
-      customElements.define(XChild.is, XChild);
-    });
-  </script>
-</dom-module>
-
-
-<dom-module id="x-test">
-  <template>
-    <style>
-      :host {
-        display: block;
-        border: 2px solid orange;
-        padding: 2px;
-      };
-
-      x-child {
-        display: block;
-        border: 2px solid lightgreen;
-        margin: 2px;
-        padding: 2px;
-        min-height: 20px;
-      }
-
-      .done {
-        font-size: xx-large;
-      }
-    </style>
-    <div>element says: {{prop}}</div>
-    <x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child>
-    <x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child>
-    <x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child 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lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade 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lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade 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id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child><x-child id="child" disable-upgrade lazy-upgrade foo="[[prop]]"></x-child>
-    <template is="dom-if" lazy-upgrade>
-      <div class="done">Done!!!</div>
-    </template>
-  </template>
-  <script>
-    HTMLImports.whenReady(function() {
-      class XTest extends Polymer.LazyUpgradeMixin(Polymer.Element) {
-        static get is() { return 'x-test'}
-        static get properties() {
-          return {
-            prop: { value: 'hi'}
-          }
-        }
-        ready() {
-          this.addEventListener('lazy-upgrade-finished', () => {
-            this.classList.add('done');
-          });
-          super.ready();
-        }
-      }
-      customElements.define(XTest.is, XTest);
-    });
-  </script>
-</dom-module>
-
-<x-test></x-test>
-
-</body>
-</html>
diff --git a/test/unit/lazy-upgrade.html b/test/unit/lazy-upgrade.html
deleted file mode 100644
index 1e34db7ce2..0000000000
--- a/test/unit/lazy-upgrade.html
+++ /dev/null
@@ -1,261 +0,0 @@
-<!doctype html>
-<!--
-@license
-Copyright (c) 2017 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
--->
-<meta charset="utf-8">
-<script src="../../../webcomponentsjs/webcomponents-lite.js"></script>
-<script src="../../../web-component-tester/browser.js"></script>
-<link rel="import" href="../../polymer-element.html">
-<link rel="import" href="../../lib/elements/dom-if.html">
-<link rel="import" href="../../lib/mixins/lazy-upgrade-mixin.html">
-<link rel="import" href="../../lib/utils/async.html">
-<link rel="import" href="../../lib/utils/debounce.html">
-
-<script>
-  addEventListener('WebComponentsReady', function() {
-    let async = Polymer.Async.timeOut.after(150);
-    window.LazyParentMixin = class LazyParent extends Polymer.LazyUpgradeMixin(Polymer.Element) {
-      static get observers() {
-        return ['lazyUpgradingChanged(_lazyUpgrading)']
-      }
-      connectedCallback() {
-        this.upgradedChildren = [];
-        this.addEventListener('rendered', (e) => {
-          this.upgradedChildren.push(e.composedPath()[0]);
-        });
-        super.connectedCallback();
-      }
-      lazyUpgradingChanged() {
-        this.__lazyDebouncer = Polymer.Debouncer.debounce(this.__lazyDebouncer, async, () => {
-          this.dispatchEvent(new Event('lazy-upgrade-finished'));
-        });
-      }
-    }
-  });
-</script>
-
-<dom-module id="lazy-child">
-  <template>
-    <style>
-      /* Work around IE/Edge bug with :not([attr]) */
-      :host([disable-upgrade]) {
-        display: block;
-      }
-      :host(:not([disable-upgrade])) {
-        display: block;
-        border: 2px solid blue;
-        height: 20px;
-      }
-    </style>
-  </template>
-  <script>
-    addEventListener('WebComponentsReady', function() {
-      class LazyChild extends Polymer.Element {
-        static get is() {return 'lazy-child'}
-        ready() {
-          super.ready();
-          this.dispatchEvent(new Event('rendered', {bubbles: true, composed: true}));
-        }
-      }
-      customElements.define('lazy-child', LazyChild);
-    });
-  </script>
-</dom-module>
-
-<dom-module id="lazy-upgrade-shadow">
-  <template>
-    <lazy-child id="one" disable-upgrade lazy-upgrade></lazy-child>
-    <lazy-child id="two" disable-upgrade lazy-upgrade="1"></lazy-child>
-    <lazy-child id="three"></lazy-child>
-    <dom-if lazy-upgrade="1">
-      <template>
-        <lazy-child id="four"></lazy-child>
-      </template>
-    </dom-if>
-    <lazy-child id="five" disable-upgrade></lazy-child>
-    <dom-if lazy-upgrade>
-      <template>
-        <lazy-child id="six"></lazy-child>
-      </template>
-    </dom-if>
-  </template>
-  <script>
-    addEventListener('WebComponentsReady', function() {
-      customElements.define('lazy-upgrade-shadow', class extends window.LazyParentMixin {
-        static get is() { return 'lazy-upgrade-shadow' }
-      });
-    });
-  </script>
-</dom-module>
-
-<dom-module id="lazy-parent">
-  <script>
-    addEventListener('WebComponentsReady', function() {
-      customElements.define('lazy-parent', class extends window.LazyParentMixin {});
-    });
-  </script>
-</dom-module>
-
-<template id="only-lazy-upgrade">
-  <dom-if>
-    <template>
-      <lazy-child id="one"></lazy-child>
-    </template>
-  </dom-if>
-  <dom-if lazy-upgrade>
-    <template>
-      <lazy-child id="two"></lazy-child>
-    </template>
-  </dom-if>
-  <lazy-child id="three" disable-upgrade></lazy-child>
-  <lazy-child id="four" disable-upgrade lazy-upgrade></lazy-child>
-</template>
-
-<template id="critical">
-  <lazy-child id="lazy-one" disable-upgrade lazy-upgrade></lazy-child>
-  <lazy-child id="critical"></lazy-child>
-  <lazy-child id="lazy-two" disable-upgrade lazy-upgrade></lazy-child>
-</template>
-
-<template id="ordered">
-  <lazy-child id="one" disable-upgrade lazy-upgrade="3"></lazy-child>
-  <lazy-child id="two" disable-upgrade lazy-upgrade="2"></lazy-child>
-  <lazy-child id="three" disable-upgrade lazy-upgrade="1"></lazy-child>
-  <lazy-child id="four" disable-upgrade lazy-upgrade></lazy-child>
-  <lazy-child id="five" disable-upgrade lazy-upgrade="2"></lazy-child>
-</template>
-
-<dom-module id="no-upgrade-shadow">
-  <template>
-    <lazy-child id="one" disable-upgrade lazy-upgrade></lazy-child>
-  </template>
-</dom-module>
-
-<script>
-  addEventListener('WebComponentsReady', () => {
-    customElements.define('no-upgrade-shadow', class extends Polymer.Element {
-      static get is() { return 'no-upgrade-shadow' }
-    });
-  });
-</script>
-
-<template id="scoped">
-  <no-upgrade-shadow></no-upgrade-shadow>
-  <lazy-child id="three" disable-upgrade lazy-upgrade></lazy-child>
-</template>
-
-<script>
-  suite('Lazy Upgrade Mixin', () => {
-    function assertUpgraded(node, expected) {
-      let disabled = node.hasAttribute('disable-upgrade');
-      assert.notEqual(disabled, expected, 'upgrade status was not expected');
-    }
-
-    function assertRendered(node, expected) {
-      let border = getComputedStyle(node).getPropertyValue('border-top-width');
-      assert.equal(border, expected ? '2px' : '0px', 'render status was not expected');
-    }
-
-    test('fires "lazy-upgrade-finished" event when done', (done) => {
-      let el = document.createElement('lazy-parent');
-      el.addEventListener('lazy-upgrade-finished', () => {
-        document.body.removeChild(el)
-        done();
-      });
-      document.body.appendChild(el);
-    });
-
-    test('Lazy Upgrading shows critical section first, lazy elements later', (done) => {
-      let template = document.querySelector('template#critical');
-      let el = document.createElement('lazy-parent');
-      el.appendChild(document.importNode(template.content, true));
-      let children = el.querySelectorAll('lazy-child');
-      el.addEventListener('lazy-upgrade-finished', () => {
-        for (let i = 0; i < children.length; i++) {
-          assertUpgraded(children[i], true);
-        }
-        el.parentNode.removeChild(el);
-        done();
-      })
-      document.body.appendChild(el);
-      assertUpgraded(children[0], false);
-      assertUpgraded(children[1], true);
-      assertUpgraded(children[2], false);
-    });
-
-    test('Lazy Upgrading activates elements with lazy-upgrade attribute', (done) => {
-      let template = document.querySelector('template#only-lazy-upgrade');
-      let el = document.createElement('lazy-parent');
-      el.appendChild(document.importNode(template.content, true));
-      el.addEventListener('lazy-upgrade-finished', () => {
-        let children = el.querySelectorAll('lazy-child');
-        assert.equal(children.length, 3);
-        assertRendered(children[0], true);
-        assertRendered(children[1], false);
-        assertRendered(children[2], true);
-        document.body.removeChild(el);
-        done();
-      });
-      document.body.appendChild(el);
-    });
-
-    test('Lazy upgrading respects ordering', (done) => {
-      let template = document.querySelector('template#ordered');
-      let el = document.createElement('lazy-parent');
-      el.appendChild(document.importNode(template.content, true));
-      el.addEventListener('lazy-upgrade-finished', () => {
-        let expected = [
-          "four",
-          "three",
-          "two",
-          "five",
-          "one"
-        ];
-        document.body.removeChild(el);
-        assert.deepEqual(el.upgradedChildren.map(n => n.id), expected);
-        done();
-      });
-      document.body.appendChild(el);
-    });
-
-    test('Shadow DOM works the same', (done) => {
-      let el = document.createElement('lazy-upgrade-shadow');
-      el.addEventListener('lazy-upgrade-finished', () => {
-        let children = el.shadowRoot.querySelectorAll('lazy-child');
-        assert.equal(children.length, 6);
-        let expected = [
-          "three",
-          "one",
-          "two",
-          "six",
-          "four"
-        ];
-        assert.deepEqual(el.upgradedChildren.map(n => n.id), expected);
-        document.body.removeChild(el);
-        done();
-      });
-      document.body.appendChild(el);
-    });
-
-    test('Candidates are only found in the same scope', (done) => {
-      let template = document.querySelector('template#scoped');
-      let el = document.createElement('lazy-parent');
-      el.addEventListener('lazy-upgrade-finished', () => {
-        let expected = [
-          "three"
-        ];
-        assert.deepEqual(el.upgradedChildren.map(n => n.id), expected);
-        document.body.removeChild(el);
-        done();
-      });
-      el.appendChild(document.importNode(template.content, true));
-      document.body.appendChild(el);
-    });
-  })
-</script>
\ No newline at end of file