diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..61dd1c8
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,238 @@
+{
+    "extends": [
+        "eslint:recommended",
+        "google"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 8,
+        "sourceType": "module"
+    },
+    "env": {
+        "browser": true,
+        "es6": true
+    },
+    "globals": {
+        "__dirname": false,
+        "app": false,
+        "page": false,
+        "Polymer": false,
+        "process": false,
+        "require": false,
+        "Gerrit": false,
+        "Promise": false,
+        "assert": false,
+        "test": false,
+        "flushAsynchronousOperations": false
+    },
+    "rules": {
+        "arrow-parens": [
+            "error",
+            "as-needed"
+        ],
+        "block-spacing": [
+            "error",
+            "always"
+        ],
+        "brace-style": [
+            "error",
+            "1tbs",
+            {
+                "allowSingleLine": true
+            }
+        ],
+        "camelcase": "off",
+        "comma-dangle": [
+            "error",
+            {
+                "arrays": "always-multiline",
+                "objects": "always-multiline",
+                "imports": "always-multiline",
+                "exports": "always-multiline",
+                "functions": "never"
+            }
+        ],
+        "eol-last": "off",
+        "indent": [
+            "error",
+            2,
+            {
+                "MemberExpression": 2,
+                "FunctionDeclaration": {
+                    "body": 1,
+                    "parameters": 2
+                },
+                "FunctionExpression": {
+                    "body": 1,
+                    "parameters": 2
+                },
+                "CallExpression": {
+                    "arguments": 2
+                },
+                "ArrayExpression": 1,
+                "ObjectExpression": 1,
+                "SwitchCase": 1
+            }
+        ],
+        "keyword-spacing": [
+            "error",
+            {
+                "after": true,
+                "before": true
+            }
+        ],
+        "lines-between-class-members": [
+            "error",
+            "always"
+        ],
+        "max-len": [
+            "error",
+            80,
+            2,
+            {
+                "ignoreComments": true,
+                "ignorePattern": "^import .*;$"
+            }
+        ],
+        "new-cap": [
+            "error",
+            {
+                "capIsNewExceptions": [
+                    "Polymer",
+                    "LegacyElementMixin",
+                    "GestureEventListeners",
+                    "LegacyDataMixin"
+                ]
+            }
+        ],
+        "no-console": "off",
+        "no-multiple-empty-lines": [
+            "error",
+            {
+                "max": 1
+            }
+        ],
+        "no-prototype-builtins": "off",
+        "no-redeclare": "off",
+        "no-restricted-syntax": [
+            "error",
+            {
+                "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='test'][property.name='only']",
+                "message": "Remove test.only."
+            },
+            {
+                "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='suite'][property.name='only']",
+                "message": "Remove suite.only."
+            }
+        ],
+        "no-undef": "off",
+        "no-useless-escape": "off",
+        "no-var": "error",
+        "object-shorthand": [
+            "error",
+            "always"
+        ],
+        "padding-line-between-statements": [
+            "error",
+            {
+                "blankLine": "always",
+                "prev": "class",
+                "next": "*"
+            },
+            {
+                "blankLine": "always",
+                "prev": "*",
+                "next": "class"
+            }
+        ],
+        "prefer-arrow-callback": "error",
+        "prefer-const": "error",
+        "prefer-spread": "error",
+        "quote-props": [
+            "error",
+            "consistent-as-needed"
+        ],
+        "require-jsdoc": "off",
+        "semi": [
+            2,
+            "always"
+        ],
+        "template-curly-spacing": "error",
+        "valid-jsdoc": "off",
+        "require-jsdoc": 0,
+        "valid-jsdoc": 0,
+        "jsdoc/check-alignment": 2,
+        "jsdoc/check-examples": 0,
+        "jsdoc/check-indentation": 0,
+        "jsdoc/check-param-names": 0,
+        "jsdoc/check-syntax": 0,
+        "jsdoc/check-tag-names": 0,
+        "jsdoc/check-types": 0,
+        "jsdoc/implements-on-classes": 2,
+        "jsdoc/match-description": 0,
+        "jsdoc/newline-after-description": 2,
+        "jsdoc/no-types": 0,
+        "jsdoc/no-undefined-types": 0,
+        "jsdoc/require-description": 0,
+        "jsdoc/require-description-complete-sentence": 0,
+        "jsdoc/require-example": 0,
+        "jsdoc/require-hyphen-before-param-description": 0,
+        "jsdoc/require-jsdoc": 0,
+        "jsdoc/require-param": 0,
+        "jsdoc/require-param-description": 0,
+        "jsdoc/require-param-name": 2,
+        "jsdoc/require-param-type": 2,
+        "jsdoc/require-returns": 0,
+        "jsdoc/require-returns-check": 0,
+        "jsdoc/require-returns-description": 0,
+        "jsdoc/require-returns-type": 2,
+        "jsdoc/valid-types": 2,
+        "jsdoc/require-file-overview": [
+            "error",
+            {
+                "tags": {
+                    "license": {
+                        "mustExist": true,
+                        "preventDuplicates": true
+                    }
+                }
+            }
+        ],
+        "import/named": 2,
+        "import/no-unresolved": 2,
+        "import/no-self-import": 2,
+        // The no-cycle rule is slow, because it doesn't cache dependencies.
+        // Disable it.
+        "import/no-cycle": 0,
+        "import/no-useless-path-segments": 2,
+        "import/no-unused-modules": 2,
+        "import/no-default-export": 2
+    },
+    "plugins": [
+        "html",
+        "jsdoc",
+        "import"
+    ],
+    "settings": {
+        "html/report-bad-indent": "error"
+    },
+    "overrides": [
+        {
+            "files": [
+                "*_html.js",
+                "*-styles.js",
+                "externs.js"
+            ],
+            "rules": {
+                "max-len": "off"
+            }
+        },
+        {
+            "files": [
+                "*.html"
+            ],
+            "rules": {
+                "jsdoc/require-file-overview": "off"
+            }
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index d528a68..6ad0d3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 /bazel-*
 /eclipse-out
 node_modules
+bower_components
 npm-debug.log
 dist
 fonts
diff --git a/BUILD b/BUILD
index c97e62e..3ff7216 100644
--- a/BUILD
+++ b/BUILD
@@ -1,12 +1,23 @@
 load("//tools/bzl:js.bzl", "polygerrit_plugin")
+load("@npm_bazel_rollup//:index.bzl", "rollup_bundle")
+
 
 polygerrit_plugin(
     name = "image-diff",
-    srcs = glob([
-        "**/*.html",
-        "**/*.js",
-    ]),
-    app = "plugin.html",
-    externs = ["externs.js"],
-    deps = ["//lib/js:resemblejs"],
+    app = "plugin-bundle.js",
 )
+
+rollup_bundle(
+    name = "plugin-bundle",
+    srcs = glob([
+        "**/*.js",
+    ]) + ["@plugins_npm//:node_modules"],
+    config_file = "rollup.config.js",
+    entry_point = "plugin.js",
+    format = "iife",
+    rollup_bin = "//tools/node_tools:rollup-bin",
+    sourcemap = "hidden",
+    deps = [
+        "@tools_npm//rollup-plugin-node-resolve",
+    ],
+)
\ No newline at end of file
diff --git a/README.md b/README.md
index f11bd02..cffe021 100644
--- a/README.md
+++ b/README.md
@@ -7,27 +7,11 @@
 
 These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.
 
-### Prerequisites
+### Build
 
-[Yarn](https://yarnpkg.com/en/) - Node package manager
-
-### Installing
-
-Use Homebrew to install yarn on macOS:
-
-```
-brew install yarn
-```
-
-Reference [here](https://yarnpkg.com/en/docs/install#mac-stable) for instruction on how to install on other systems.
-
-Clone the repo and run
-
-```
-yarn install
-```
-
-to install the dependencies.
+1. Clone the package into `plugins` folder of `gerrit` repo or link the plugin folder to `gerrit/plugins` folder
+2. Override `plugins/package.json` with `package.json`, you can remove all `depDependencies` as they are not needed for the build (needed for running wct tests)
+3. Run `bazel build plugins/image-diff`
 
 ## Highlight Mode
 
@@ -59,6 +43,8 @@
 
 Inside your image-diff repo, run `polymer serve` to start a local web server and open `localhost:8080/test` to view your tests. See [here](https://www.polymer-project.org/2.0/docs/tools/polymer-cli-commands#serve) for more info.
 
+Or run `npm run wct-test` to run all your tests.
+
 ## Development
 
 Reference [here](https://gerrit.googlesource.com/gerrit/+/master/polygerrit-ui/) on how to set up your Gerrit testsite and [here](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.3/pg-plugin-dev.html#loading) for PolyGerrit plugin development.
diff --git a/bower.json b/bower.json
new file mode 100644
index 0000000..36dd172
--- /dev/null
+++ b/bower.json
@@ -0,0 +1,15 @@
+{
+  "name": "image-diff",
+  "license": "http://www.apache.org/licenses/LICENSE-2.0",
+  "devDependencies": {
+    "es6-promise": "^3.3.1",
+    "chai": "^4.2.0",
+    "mocha": "^6.2.2",
+    "web-component-tester": "^6.5.1"
+  },
+  "private": true,
+  "resolutions": {
+    "chai": "^3.2.0",
+    "mocha": "^3.1.2"
+  }
+}
\ No newline at end of file
diff --git a/externs.js b/externs.js
deleted file mode 100644
index 2d41eb5..0000000
--- a/externs.js
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
- * @fileoverview Defines externally defined symbols that the JS Closure compiler
- * must be aware of: 1. Don't complain about "is undeclared". 2. Don't rename.
- *
- * @externs
- */
-
-/**
- * resemblejs uses the nodejs require fuction without declaring it
- *
- * @param {string} id
- * @return {*}
- */
-function require(id) {}
diff --git a/gr-image-diff-tool/gr-image-diff-tool.html b/gr-image-diff-tool/gr-image-diff-tool.html
deleted file mode 100644
index e85a260..0000000
--- a/gr-image-diff-tool/gr-image-diff-tool.html
+++ /dev/null
@@ -1,78 +0,0 @@
-<!--
-Copyright (C) 2018 The Android Open Source Project
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
--->
-
-<link rel="import" href="../gr-opacity-diff-mode/gr-opacity-diff-mode.html">
-<link rel="import" href="../gr-resemble-diff-mode/gr-resemble-diff-mode.html">
-
-<dom-module id="gr-image-diff-tool">
-  <template>
-    <style>
-      :host {
-        background-color: var(--table-header-background-color, #fafafa);
-        display: block;
-        font-family: var(--font-family);
-      }
-      #header {
-        align-items: center;
-        border-bottom: 1px solid var(--border-color, #ddd);
-        border-top: 1px solid var(--border-color, #ddd);
-        display: inline-flex;
-        padding: .5em;
-        width: 100%;
-      }
-      h3 {
-        padding: 0 .5em;
-      }
-      #dropdown {
-        background-color: var(--view-background-color);
-        border: 1px solid var(--border-color);
-        border-radius: 2px;
-        color: var(--primary-text-color);
-        font-size: var(--font-size-normal);
-        height: 2em;
-        margin-left: 1em;
-        padding: 0 .15em;
-      }
-      .diffmode {
-        align-items: center;
-        display: flex;
-        justify-content: center;
-      }
-    </style>
-    <div id="header">
-      <h3>Image diff</h3>
-      <select value="{{_observeMode::change}}" id="dropdown">
-        <option value="resemble" title="Scale the images to the same size and compute a diff with highlights">Highlight differences</option>
-        <option value="opacity" title="Overlay the new image over the old and use an opacity control to view the differences">Onion skin</option>
-      </select>
-    </div>
-    <div class="diffmode">
-      <template is="dom-if" if="[[_showResembleMode]]" restamp="true">
-        <gr-resemble-diff-mode
-            base-image="[[baseImage]]"
-            revision-image="[[revisionImage]]"></gr-resemble-diff-mode>
-      </template>
-    </div>
-    <div class="diffmode">
-      <template is="dom-if" if="[[_showOpacityMode]]" restamp="true">
-        <gr-opacity-diff-mode
-            base-image="[[baseImage]]"
-            revision-image="[[revisionImage]]"></gr-opacity-diff-mode>
-      </template>
-    </div>
-  </template>
-  <script src="gr-image-diff-tool.js"></script>
-</dom-module>
diff --git a/gr-image-diff-tool/gr-image-diff-tool.js b/gr-image-diff-tool/gr-image-diff-tool.js
index 811db7c..287db5e 100644
--- a/gr-image-diff-tool/gr-image-diff-tool.js
+++ b/gr-image-diff-tool/gr-image-diff-tool.js
@@ -1,28 +1,39 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {htmlTemplate} from './gr-image-diff-tool_html.js';
+import '../gr-opacity-diff-mode/gr-opacity-diff-mode.js';
+import '../gr-resemble-diff-mode/gr-resemble-diff-mode.js';
 
-  const DiffModes = {
-    OPACITY: 'opacity',
-    RESEMBLE: 'resemble',
-  };
+const DiffModes = {
+  OPACITY: 'opacity',
+  RESEMBLE: 'resemble',
+};
 
-  Polymer({
-    is: 'gr-image-diff-tool',
+class ImageDiffTool extends Polymer.Element {
+  static get is() {
+    return 'gr-image-diff-tool';
+  }
 
-    properties: {
+  static get template() {
+    return htmlTemplate;
+  }
+
+  static get properties() {
+    return {
       baseImage: Object,
       revisionImage: Object,
       hidden: {
@@ -36,43 +47,48 @@
         type: String,
         observer: '_handleSelect',
       },
-    },
+    };
+  }
 
-    attached() {
-      if (!this.baseImage || !this.revisionImage) {
-        // No need to show the diff tool if there are no images.
-        this.hidden = true;
-      }
-      const diff_mode = this._getMode();
-      diff_mode === DiffModes.OPACITY ?
-          this._displayOpacityMode() : this._displayResembleMode();
-    },
+  connectedCallback() {
+    super.connectedCallback();
+    if (!this.baseImage || !this.revisionImage) {
+      // No need to show the diff tool if there are no images.
+      this.hidden = true;
+    }
+    const diff_mode = this._getMode();
+    diff_mode === DiffModes.OPACITY
+      ? this._displayOpacityMode()
+      : this._displayResembleMode();
+  }
 
-    _getMode() {
-      return window.localStorage.getItem('image-diff-mode');
-    },
+  _getMode() {
+    return window.localStorage.getItem('image-diff-mode');
+  }
 
-    _setMode(mode) {
-      window.localStorage.setItem('image-diff-mode', mode);
-    },
+  _setMode(mode) {
+    window.localStorage.setItem('image-diff-mode', mode);
+  }
 
-    _handleSelect(mode) {
-      mode === DiffModes.OPACITY ?
-          this._displayOpacityMode() : this._displayResembleMode();
-    },
+  _handleSelect(mode) {
+    mode === DiffModes.OPACITY
+      ? this._displayOpacityMode()
+      : this._displayResembleMode();
+  }
 
-    _displayResembleMode() {
-      this._observeMode = DiffModes.RESEMBLE;
-      this._showResembleMode = true;
-      this._showOpacityMode = false;
-      this._setMode(DiffModes.RESEMBLE);
-    },
+  _displayResembleMode() {
+    this._observeMode = DiffModes.RESEMBLE;
+    this._showResembleMode = true;
+    this._showOpacityMode = false;
+    this._setMode(DiffModes.RESEMBLE);
+  }
 
-    _displayOpacityMode() {
-      this._observeMode = DiffModes.OPACITY;
-      this._showResembleMode = false;
-      this._showOpacityMode = true;
-      this._setMode(DiffModes.OPACITY);
-    },
-  });
-})();
+  _displayOpacityMode() {
+    this._observeMode = DiffModes.OPACITY;
+    this._showResembleMode = false;
+    this._showOpacityMode = true;
+    this._setMode(DiffModes.OPACITY);
+  }
+}
+
+customElements.define(ImageDiffTool.is, ImageDiffTool);
\ No newline at end of file
diff --git a/gr-image-diff-tool/gr-image-diff-tool_html.js b/gr-image-diff-tool/gr-image-diff-tool_html.js
new file mode 100644
index 0000000..6a25ff5
--- /dev/null
+++ b/gr-image-diff-tool/gr-image-diff-tool_html.js
@@ -0,0 +1,72 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export const htmlTemplate = Polymer.html`
+<style>
+  :host {
+    background-color: var(--table-header-background-color, #fafafa);
+    display: block;
+    font-family: var(--font-family);
+  }
+  #header {
+    align-items: center;
+    border-bottom: 1px solid var(--border-color, #ddd);
+    border-top: 1px solid var(--border-color, #ddd);
+    display: inline-flex;
+    padding: .5em;
+    width: 100%;
+  }
+  h3 {
+    padding: 0 .5em;
+  }
+  #dropdown {
+    background-color: var(--view-background-color);
+    border: 1px solid var(--border-color);
+    border-radius: 2px;
+    color: var(--primary-text-color);
+    font-size: var(--font-size-normal);
+    height: 2em;
+    margin-left: 1em;
+    padding: 0 .15em;
+  }
+  .diffmode {
+    align-items: center;
+    display: flex;
+    justify-content: center;
+  }
+</style>
+<div id="header">
+  <h3>Image diff</h3>
+  <select value="{{_observeMode::change}}" id="dropdown">
+    <option value="resemble" title="Scale the images to the same size and compute a diff with highlights">Highlight differences</option>
+    <option value="opacity" title="Overlay the new image over the old and use an opacity control to view the differences">Onion skin</option>
+  </select>
+</div>
+<div class="diffmode">
+  <template is="dom-if" if="[[_showResembleMode]]" restamp="true">
+    <gr-resemble-diff-mode
+        base-image="[[baseImage]]"
+        revision-image="[[revisionImage]]"></gr-resemble-diff-mode>
+  </template>
+</div>
+<div class="diffmode">
+  <template is="dom-if" if="[[_showOpacityMode]]" restamp="true">
+    <gr-opacity-diff-mode
+        base-image="[[baseImage]]"
+        revision-image="[[revisionImage]]"></gr-opacity-diff-mode>
+  </template>
+</div>`;
\ No newline at end of file
diff --git a/gr-image-diff-tool/gr-image-diff-tool_test.html b/gr-image-diff-tool/gr-image-diff-tool_test.html
index 645422a..58905f7 100644
--- a/gr-image-diff-tool/gr-image-diff-tool_test.html
+++ b/gr-image-diff-tool/gr-image-diff-tool_test.html
@@ -15,18 +15,12 @@
 -->
 
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
+<meta charset="utf-8">
 <title>image-diff-tool</title>
-
-<link rel="import" href="../node_modules/polymer/polymer.html">
-<link rel="import" href="../node_modules/@polymer/test-fixture/test-fixture.html">
-<link rel="import" href="../node_modules/iron-test-helpers/iron-test-helpers.html">
-<link rel="import" href="./gr-image-diff-tool.html">
-
-<script>void(0);</script>
-
-<script src="../node_modules/webcomponents.js/webcomponents-lite.min.js"></script>
-<script src="../node_modules/web-component-tester/browser.js"></script>
-<script src="../node_modules/@polymer/sinonjs/sinon.js"></script>
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
+<script src="../node_modules/resemblejs/resemble.js"></script>
 
 <test-fixture id="basicFixture">
   <template>
@@ -35,7 +29,9 @@
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import "./gr-image-diff-tool.js";
   suite('gr-image-diff-tool tests', () => {
     let element;
     let sandbox;
@@ -54,8 +50,8 @@
       assert.isFalse(element._showResembleMode);
       flushAsynchronousOperations();
 
-      assert.ok(element.$$('gr-opacity-diff-mode'));
-      assert.equal(element.$$('gr-resemble-diff-mode'), null);
+      assert.ok(element.shadowRoot.querySelector('gr-opacity-diff-mode'));
+      assert.equal(element.shadowRoot.querySelector('gr-resemble-diff-mode'), null);
     });
 
     test('test resemble mode', () => {
@@ -64,14 +60,14 @@
       assert.isFalse(element._showOpacityMode);
       flushAsynchronousOperations();
 
-      assert.ok(element.$$('gr-resemble-diff-mode'));
-      assert.equal(element.$$('gr-opacity-diff-mode'), null);
+      assert.ok(element.shadowRoot.querySelector('gr-resemble-diff-mode'));
+      assert.equal(element.shadowRoot.querySelector('gr-opacity-diff-mode'), null);
     });
 
     test('localStorage persists', () => {
       sandbox.stub(element, '_setMode');
       sandbox.stub(element, '_getMode');
-      element.attached();
+      element.connectedCallback();
       assert.equal(element._getMode.callCount, 1);
       assert.equal(element._setMode.callCount, 1);
       element._observeMode = 'opacity';
diff --git a/gr-opacity-diff-mode/gr-opacity-diff-mode.js b/gr-opacity-diff-mode/gr-opacity-diff-mode.js
index a0c906f..28b8957 100644
--- a/gr-opacity-diff-mode/gr-opacity-diff-mode.js
+++ b/gr-opacity-diff-mode/gr-opacity-diff-mode.js
@@ -1,22 +1,32 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-(function() {
-  'use strict';
-  Polymer({
-    is: 'gr-opacity-diff-mode',
+/**
+ * @license
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {htmlTemplate} from './gr-opacity-diff-mode_html.js';
 
-    properties: {
+class OpacityDiffMode extends Polymer.Element {
+  static get is() {
+    return 'gr-opacity-diff-mode';
+  }
+
+  static get template() {
+    return htmlTemplate;
+  }
+
+  static get properties() {
+    return {
       baseImage: Object,
       revisionImage: Object,
       opacityValue: Number,
@@ -28,59 +38,73 @@
         type: Number,
         value: 0,
       },
-    },
+    };
+  }
 
-    observers: [
+  static get observers() {
+    return [
       '_handleImageChange(baseImage, revisionImage)',
       '_handleHeightChange(_maxHeight)',
       '_handleWidthChange(_maxWidth)',
-    ],
+    ];
+  }
 
-    _onImageLoad(e) {
-      this._maxHeight = Math.max(this._maxHeight,
-          Polymer.dom(e).rootTarget.naturalHeight);
-      this._maxWidth = Math.max(this._maxWidth,
-          Polymer.dom(e).rootTarget.naturalWidth);
-    },
+  _onImageLoad(e) {
+    this._maxHeight = Math.max(
+        this._maxHeight,
+        Polymer.dom(e).rootTarget.naturalHeight
+    );
+    this._maxWidth = Math.max(
+        this._maxWidth,
+        Polymer.dom(e).rootTarget.naturalWidth
+    );
+  }
 
-    _handleImageChange(baseImage, revisionImage) {
-      this.$.imageRevision.setAttribute('src',
-          this.computeSrcString(this.revisionImage));
-      this.$.imageBase.setAttribute('src',
-          this.computeSrcString(this.baseImage));
-      this.handleOpacityChange();
-    },
+  _handleImageChange(baseImage, revisionImage) {
+    if ([baseImage, revisionImage].includes(undefined)) return;
+    this.$.imageRevision.setAttribute(
+        'src',
+        this.computeSrcString(revisionImage)
+    );
+    this.$.imageBase.setAttribute('src', this.computeSrcString(baseImage));
+    this.handleOpacityChange();
+  }
 
-    handleOpacityChange() {
-      this.updateStyles({'--my-opacity-value': this.$.opacitySlider.value});
-    },
+  handleOpacityChange() {
+    this.updateStyles({'--my-opacity-value': this.$.opacitySlider.value});
+  }
 
-    computeSrcString(image) {
-      return 'data:' + image['type'] + ';base64, ' + image['body'];
-    },
+  computeSrcString(image) {
+    return 'data:' + image['type'] + ';base64, ' + image['body'];
+  }
 
-    handleScaleSizesToggle() {
-      let width;
-      let height;
-      if (this.$.scaleSizesToggle.checked) {
-        width = this._maxWidth;
-        height = this._maxHeight;
-      }
+  handleScaleSizesToggle() {
+    let width;
+    let height;
+    if (this.$.scaleSizesToggle.checked) {
+      width = this._maxWidth;
+      height = this._maxHeight;
+    }
 
-      this.updateStyles({
-        '--img-width': width ? width + 'px' : null,
-        '--img-height': height ? height + 'px' : null,
-      });
-    },
+    this.updateStyles({
+      '--img-width': width ? width + 'px' : null,
+      '--img-height': height ? height + 'px' : null,
+    });
+  }
 
-    _handleHeightChange(height) {
-      if (!height) { return; }
-      this.updateStyles({'--div-height': `${height}px`});
-    },
+  _handleHeightChange(height) {
+    if (!height) {
+      return;
+    }
+    this.updateStyles({'--div-height': `${height}px`});
+  }
 
-    _handleWidthChange(width) {
-      if (!width) { return; }
-      this.updateStyles({'--div-width': `${width}px`});
-    },
-  });
-})();
+  _handleWidthChange(width) {
+    if (!width) {
+      return;
+    }
+    this.updateStyles({'--div-width': `${width}px`});
+  }
+}
+
+customElements.define(OpacityDiffMode.is, OpacityDiffMode);
diff --git a/gr-opacity-diff-mode/gr-opacity-diff-mode.html b/gr-opacity-diff-mode/gr-opacity-diff-mode_html.js
similarity index 69%
rename from gr-opacity-diff-mode/gr-opacity-diff-mode.html
rename to gr-opacity-diff-mode/gr-opacity-diff-mode_html.js
index bd0db70..6aacd55 100644
--- a/gr-opacity-diff-mode/gr-opacity-diff-mode.html
+++ b/gr-opacity-diff-mode/gr-opacity-diff-mode_html.js
@@ -1,21 +1,21 @@
-<!--
-Copyright (C) 2018 The Android Open Source Project
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
--->
-
-<dom-module id="gr-opacity-diff-mode">
-  <template>
+export const htmlTemplate = Polymer.html`
     <style>
       :host {
         display: block;
@@ -73,7 +73,7 @@
           <label>
             <input
                 id="scaleSizesToggle"
-                on-tap="handleScaleSizesToggle"
+                on-click="handleScaleSizesToggle"
                 type="checkbox">
             Scale to same size
           </label>
@@ -90,7 +90,4 @@
           </label>
         </div>
       </div>
-    </div>
-  </template>
-  <script src="gr-opacity-diff-mode.js"></script>
-</dom-module>
+    </div>`;
\ No newline at end of file
diff --git a/gr-opacity-diff-mode/gr-opacity-diff-mode_test.html b/gr-opacity-diff-mode/gr-opacity-diff-mode_test.html
index 7ea09c5..d1fc5ed 100644
--- a/gr-opacity-diff-mode/gr-opacity-diff-mode_test.html
+++ b/gr-opacity-diff-mode/gr-opacity-diff-mode_test.html
@@ -13,18 +13,11 @@
 limitations under the License.
 -->
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
+<meta charset="utf-8">
 <title>gr-opacity-diff-mode</title>
-
-<link rel="import" href="../node_modules/polymer/polymer.html">
-<link rel="import" href="../node_modules/@polymer/test-fixture/test-fixture.html">
-<link rel="import" href="../node_modules/iron-test-helpers/iron-test-helpers.html">
-<link rel="import" href="./gr-opacity-diff-mode.html">
-
-<script>void(0);</script>
-
-<script src="../node_modules/webcomponents.js/webcomponents-lite.min.js"></script>
-<script src="../node_modules/web-component-tester/browser.js"></script>
-<script src="../node_modules/@polymer/sinonjs/sinon.js"></script>
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <test-fixture id='opacity-diff-fixture'>
   <template>
@@ -32,7 +25,9 @@
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import "./gr-opacity-diff-mode.js";
   function getComputedStyleValue(name, el) {
     let style;
     if (window.ShadyCSS) {
diff --git a/gr-resemble-diff-mode/gr-resemble-diff-mode.js b/gr-resemble-diff-mode/gr-resemble-diff-mode.js
index 1e94c06..f7dec89 100644
--- a/gr-resemble-diff-mode/gr-resemble-diff-mode.js
+++ b/gr-resemble-diff-mode/gr-resemble-diff-mode.js
@@ -1,28 +1,37 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {htmlTemplate} from './gr-resemble-diff-mode_html.js';
 
-  const DEFAULT_SETTING = {
-    errorType: 'flat',
-    largeImageThreshold: 1200,
-  };
+const DEFAULT_SETTING = {
+  errorType: 'flat',
+  largeImageThreshold: 1200,
+};
 
-  Polymer({
-    is: 'gr-resemble-diff-mode',
+class ResembleDiffMode extends Polymer.Element {
+  static get is() {
+    return 'gr-resemble-diff-mode';
+  }
 
-    properties: {
+  static get template() {
+    return htmlTemplate;
+  }
+
+  static get properties() {
+    return {
       baseImage: Object,
       revisionImage: Object,
       _colorValue: {
@@ -47,119 +56,140 @@
         value: false,
         reflectToAttribute: true,
       },
-    },
+    };
+  }
 
-    observers: [
-      '_handleImageDiff(baseImage, revisionImage)',
-    ],
+  static get observers() {
+    return ['_handleImageDiff(baseImage, revisionImage)'];
+  }
 
-    attached() {
-      window.resemble.outputSettings(DEFAULT_SETTING);
-    },
+  connectedCallback() {
+    super.connectedCallback();
+    window.resemble.outputSettings(DEFAULT_SETTING);
+  }
 
-    _handleImageDiff() {
-      this.reload();
-    },
+  _handleImageDiff(baseImage, revisionImage) {
+    if ([baseImage, revisionImage].includes(undefined)) {
+      return;
+    }
+    this.reload();
+  }
 
-    _setImageDiffSrc(src) {
-      delete this.$.imageDiff.src;
-      this.$.imageDiff.src = src;
-    },
+  _setImageDiffSrc(src) {
+    delete this.$.imageDiff.src;
+    this.$.imageDiff.src = src;
+  }
 
-    _setDifferenceValue(percentage) {
-      this._difference = percentage;
-    },
+  _setDifferenceValue(percentage) {
+    this._difference = percentage;
+  }
 
-    _getDataUrl(image) {
-      return 'data:' + image['type'] + ';base64,' + image['body'];
-    },
+  _getDataUrl(image) {
+    return 'data:' + image['type'] + ';base64,' + image['body'];
+  }
 
-    _maybeIgnoreColors(diffProcess, ignoreColors) {
-      ignoreColors ? diffProcess.ignoreColors() : diffProcess.ignoreNothing();
-      return diffProcess;
-    },
+  _maybeIgnoreColors(diffProcess, ignoreColors) {
+    ignoreColors ? diffProcess.ignoreColors() : diffProcess.ignoreNothing();
+    return diffProcess;
+  }
 
-    _createDiffProcess(base, rev, ignoreColors) {
-      window.resemble.outputSettings(this._setOutputSetting());
-      const process = window.resemble(base).compareTo(rev);
-      return this._maybeIgnoreColors(process, ignoreColors);
-    },
+  _createDiffProcess(base, rev, ignoreColors) {
+    window.resemble.outputSettings(this._setOutputSetting());
+    const process = window.resemble(base).compareTo(rev);
+    return this._maybeIgnoreColors(process, ignoreColors);
+  }
 
-    _setOutputSetting() {
-      const rgb = this._hexToRGB(this._colorValue);
-      return {
-        transparency: this._transparent ? 0.1 : 1,
-        errorColor: {
-          red: rgb.r,
-          green: rgb.g,
-          blue: rgb.b,
-        },
-      };
-    },
+  _setOutputSetting() {
+    const rgb = this._hexToRGB(this._colorValue);
+    return {
+      transparency: this._transparent ? 0.1 : 1,
+      errorColor: {
+        red: rgb.r,
+        green: rgb.g,
+        blue: rgb.b,
+      },
+    };
+  }
 
-    /**
-     * Reloads the diff. Resemble 1.2.1 seems to have an issue with successive
-     * reloads via the repaint() function, so this implementation creates a
-     * fresh diff each time it is called.
-     *
-     * @return {Promise} resolves if and when the reload succeeds.
-     */
-    reload() {
-      this.loading = true;
-      if (this.baseImage && this.revisionImage) {
-        const base = this._getDataUrl(this.baseImage);
-        const rev = this._getDataUrl(this.revisionImage);
+  /**
+   * Reloads the diff. Resemble 1.2.1 seems to have an issue with successive
+   * reloads via the repaint() function, so this implementation creates a
+   * fresh diff each time it is called.
+   *
+   * @return {Promise} resolves if and when the reload succeeds.
+   */
+  reload() {
+    this.loading = true;
+    if (this.baseImage && this.revisionImage) {
+      const base = this._getDataUrl(this.baseImage);
+      const rev = this._getDataUrl(this.revisionImage);
 
-        return new Promise((resolve, reject) => {
-          this._createDiffProcess(base, rev, this._ignoreColors)
-              .onComplete(data => {
-                this._setImageDiffSrc(data.getImageDataUrl());
-                this._setDifferenceValue(data.misMatchPercentage);
-                this.loading = false;
-                resolve();
-              });
-        });
-      }
-      this.loading = false;
-    },
+      return new Promise((resolve, reject) => {
+        this._createDiffProcess(base, rev, this._ignoreColors).onComplete(
+            data => {
+              this._setImageDiffSrc(data.getImageDataUrl());
+              this._setDifferenceValue(data.misMatchPercentage);
+              this.loading = false;
+              resolve();
+            }
+        );
+      });
+    }
+    this.loading = false;
+  }
 
-    // The use of debounce is to prevent the user from repeatedly calling the
-    // functions in a short amount of time.
-    _handleIgnoreColorsToggle() {
-      this.debounce('ignore-colors-toggle', () => {
-        this._ignoreColors = !this._ignoreColors;
-        this.reload();
-      }, 1);
-    },
+  // The use of debounce is to prevent the user from repeatedly calling the
+  // functions in a short amount of time.
+  _handleIgnoreColorsToggle() {
+    this._ignoreColorsToggleJob = Polymer.Debouncer.debounce(
+        this._ignoreColorsToggleJob,
+        Polymer.Async.timeOut.after(1),
+        () => {
+          this._ignoreColors = !this._ignoreColors;
+          this.reload();
+        }
+    );
+  }
 
-    _handleTransparentToggle() {
-      this.debounce('transparent-toggle', () => {
-        this._transparent = !this._transparent;
-        this.reload();
-      }, 1);
-    },
+  _handleTransparentToggle() {
+    this._transparentToggleJob = Polymer.Debouncer.debounce(
+        this._transparentToggleJob,
+        Polymer.Async.timeOut.after(1),
+        () => {
+          this._transparent = !this._transparent;
+          this.reload();
+        }
+    );
+  }
 
-    // The wait time of 5 ms allows users to see the color change in the image
-    // diff relatively close to real time. Any larger wait time will not allow
-    // the color to show up immediately on the image diff.
-    _handleColorChange() {
-      this.debounce('color-change', () => {
-        this.reload();
-      }, 5);
-    },
+  // The wait time of 5 ms allows users to see the color change in the image
+  // diff relatively close to real time. Any larger wait time will not allow
+  // the color to show up immediately on the image diff.
+  _handleColorChange() {
+    this._colorChangeJob = Polymer.Debouncer.debounce(
+        this._colorChangeJob,
+        Polymer.Async.timeOut.after(5),
+        () => {
+          this.reload();
+        }
+    );
+  }
 
-    _hexToRGB(hex) {
-      const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
-      return result ? {
+  _hexToRGB(hex) {
+    const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+    return result
+      ? {
         r: parseInt(result[1], 16),
         g: parseInt(result[2], 16),
         b: parseInt(result[3], 16),
-      } : null;
-    },
+      }
+      : null;
+  }
 
-    _handleFullScreen() {
-      const w = window.open('about:blank', '_blank');
-      w.document.body.innerHTML = this.$.imageDiff.outerHTML;
-    },
-  });
-})();
+  _handleFullScreen() {
+    const w = window.open('about:blank', '_blank');
+    w.document.body.innerHTML = this.$.imageDiff.outerHTML;
+  }
+}
+
+customElements.define(ResembleDiffMode.is, ResembleDiffMode);
\ No newline at end of file
diff --git a/gr-resemble-diff-mode/gr-resemble-diff-mode.html b/gr-resemble-diff-mode/gr-resemble-diff-mode_html.js
similarity index 70%
rename from gr-resemble-diff-mode/gr-resemble-diff-mode.html
rename to gr-resemble-diff-mode/gr-resemble-diff-mode_html.js
index b9f3315..31188d8 100644
--- a/gr-resemble-diff-mode/gr-resemble-diff-mode.html
+++ b/gr-resemble-diff-mode/gr-resemble-diff-mode_html.js
@@ -1,22 +1,21 @@
-<!--
-Copyright (C) 2018 The Android Open Source Project
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
--->
-
-<script src="../bower_components/resemblejs/resemble.js"></script>
-<dom-module id="gr-resemble-diff-mode">
-  <template>
+export const htmlTemplate = Polymer.html`
     <style>
       :host {
         display: block;
@@ -91,7 +90,7 @@
               id="ignoreColorsToggle"
               type="checkbox"
               checked$="[[_ignoreColors]]"
-              on-tap="_handleIgnoreColorsToggle">
+              on-click="_handleIgnoreColorsToggle">
           Ignore colors
         </label>
         <label class="toggle">
@@ -99,7 +98,7 @@
               id="transparentToggle"
               type="checkbox"
               checked$="[[_transparent]]"
-              on-tap="_handleTransparentToggle">
+              on-click="_handleTransparentToggle">
           Transparent
         </label>
         <input
@@ -108,11 +107,8 @@
             value="{{_colorValue::change}}">
         <button
             id="fullscreen"
-            on-tap="_handleFullScreen">
+            on-click="_handleFullScreen">
           View full sized
         </button>
       </div>
-    </div>
-  </template>
-  <script src="gr-resemble-diff-mode.js"></script>
-</dom-module>
+    </div>`;
diff --git a/gr-resemble-diff-mode/gr-resemble-diff-mode_test.html b/gr-resemble-diff-mode/gr-resemble-diff-mode_test.html
index 280693d..43e928b 100644
--- a/gr-resemble-diff-mode/gr-resemble-diff-mode_test.html
+++ b/gr-resemble-diff-mode/gr-resemble-diff-mode_test.html
@@ -15,18 +15,12 @@
 -->
 
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
+<meta charset="utf-8">
 <title>resemble-diff-mode</title>
-
-<link rel="import" href="../node_modules/polymer/polymer.html">
-<link rel="import" href="../node_modules/@polymer/test-fixture/test-fixture.html">
-<link rel="import" href="../node_modules/iron-test-helpers/iron-test-helpers.html">
-<link rel="import" href="./gr-resemble-diff-mode.html">
-
-<script>void(0);</script>
-
-<script src="../node_modules/webcomponents.js/webcomponents-lite.min.js"></script>
-<script src="../node_modules/web-component-tester/browser.js"></script>
-<script src="../node_modules/@polymer/sinonjs/sinon.js"></script>
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
+<script src="../node_modules/resemblejs/resemble.js"></script>
 
 <test-fixture id="basicFixture">
   <template>
@@ -35,7 +29,9 @@
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import "./gr-resemble-diff-mode.js";
   suite('gr-resemble-diff-mode tests', () => {
     let element;
     let sandbox;
@@ -103,7 +99,7 @@
       element._ignoreColors = false;
       assert.isFalse(element.$.ignoreColorsToggle.checked);
       MockInteractions.tap(element.$.ignoreColorsToggle);
-      element.flushDebouncer('ignore-colors-toggle');
+      element._ignoreColorsToggleJob.flush();
       flushAsynchronousOperations();
 
       assert.isTrue(element._ignoreColors);
@@ -115,7 +111,7 @@
       element._transparent = false;
       assert.isFalse(element.$.transparentToggle.checked);
       MockInteractions.tap(element.$.transparentToggle);
-      element.flushDebouncer('transparent-toggle');
+      element._transparentToggleJob.flush();
       flushAsynchronousOperations();
 
       assert.isTrue(element._transparent);
@@ -125,7 +121,7 @@
     test('_handleColorChange', () => {
       sandbox.stub(element, 'reload');
       element._colorValue = '';
-      element.flushDebouncer('color-change');
+      element._colorChangeJob.flush();
       flushAsynchronousOperations();
 
       assert.isTrue(element.reload.called);
@@ -155,10 +151,10 @@
       element.revisionImage = {};
       assert.equal(element.reload.callCount, 1);
       MockInteractions.tap(element.$.ignoreColorsToggle);
-      element.flushDebouncer('ignore-colors-toggle');
+      element._ignoreColorsToggleJob.flush();
       assert.equal(element.reload.callCount, 2);
       MockInteractions.tap(element.$.transparentToggle);
-      element.flushDebouncer('transparent-toggle');
+      element._transparentToggleJob.flush();
       assert.equal(element.reload.callCount, 3);
     });
   });
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..d1f516c
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2242 @@
+{
+    "name": "image-diff",
+    "requires": true,
+    "lockfileVersion": 1,
+    "dependencies": {
+        "@babel/code-frame": {
+            "version": "7.10.1",
+            "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.1.tgz",
+            "integrity": "sha512-IGhtTmpjGbYzcEDOw7DcQtbQSXcG9ftmAXtWTu9V936vDye4xjjekktFAtgZsWpzTj/X01jocB46mTywm/4SZw==",
+            "dev": true,
+            "requires": {
+                "@babel/highlight": "^7.10.1"
+            }
+        },
+        "@babel/helper-validator-identifier": {
+            "version": "7.10.1",
+            "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.1.tgz",
+            "integrity": "sha512-5vW/JXLALhczRCWP0PnFDMCJAchlBvM7f4uk/jXritBnIa6E1KmqmtrS3yn1LAnxFBypQ3eneLuXjsnfQsgILw==",
+            "dev": true
+        },
+        "@babel/highlight": {
+            "version": "7.10.1",
+            "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.1.tgz",
+            "integrity": "sha512-8rMof+gVP8mxYZApLF/JgNDAkdKa+aJt3ZYxF8z6+j/hpeXL7iMsKCPHa2jNMHu/qqBwzQF4OHNoYi8dMA/rYg==",
+            "dev": true,
+            "requires": {
+                "@babel/helper-validator-identifier": "^7.10.1",
+                "chalk": "^2.0.0",
+                "js-tokens": "^4.0.0"
+            }
+        },
+        "@polymer/iron-test-helpers": {
+            "version": "3.0.1",
+            "resolved": "https://registry.npmjs.org/@polymer/iron-test-helpers/-/iron-test-helpers-3.0.1.tgz",
+            "integrity": "sha512-2R7dnGcW2eg95i7LhYWWUO4AlAk6qXsPnKoyeN2R1t0km0ECMx0jjwqeLwCo8/7LwuVPZSiarI4DK7jyU7fJLQ==",
+            "dev": true,
+            "requires": {
+                "@polymer/polymer": "^3.0.0"
+            }
+        },
+        "@polymer/polymer": {
+            "version": "3.4.1",
+            "resolved": "https://registry.npmjs.org/@polymer/polymer/-/polymer-3.4.1.tgz",
+            "integrity": "sha512-KPWnhDZibtqKrUz7enIPOiO4ZQoJNOuLwqrhV2MXzIt3VVnUVJVG5ORz4Z2sgO+UZ+/UZnPD0jqY+jmw/+a9mQ==",
+            "dev": true,
+            "requires": {
+                "@webcomponents/shadycss": "^1.9.1"
+            }
+        },
+        "@types/color-name": {
+            "version": "1.1.1",
+            "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+            "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+            "dev": true
+        },
+        "@types/json5": {
+            "version": "0.0.29",
+            "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
+            "integrity": "sha1-7ihweulOEdK4J7y+UnC86n8+ce4=",
+            "dev": true
+        },
+        "@webcomponents/shadycss": {
+            "version": "1.10.0",
+            "resolved": "https://registry.npmjs.org/@webcomponents/shadycss/-/shadycss-1.10.0.tgz",
+            "integrity": "sha512-UMS+dF4DXDrcUmQqK6aLd/3mFyfGktKG/hZR6FtrsQK/INO07G0H8FxElLkuvHj0iePeZGpR7R4lWFTvX7rc9g==",
+            "dev": true
+        },
+        "abbrev": {
+            "version": "1.1.1",
+            "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+            "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+            "dev": true
+        },
+        "acorn": {
+            "version": "7.3.1",
+            "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
+            "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
+            "dev": true
+        },
+        "acorn-jsx": {
+            "version": "5.2.0",
+            "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
+            "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
+            "dev": true
+        },
+        "ajv": {
+            "version": "6.12.2",
+            "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
+            "integrity": "sha512-k+V+hzjm5q/Mr8ef/1Y9goCmlsK4I6Sm74teeyGvFk1XrOsbsKLjEdrvny42CZ+a8sXbk8KWpY/bDwS+FLL2UQ==",
+            "dev": true,
+            "requires": {
+                "fast-deep-equal": "^3.1.1",
+                "fast-json-stable-stringify": "^2.0.0",
+                "json-schema-traverse": "^0.4.1",
+                "uri-js": "^4.2.2"
+            }
+        },
+        "ansi-escapes": {
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+            "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
+            "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
+            "dev": true,
+            "requires": {
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+            },
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+                "type-fest": {
+                    "version": "0.11.0",
+                    "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+                    "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+                    "dev": true
+                }
+            }
+        },
+        "ansi-regex": {
+            "version": "2.1.1",
+            "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+            "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+            "dev": true
+        },
+        "ansi-styles": {
+            "version": "3.2.1",
+            "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+            "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+            "dev": true,
+            "requires": {
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+            }
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+        "aproba": {
+            "version": "1.2.0",
+            "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+            "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
+            "dev": true
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+        "are-we-there-yet": {
+            "version": "1.1.5",
+            "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+            "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+            "dev": true,
+            "requires": {
+                "delegates": "^1.0.0",
+                "readable-stream": "^2.0.6"
+            }
+        },
+        "argparse": {
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+            "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
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+            "dev": true,
+            "requires": {
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+            }
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+        "array-includes": {
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+            "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.1.1.tgz",
+            "integrity": "sha512-c2VXaCHl7zPsvpkFsw4nxvFie4fh1ur9bpcgsVkIjqn0H/Xwdg+7fv3n2r/isyS8EBj5b06M9kHyZuIr4El6WQ==",
+            "dev": true,
+            "requires": {
+                "define-properties": "^1.1.3",
+                "es-abstract": "^1.17.0",
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+            "requires": {
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+                "es-abstract": "^1.17.0-next.1"
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+            "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
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+            "dev": true,
+            "requires": {
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+                "concat-map": "0.0.1"
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+            "requires": {
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+                "node-pre-gyp": "^0.11.0",
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+            "requires": {
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+                "escape-string-regexp": "^1.0.5",
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+            "requires": {
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+            "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+            "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+            "dev": true
+        },
+        "strip-json-comments": {
+            "version": "2.0.1",
+            "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+            "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+            "dev": true
+        },
+        "supports-color": {
+            "version": "5.5.0",
+            "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+            "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+            "dev": true,
+            "requires": {
+                "has-flag": "^3.0.0"
+            }
+        },
+        "table": {
+            "version": "5.4.6",
+            "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+            "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+            "dev": true,
+            "requires": {
+                "ajv": "^6.10.2",
+                "lodash": "^4.17.14",
+                "slice-ansi": "^2.1.0",
+                "string-width": "^3.0.0"
+            },
+            "dependencies": {
+                "ansi-regex": {
+                    "version": "4.1.0",
+                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+                    "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+                    "dev": true
+                },
+                "emoji-regex": {
+                    "version": "7.0.3",
+                    "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+                    "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+                    "dev": true
+                },
+                "is-fullwidth-code-point": {
+                    "version": "2.0.0",
+                    "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+                    "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+                    "dev": true
+                },
+                "string-width": {
+                    "version": "3.1.0",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+                    "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+                    "dev": true,
+                    "requires": {
+                        "emoji-regex": "^7.0.1",
+                        "is-fullwidth-code-point": "^2.0.0",
+                        "strip-ansi": "^5.1.0"
+                    }
+                },
+                "strip-ansi": {
+                    "version": "5.2.0",
+                    "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+                    "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+                    "dev": true,
+                    "requires": {
+                        "ansi-regex": "^4.1.0"
+                    }
+                }
+            }
+        },
+        "tar": {
+            "version": "4.4.13",
+            "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.13.tgz",
+            "integrity": "sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==",
+            "dev": true,
+            "requires": {
+                "chownr": "^1.1.1",
+                "fs-minipass": "^1.2.5",
+                "minipass": "^2.8.6",
+                "minizlib": "^1.2.1",
+                "mkdirp": "^0.5.0",
+                "safe-buffer": "^5.1.2",
+                "yallist": "^3.0.3"
+            }
+        },
+        "text-table": {
+            "version": "0.2.0",
+            "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+            "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+            "dev": true
+        },
+        "through": {
+            "version": "2.3.8",
+            "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+            "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+            "dev": true
+        },
+        "tmp": {
+            "version": "0.0.33",
+            "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+            "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+            "dev": true,
+            "requires": {
+                "os-tmpdir": "~1.0.2"
+            }
+        },
+        "tsconfig-paths": {
+            "version": "3.9.0",
+            "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz",
+            "integrity": "sha512-dRcuzokWhajtZWkQsDVKbWyY+jgcLC5sqJhg2PSgf4ZkH2aHPvaOY8YWGhmjb68b5qqTfasSsDO9k7RUiEmZAw==",
+            "dev": true,
+            "requires": {
+                "@types/json5": "^0.0.29",
+                "json5": "^1.0.1",
+                "minimist": "^1.2.0",
+                "strip-bom": "^3.0.0"
+            }
+        },
+        "tslib": {
+            "version": "1.13.0",
+            "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+            "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+            "dev": true
+        },
+        "type-check": {
+            "version": "0.3.2",
+            "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+            "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+            "dev": true,
+            "requires": {
+                "prelude-ls": "~1.1.2"
+            }
+        },
+        "type-fest": {
+            "version": "0.8.1",
+            "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+            "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+            "dev": true
+        },
+        "uri-js": {
+            "version": "4.2.2",
+            "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+            "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+            "dev": true,
+            "requires": {
+                "punycode": "^2.1.0"
+            }
+        },
+        "util-deprecate": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+            "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+            "dev": true
+        },
+        "v8-compile-cache": {
+            "version": "2.1.1",
+            "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.1.tgz",
+            "integrity": "sha512-8OQ9CL+VWyt3JStj7HX7/ciTL2V3Rl1Wf5OL+SNTm0yK1KvtReVulksyeRnCANHHuUxHlQig+JJDlUhBt1NQDQ==",
+            "dev": true
+        },
+        "validate-npm-package-license": {
+            "version": "3.0.4",
+            "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+            "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+            "dev": true,
+            "requires": {
+                "spdx-correct": "^3.0.0",
+                "spdx-expression-parse": "^3.0.0"
+            }
+        },
+        "which": {
+            "version": "1.3.1",
+            "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+            "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+            "dev": true,
+            "requires": {
+                "isexe": "^2.0.0"
+            }
+        },
+        "wide-align": {
+            "version": "1.1.3",
+            "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+            "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+            "dev": true,
+            "requires": {
+                "string-width": "^1.0.2 || 2"
+            }
+        },
+        "word-wrap": {
+            "version": "1.2.3",
+            "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+            "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+            "dev": true
+        },
+        "wrappy": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+            "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+            "dev": true
+        },
+        "write": {
+            "version": "1.0.3",
+            "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+            "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+            "dev": true,
+            "requires": {
+                "mkdirp": "^0.5.1"
+            }
+        },
+        "yallist": {
+            "version": "3.1.1",
+            "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+            "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
+            "dev": true
+        }
+    }
+}
diff --git a/package.json b/package.json
index 5537196..0d98a86 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,27 @@
 {
-  "license": "Apache-2.0",
-  "dependencies": {
-    "polymer": "Polymer/polymer#^1.0.0",
-    "resemblejs": "1.2.1",
-    "webcomponents.js": "webcomponents/webcomponentsjs#^0.7.0"
-  },
-  "devDependencies": {
-    "iron-test-helpers": "PolymerElements/iron-test-helpers#^2.0.0",
-    "web-component-tester": "Polymer/web-component-tester#^6.0.0"
-  }
+    "name": "image-diff",
+    "browser": true,
+    "scripts": {
+        "test": "polymer serve",
+        "eslint": "npx eslint --ext .js ./",
+        "eslintfix": "npm run eslint -- --fix",
+        "wct-test": "npm i && npx bower i && npx polymer test -l chrome"
+    },
+    "dependencies": {
+        "resemblejs": "^3.2.4"
+    },
+    "devDependencies": {
+        "@polymer/iron-test-helpers": "^3.0.1",
+        "@webcomponents/webcomponentsjs": "^1.3.3",
+        "bower": "^1.8.8",
+        "es6-promise": "^3.3.1",
+        "eslint": "^6.6.0",
+        "eslint-config-google": "^0.13.0",
+        "eslint-plugin-html": "^6.0.0",
+        "eslint-plugin-import": "^2.20.1",
+        "eslint-plugin-jsdoc": "^19.2.0",
+        "polymer-bridges": "file:../../polymer-bridges/"
+    },
+    "license": "Apache-2.0",
+    "private": true
 }
diff --git a/plugin.html b/plugin.html
deleted file mode 100644
index b219f42..0000000
--- a/plugin.html
+++ /dev/null
@@ -1,24 +0,0 @@
-<!--
-Copyright (C) 2018 The Android Open Source Project
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
--->
-<link rel="import" href="./gr-image-diff-tool/gr-image-diff-tool.html">
-
-<dom-module id="image-diff">
-  <script>
-    Gerrit.install(plugin => {
-      plugin.registerCustomComponent('image-diff', 'gr-image-diff-tool');
-    });
-  </script>
-</dom-module>
\ No newline at end of file
diff --git a/plugin.js b/plugin.js
new file mode 100644
index 0000000..83c7b61
--- /dev/null
+++ b/plugin.js
@@ -0,0 +1,23 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'resemblejs/resemble.js'; // eslint-disable-line
+import './gr-image-diff-tool/gr-image-diff-tool.js';
+
+Gerrit.install(plugin => {
+  plugin.registerCustomComponent('image-diff', 'gr-image-diff-tool');
+});
\ No newline at end of file
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..b41d6aa
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+const path = require('path');
+
+function requirePlugin(id) {
+  const rollupBinDir = path.dirname(process.argv[1]);
+  const pluginPath = require.resolve(id, {paths: [__dirname, rollupBinDir]});
+  return require(pluginPath);
+}
+const resolve = requirePlugin('rollup-plugin-node-resolve');
+
+export default {  // eslint-disable-line
+  treeshake: false,
+  // This is required for resemblejs
+  context: 'window',
+  output: {
+    format: 'iife',
+    compact: true,
+  },
+  plugins: [resolve({
+    customResolveOptions: {
+      moduleDirectory: 'external/plugins_npm/node_modules',
+    },
+  })],
+};
diff --git a/test/common-test-setup.js b/test/common-test-setup.js
new file mode 100644
index 0000000..f460703
--- /dev/null
+++ b/test/common-test-setup.js
@@ -0,0 +1,60 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* eslint-disable */
+import 'polymer-bridges/polymer/lib/utils/boot_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/resolve-url_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/settings_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/mixin_bridge.js';
+import 'polymer-bridges/polymer/lib/elements/dom-module_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/style-gather_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/path_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/case-map_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/async_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/wrap_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/properties-changed_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/property-accessors_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/template-stamp_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/property-effects_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/telemetry_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/properties-mixin_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/debounce_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/gestures_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/gesture-event-listeners_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/dir-mixin_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/render-status_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/unresolved_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/array-splice_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/flattened-nodes-observer_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/flush_bridge.js';
+import 'polymer-bridges/polymer/lib/legacy/polymer.dom_bridge.js';
+import 'polymer-bridges/polymer/lib/legacy/legacy-element-mixin_bridge.js';
+import 'polymer-bridges/polymer/lib/legacy/class_bridge.js';
+import 'polymer-bridges/polymer/lib/legacy/polymer-fn_bridge.js';
+import 'polymer-bridges/polymer/lib/mixins/mutable-data_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/templatize_bridge.js';
+import 'polymer-bridges/polymer/lib/legacy/templatizer-behavior_bridge.js';
+import 'polymer-bridges/polymer/lib/elements/dom-bind_bridge.js';
+import 'polymer-bridges/polymer/lib/utils/html-tag_bridge.js';
+import 'polymer-bridges/polymer/polymer-element_bridge.js';
+import 'polymer-bridges/polymer/lib/elements/dom-repeat_bridge.js';
+import 'polymer-bridges/polymer/lib/elements/dom-if_bridge.js';
+import 'polymer-bridges/polymer/lib/elements/array-selector_bridge.js';
+import 'polymer-bridges/polymer/lib/elements/custom-style_bridge.js';
+import 'polymer-bridges/polymer/lib/legacy/mutable-data-behavior_bridge.js';
+import 'polymer-bridges/polymer/polymer-legacy_bridge.js';
+
+import '@polymer/iron-test-helpers/iron-test-helpers.js';
diff --git a/test/index.html b/test/index.html
index 24e1c10..7f5487d 100644
--- a/test/index.html
+++ b/test/index.html
@@ -19,8 +19,8 @@
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
 <title>Test Runner</title>
 <meta charset="utf-8">
-<script src="../node_modules/webcomponents.js/webcomponents-lite.min.js"></script>
-<script src="../node_modules/web-component-tester/browser.js"></script>
+<script src="../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <script>
   const suites = [