--- a/.eslintignore
+++ b/.eslintignore
@@ -348,16 +348,17 @@ toolkit/components/workerloader/tests/mo
 # Tests old non-star function generators
 toolkit/modules/tests/xpcshell/test_task.js
 
 # External code:
 toolkit/components/microformats/test/**
 toolkit/components/microformats/microformat-shiv.js
 toolkit/components/reader/Readability.js
 toolkit/components/reader/JSDOMParser.js
+toolkit/components/payments/res/vendor/*
 
 # Uses preprocessing
 toolkit/content/widgets/wizard.xml
 toolkit/components/osfile/osfile.jsm
 toolkit/components/urlformatter/nsURLFormatter.js
 toolkit/modules/AppConstants.jsm
 toolkit/mozapps/downloads/nsHelperAppDlg.js
 toolkit/mozapps/update/tests/data/xpcshellConstantsPP.js

--- a/toolkit/components/payments/jar.mn
+++ b/toolkit/components/payments/jar.mn
@@ -7,8 +7,11 @@ toolkit.jar:
     content/payments/paymentDialog.css                (content/paymentDialog.css)
     content/payments/paymentDialog.js                 (content/paymentDialog.js)
     content/payments/paymentDialogFrameScript.js      (content/paymentDialogFrameScript.js)
     content/payments/paymentDialog.xhtml              (content/paymentDialog.xhtml)
 %   resource payments %res/payments/
     res/payments                                      (res/paymentRequest.*)
     res/payments/debugging.html                       (res/debugging.html)
     res/payments/debugging.js                         (res/debugging.js)
+    res/payments/components/                          (res/components/*.js)
+    res/payments/mixins/                              (res/mixins/*.js)
+    res/payments/vendor/                              (res/vendor/*)

--- a/toolkit/components/payments/moz.build
+++ b/toolkit/components/payments/moz.build
@@ -11,13 +11,15 @@ with Files('**'):
 
 EXTRA_COMPONENTS += [
     'payments.manifest',
     'paymentUIService.js',
 ]
 
 JAR_MANIFESTS += ['jar.mn']
 
+MOCHITEST_MANIFESTS += ['test/mochitest/mochitest.ini']
+
 SPHINX_TREES['docs'] = 'docs'
 
 TESTING_JS_MODULES += [
     'test/PaymentTestUtils.jsm',
 ]

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/res/components/currency-amount.js
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * <currency-amount value="7.5" currency="USD"></currency-amount>
+ */
+
+/* global ObservedPropertiesMixin */
+
+class CurrencyAmount extends ObservedPropertiesMixin(HTMLElement) {
+  static get observedAttributes() {
+    return ["currency", "value"];
+  }
+
+  render() {
+    let output = "";
+    try {
+      if (this.value && this.currency) {
+        let number = Number.parseFloat(this.value);
+        if (Number.isNaN(number) || !Number.isFinite(number)) {
+          throw new RangeError("currency-amount value must be a finite number");
+        }
+        const formatter = new Intl.NumberFormat(navigator.languages, {
+          style: "currency",
+          currency: this.currency,
+          currencyDisplay: "symbol",
+        });
+        output = formatter.format(this.value);
+      }
+    } finally {
+      this.textContent = output;
+    }
+  }
+}
+
+customElements.define("currency-amount", CurrencyAmount);

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/res/mixins/ObservedPropertiesMixin.js
@@ -0,0 +1,66 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Define getters and setters for observedAttributes converted to camelCase and
+ * trigger a batched aynchronous call to `render` upon observed
+ * attribute/property changes.
+ */
+
+/* exported ObservedPropertiesMixin */
+
+function ObservedPropertiesMixin(superClass) {
+  return class ObservedProperties extends superClass {
+    constructor() {
+      super();
+
+      this._observedPropertiesMixin = {
+        pendingRender: false,
+      };
+
+      // Reflect property changes for `observedAttributes` to attributes.
+      for (let name of (this.constructor.observedAttributes || [])) {
+        if (name in this) {
+          // Don't overwrite existing properties.
+          continue;
+        }
+        // Convert attribute names from kebab-case to camelCase properties
+        Object.defineProperty(this, name.replace(/-([a-z])/g, ($0, $1) => $1.toUpperCase()), {
+          configurable: true,
+          get() {
+            return this.getAttribute(name);
+          },
+          set(value) {
+            if (value === null || value === undefined) {
+              this.removeAttribute(name);
+            } else {
+              this.setAttribute(name, value);
+            }
+          },
+        });
+      }
+    }
+
+    async _invalidateFromObservedPropertiesMixin() {
+      if (this._observedPropertiesMixin.pendingRender) {
+        return;
+      }
+
+      this._observedPropertiesMixin.pendingRender = true;
+      await Promise.resolve();
+      try {
+        this.render();
+      } finally {
+        this._observedPropertiesMixin.pendingRender = false;
+      }
+    }
+
+    attributeChangedCallback(attr, oldValue, newValue) {
+      if (oldValue === newValue) {
+        return;
+      }
+      this._invalidateFromObservedPropertiesMixin();
+    }
+  };
+}

--- a/toolkit/components/payments/res/paymentRequest.js
+++ b/toolkit/components/payments/res/paymentRequest.js
@@ -99,18 +99,19 @@ let PaymentRequest = {
     // Handle getting called before the DOM is ready.
     await this.domReadyPromise;
 
     let hostNameEl = document.getElementById("host-name");
     hostNameEl.textContent = this.request.topLevelPrincipal.URI.displayHost;
 
     let totalItem = this.request.paymentDetails.totalItem;
     let totalEl = document.getElementById("total");
-    totalEl.querySelector(".value").textContent = totalItem.amount.value;
-    totalEl.querySelector(".currency").textContent = totalItem.amount.currency;
+    let currencyEl = totalEl.querySelector("currency-amount");
+    currencyEl.value = totalItem.amount.value;
+    currencyEl.currency = totalItem.amount.currency;
     totalEl.querySelector(".label").textContent = totalItem.label;
   },
 
   onCancel() {
     this.sendMessageToChrome("paymentCancel");
   },
 
   onPaymentRequestUnload() {

--- a/toolkit/components/payments/res/paymentRequest.xhtml
+++ b/toolkit/components/payments/res/paymentRequest.xhtml
@@ -3,24 +3,26 @@
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 <!DOCTYPE html>
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
   <meta http-equiv="Content-Security-Policy" content="default-src 'self'"/>
   <title></title>
   <link rel="stylesheet" href="paymentRequest.css"/>
+  <script src="vendor/custom-elements.min.js"></script>
+  <script src="mixins/ObservedPropertiesMixin.js"></script>
+  <script src="components/currency-amount.js"></script>
   <script src="paymentRequest.js"></script>
 </head>
 <body>
   <iframe id="debugging-console" hidden="hidden" src="debugging.html"></iframe>
   <div id="host-name"></div>
 
   <div id="total">
     <h2 class="label"></h2>
-    <span class="value"></span>
-    <span class="currency"></span>
+    <currency-amount></currency-amount>
   </div>
   <div id="controls-container">
     <button id="cancel">Cancel payment</button>
   </div>
 </body>
 </html>

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/res/vendor/custom-elements.min.js
@@ -0,0 +1,37 @@
+(function(){
+'use strict';var h=new function(){};var aa=new Set("annotation-xml color-profile font-face font-face-src font-face-uri font-face-format font-face-name missing-glyph".split(" "));function n(b){var a=aa.has(b);b=/^[a-z][.0-9_a-z]*-[\-.0-9_a-z]*$/.test(b);return!a&&b}function p(b){var a=b.isConnected;if(void 0!==a)return a;for(;b&&!(b.__CE_isImportDocument||b instanceof Document);)b=b.parentNode||(window.ShadowRoot&&b instanceof ShadowRoot?b.host:void 0);return!(!b||!(b.__CE_isImportDocument||b instanceof Document))}
+function q(b,a){for(;a&&a!==b&&!a.nextSibling;)a=a.parentNode;return a&&a!==b?a.nextSibling:null}
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+ Copyright (c) 2016 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
+*/
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+
+//# sourceMappingURL=custom-elements.min.js.map

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/res/vendor/custom-elements.min.js.map
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* This class exists only to work around Closure's lack of a way to describe\n * singletons. It represents the 'already constructed marker' used in custom\n * element construction stacks.\n *\n * https://html.spec.whatwg.org/#concept-already-constructed-marker\n */\nclass AlreadyConstructedMarker {}\n\nexport default new AlreadyConstructedMarker();\n","const reservedTagList = new Set([\n  'annotation-xml',\n  'color-profile',\n  'font-face',\n  'font-face-src',\n  'font-face-uri',\n  'font-face-format',\n  'font-face-name',\n  'missing-glyph',\n]);\n\n/**\n * @param {string} localName\n * @returns {boolean}\n */\nexport function isValidCustomElementName(localName) {\n  const reserved = reservedTagList.has(localName);\n  const validForm = /^[a-z][.0-9_a-z]*-[\\-.0-9_a-z]*$/.test(localName);\n  return !reserved && validForm;\n}\n\n/**\n * @private\n * @param {!Node} node\n * @return {boolean}\n */\nexport function isConnected(node) {\n  // Use `Node#isConnected`, if defined.\n  const nativeValue = node.isConnected;\n  if (nativeValue !== undefined) {\n    return nativeValue;\n  }\n\n  /** @type {?Node|undefined} */\n  let current = node;\n  while (current && !(current.__CE_isImportDocument || current instanceof Document)) {\n    current = current.parentNode || (window.ShadowRoot && current instanceof ShadowRoot ? current.host : undefined);\n  }\n  return !!(current && (current.__CE_isImportDocument || current instanceof Document));\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextSiblingOrAncestorSibling(root, start) {\n  let node = start;\n  while (node && node !== root && !node.nextSibling) {\n    node = node.parentNode;\n  }\n  return (!node || node === root) ? null : node.nextSibling;\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextNode(root, start) {\n  return start.firstChild ? start.firstChild : nextSiblingOrAncestorSibling(root, start);\n}\n\n/**\n * @param {!Node} root\n * @param {!function(!Element)} callback\n * @param {!Set<Node>=} visitedImports\n */\nexport function walkDeepDescendantElements(root, callback, visitedImports = new Set()) {\n  let node = root;\n  while (node) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      const element = /** @type {!Element} */(node);\n\n      callback(element);\n\n      const localName = element.localName;\n      if (localName === 'link' && element.getAttribute('rel') === 'import') {\n        // If this import (polyfilled or not) has it's root node available,\n        // walk it.\n        const importNode = /** @type {!Node} */ (element.import);\n        if (importNode instanceof Node && !visitedImports.has(importNode)) {\n          // Prevent multiple walks of the same import root.\n          visitedImports.add(importNode);\n\n          for (let child = importNode.firstChild; child; child = child.nextSibling) {\n            walkDeepDescendantElements(child, callback, visitedImports);\n          }\n        }\n\n        // Ignore descendants of import links to prevent attempting to walk the\n        // elements created by the HTML Imports polyfill that we just walked\n        // above.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      } else if (localName === 'template') {\n        // Ignore descendants of templates. There shouldn't be any descendants\n        // because they will be moved into `.content` during construction in\n        // browsers that support template but, in case they exist and are still\n        // waiting to be moved by a polyfill, they will be ignored.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      }\n\n      // Walk shadow roots.\n      const shadowRoot = element.__CE_shadowRoot;\n      if (shadowRoot) {\n        for (let child = shadowRoot.firstChild; child; child = child.nextSibling) {\n          walkDeepDescendantElements(child, callback, visitedImports);\n        }\n      }\n    }\n\n    node = nextNode(root, node);\n  }\n}\n\n/**\n * Used to suppress Closure's \"Modifying the prototype is only allowed if the\n * constructor is in the same scope\" warning without using\n * `@suppress {newCheckTypes, duplicate}` because `newCheckTypes` is too broad.\n *\n * @param {!Object} destination\n * @param {string} name\n * @param {*} value\n */\nexport function setPropertyUnchecked(destination, name, value) {\n  destination[name] = value;\n}\n","import * as Utilities from './Utilities.js';\nimport CEState from './CustomElementState.js';\n\nexport default class CustomElementInternals {\n  constructor() {\n    /** @type {!Map<string, !CustomElementDefinition>} */\n    this._localNameToDefinition = new Map();\n\n    /** @type {!Map<!Function, !CustomElementDefinition>} */\n    this._constructorToDefinition = new Map();\n\n    /** @type {!Array<!function(!Node)>} */\n    this._patches = [];\n\n    /** @type {boolean} */\n    this._hasPatches = false;\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!CustomElementDefinition} definition\n   */\n  setDefinition(localName, definition) {\n    this._localNameToDefinition.set(localName, definition);\n    this._constructorToDefinition.set(definition.constructor, definition);\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!CustomElementDefinition|undefined}\n   */\n  localNameToDefinition(localName) {\n    return this._localNameToDefinition.get(localName);\n  }\n\n  /**\n   * @param {!Function} constructor\n   * @return {!CustomElementDefinition|undefined}\n   */\n  constructorToDefinition(constructor) {\n    return this._constructorToDefinition.get(constructor);\n  }\n\n  /**\n   * @param {!function(!Node)} listener\n   */\n  addPatch(listener) {\n    this._hasPatches = true;\n    this._patches.push(listener);\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patchTree(node) {\n    if (!this._hasPatches) return;\n\n    Utilities.walkDeepDescendantElements(node, element => this.patch(element));\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patch(node) {\n    if (!this._hasPatches) return;\n\n    if (node.__CE_patched) return;\n    node.__CE_patched = true;\n\n    for (let i = 0; i < this._patches.length; i++) {\n      this._patches[i](node);\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  connectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.connectedCallback(element);\n      } else {\n        this.upgradeElement(element);\n      }\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  disconnectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.disconnectedCallback(element);\n      }\n    }\n  }\n\n  /**\n   * Upgrades all uncustomized custom elements at and below a root node for\n   * which there is a definition. When custom element reaction callbacks are\n   * assumed to be called synchronously (which, by the current DOM / HTML spec\n   * definitions, they are *not*), callbacks for both elements customized\n   * synchronously by the parser and elements being upgraded occur in the same\n   * relative order.\n   *\n   * NOTE: This function, when used to simulate the construction of a tree that\n   * is already created but not customized (i.e. by the parser), does *not*\n   * prevent the element from reading the 'final' (true) state of the tree. For\n   * example, the element, during truly synchronous parsing / construction would\n   * see that it contains no children as they have not yet been inserted.\n   * However, this function does not modify the tree, the element will\n   * (incorrectly) have children. Additionally, self-modification restrictions\n   * for custom element constructors imposed by the DOM spec are *not* enforced.\n   *\n   *\n   * The following nested list shows the steps extending down from the HTML\n   * spec's parsing section that cause elements to be synchronously created and\n   * upgraded:\n   *\n   * The \"in body\" insertion mode:\n   * https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody\n   * - Switch on token:\n   *   .. other cases ..\n   *   -> Any other start tag\n   *      - [Insert an HTML element](below) for the token.\n   *\n   * Insert an HTML element:\n   * https://html.spec.whatwg.org/multipage/syntax.html#insert-an-html-element\n   * - Insert a foreign element for the token in the HTML namespace:\n   *   https://html.spec.whatwg.org/multipage/syntax.html#insert-a-foreign-element\n   *   - Create an element for a token:\n   *     https://html.spec.whatwg.org/multipage/syntax.html#create-an-element-for-the-token\n   *     - Will execute script flag is true?\n   *       - (Element queue pushed to the custom element reactions stack.)\n   *     - Create an element:\n   *       https://dom.spec.whatwg.org/#concept-create-element\n   *       - Sync CE flag is true?\n   *         - Constructor called.\n   *         - Self-modification restrictions enforced.\n   *       - Sync CE flag is false?\n   *         - (Upgrade reaction enqueued.)\n   *     - Attributes appended to element.\n   *       (`attributeChangedCallback` reactions enqueued.)\n   *     - Will execute script flag is true?\n   *       - (Element queue popped from the custom element reactions stack.\n   *         Reactions in the popped stack are invoked.)\n   *   - (Element queue pushed to the custom element reactions stack.)\n   *   - Insert the element:\n   *     https://dom.spec.whatwg.org/#concept-node-insert\n   *     - Shadow-including descendants are connected. During parsing\n   *       construction, there are no shadow-*excluding* descendants.\n   *       However, the constructor may have validly attached a shadow\n   *       tree to itself and added descendants to that shadow tree.\n   *       (`connectedCallback` reactions enqueued.)\n   *   - (Element queue popped from the custom element reactions stack.\n   *     Reactions in the popped stack are invoked.)\n   *\n   * @param {!Node} root\n   * @param {{\n   *   visitedImports: (!Set<!Node>|undefined),\n   *   upgrade: (!function(!Element)|undefined),\n   * }=} options\n   */\n  patchAndUpgradeTree(root, options = {}) {\n    const visitedImports = options.visitedImports || new Set();\n    const upgrade = options.upgrade || (element => this.upgradeElement(element));\n\n    const elements = [];\n\n    const gatherElements = element => {\n      if (element.localName === 'link' && element.getAttribute('rel') === 'import') {\n        // The HTML Imports polyfill sets a descendant element of the link to\n        // the `import` property, specifically this is *not* a Document.\n        const importNode = /** @type {?Node} */ (element.import);\n\n        if (importNode instanceof Node && importNode.readyState === 'complete') {\n          importNode.__CE_isImportDocument = true;\n\n          // Connected links are associated with the registry.\n          importNode.__CE_hasRegistry = true;\n        } else {\n          // If this link's import root is not available, its contents can't be\n          // walked. Wait for 'load' and walk it when it's ready.\n          element.addEventListener('load', () => {\n            const importNode = /** @type {!Node} */ (element.import);\n\n            if (importNode.__CE_documentLoadHandled) return;\n            importNode.__CE_documentLoadHandled = true;\n\n            importNode.__CE_isImportDocument = true;\n\n            // Connected links are associated with the registry.\n            importNode.__CE_hasRegistry = true;\n\n            // Clone the `visitedImports` set that was populated sync during\n            // the `patchAndUpgradeTree` call that caused this 'load' handler to\n            // be added. Then, remove *this* link's import node so that we can\n            // walk that import again, even if it was partially walked later\n            // during the same `patchAndUpgradeTree` call.\n            const clonedVisitedImports = new Set(visitedImports);\n            clonedVisitedImports.delete(importNode);\n\n            this.patchAndUpgradeTree(importNode, {visitedImports: clonedVisitedImports, upgrade});\n          });\n        }\n      } else {\n        elements.push(element);\n      }\n    };\n\n    // `walkDeepDescendantElements` populates (and internally checks against)\n    // `visitedImports` when traversing a loaded import.\n    Utilities.walkDeepDescendantElements(root, gatherElements, visitedImports);\n\n    if (this._hasPatches) {\n      for (let i = 0; i < elements.length; i++) {\n        this.patch(elements[i]);\n      }\n    }\n\n    for (let i = 0; i < elements.length; i++) {\n      upgrade(elements[i]);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  upgradeElement(element) {\n    const currentState = element.__CE_state;\n    if (currentState !== undefined) return;\n\n    const definition = this.localNameToDefinition(element.localName);\n    if (!definition) return;\n\n    definition.constructionStack.push(element);\n\n    const constructor = definition.constructor;\n    try {\n      try {\n        let result = new (constructor)();\n        if (result !== element) {\n          throw new Error('The custom element constructor did not produce the element being upgraded.');\n        }\n      } finally {\n        definition.constructionStack.pop();\n      }\n    } catch (e) {\n      element.__CE_state = CEState.failed;\n      throw e;\n    }\n\n    element.__CE_state = CEState.custom;\n    element.__CE_definition = definition;\n\n    if (definition.attributeChangedCallback) {\n      const observedAttributes = definition.observedAttributes;\n      for (let i = 0; i < observedAttributes.length; i++) {\n        const name = observedAttributes[i];\n        const value = element.getAttribute(name);\n        if (value !== null) {\n          this.attributeChangedCallback(element, name, null, value, null);\n        }\n      }\n    }\n\n    if (Utilities.isConnected(element)) {\n      this.connectedCallback(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  connectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.connectedCallback) {\n      definition.connectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  disconnectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.disconnectedCallback) {\n      definition.disconnectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   * @param {string} name\n   * @param {?string} oldValue\n   * @param {?string} newValue\n   * @param {?string} namespace\n   */\n  attributeChangedCallback(element, name, oldValue, newValue, namespace) {\n    const definition = element.__CE_definition;\n    if (\n      definition.attributeChangedCallback &&\n      definition.observedAttributes.indexOf(name) > -1\n    ) {\n      definition.attributeChangedCallback.call(element, name, oldValue, newValue, namespace);\n    }\n  }\n}\n","/**\n * @enum {number}\n */\nconst CustomElementState = {\n  custom: 1,\n  failed: 2,\n};\n\nexport default CustomElementState;\n","import CustomElementInternals from './CustomElementInternals.js';\n\nexport default class DocumentConstructionObserver {\n  constructor(internals, doc) {\n    /**\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @type {!Document}\n     */\n    this._document = doc;\n\n    /**\n     * @type {MutationObserver|undefined}\n     */\n    this._observer = undefined;\n\n\n    // Simulate tree construction for all currently accessible nodes in the\n    // document.\n    this._internals.patchAndUpgradeTree(this._document);\n\n    if (this._document.readyState === 'loading') {\n      this._observer = new MutationObserver(this._handleMutations.bind(this));\n\n      // Nodes created by the parser are given to the observer *before* the next\n      // task runs. Inline scripts are run in a new task. This means that the\n      // observer will be able to handle the newly parsed nodes before the inline\n      // script is run.\n      this._observer.observe(this._document, {\n        childList: true,\n        subtree: true,\n      });\n    }\n  }\n\n  disconnect() {\n    if (this._observer) {\n      this._observer.disconnect();\n    }\n  }\n\n  /**\n   * @param {!Array<!MutationRecord>} mutations\n   */\n  _handleMutations(mutations) {\n    // Once the document's `readyState` is 'interactive' or 'complete', all new\n    // nodes created within that document will be the result of script and\n    // should be handled by patching.\n    const readyState = this._document.readyState;\n    if (readyState === 'interactive' || readyState === 'complete') {\n      this.disconnect();\n    }\n\n    for (let i = 0; i < mutations.length; i++) {\n      const addedNodes = mutations[i].addedNodes;\n      for (let j = 0; j < addedNodes.length; j++) {\n        const node = addedNodes[j];\n        this._internals.patchAndUpgradeTree(node);\n      }\n    }\n  }\n}\n","/**\n * @template T\n */\nexport default class Deferred {\n  constructor() {\n    /**\n     * @private\n     * @type {T|undefined}\n     */\n    this._value = undefined;\n\n    /**\n     * @private\n     * @type {Function|undefined}\n     */\n    this._resolve = undefined;\n\n    /**\n     * @private\n     * @type {!Promise<T>}\n     */\n    this._promise = new Promise(resolve => {\n      this._resolve = resolve;\n\n      if (this._value) {\n        resolve(this._value);\n      }\n    });\n  }\n\n  /**\n   * @param {T} value\n   */\n  resolve(value) {\n    if (this._value) {\n      throw new Error('Already resolved.');\n    }\n\n    this._value = value;\n\n    if (this._resolve) {\n      this._resolve(value);\n    }\n  }\n\n  /**\n   * @return {!Promise<T>}\n   */\n  toPromise() {\n    return this._promise;\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\nimport DocumentConstructionObserver from './DocumentConstructionObserver.js';\nimport Deferred from './Deferred.js';\nimport * as Utilities from './Utilities.js';\n\n/**\n * @unrestricted\n */\nexport default class CustomElementRegistry {\n\n  /**\n   * @param {!CustomElementInternals} internals\n   */\n  constructor(internals) {\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._elementDefinitionIsRunning = false;\n\n    /**\n     * @private\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @private\n     * @type {!Map<string, !Deferred<undefined>>}\n     */\n    this._whenDefinedDeferred = new Map();\n\n    /**\n     * The default flush callback triggers the document walk synchronously.\n     * @private\n     * @type {!Function}\n     */\n    this._flushCallback = fn => fn();\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._flushPending = false;\n\n    /**\n     * @private\n     * @type {!Array<!CustomElementDefinition>}\n     */\n    this._pendingDefinitions = [];\n\n    /**\n     * @private\n     * @type {!DocumentConstructionObserver}\n     */\n    this._documentConstructionObserver = new DocumentConstructionObserver(internals, document);\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!Function} constructor\n   */\n  define(localName, constructor) {\n    if (!(constructor instanceof Function)) {\n      throw new TypeError('Custom element constructors must be functions.');\n    }\n\n    if (!Utilities.isValidCustomElementName(localName)) {\n      throw new SyntaxError(`The element name '${localName}' is not valid.`);\n    }\n\n    if (this._internals.localNameToDefinition(localName)) {\n      throw new Error(`A custom element with name '${localName}' has already been defined.`);\n    }\n\n    if (this._elementDefinitionIsRunning) {\n      throw new Error('A custom element is already being defined.');\n    }\n    this._elementDefinitionIsRunning = true;\n\n    let connectedCallback;\n    let disconnectedCallback;\n    let adoptedCallback;\n    let attributeChangedCallback;\n    let observedAttributes;\n    try {\n      /** @type {!Object} */\n      const prototype = constructor.prototype;\n      if (!(prototype instanceof Object)) {\n        throw new TypeError('The custom element constructor\\'s prototype is not an object.');\n      }\n\n      function getCallback(name) {\n        const callbackValue = prototype[name];\n        if (callbackValue !== undefined && !(callbackValue instanceof Function)) {\n          throw new Error(`The '${name}' callback must be a function.`);\n        }\n        return callbackValue;\n      }\n\n      connectedCallback = getCallback('connectedCallback');\n      disconnectedCallback = getCallback('disconnectedCallback');\n      adoptedCallback = getCallback('adoptedCallback');\n      attributeChangedCallback = getCallback('attributeChangedCallback');\n      observedAttributes = constructor['observedAttributes'] || [];\n    } catch (e) {\n      return;\n    } finally {\n      this._elementDefinitionIsRunning = false;\n    }\n\n    const definition = {\n      localName,\n      constructor,\n      connectedCallback,\n      disconnectedCallback,\n      adoptedCallback,\n      attributeChangedCallback,\n      observedAttributes,\n      constructionStack: [],\n    };\n\n    this._internals.setDefinition(localName, definition);\n    this._pendingDefinitions.push(definition);\n\n    // If we've already called the flush callback and it hasn't called back yet,\n    // don't call it again.\n    if (!this._flushPending) {\n      this._flushPending = true;\n      this._flushCallback(() => this._flush());\n    }\n  }\n\n  _flush() {\n    // If no new definitions were defined, don't attempt to flush. This could\n    // happen if a flush callback keeps the function it is given and calls it\n    // multiple times.\n    if (this._flushPending === false) return;\n    this._flushPending = false;\n\n    const pendingDefinitions = this._pendingDefinitions;\n\n    /**\n     * Unupgraded elements with definitions that were defined *before* the last\n     * flush, in document order.\n     * @type {!Array<!Element>}\n     */\n    const elementsWithStableDefinitions = [];\n\n    /**\n     * A map from `localName`s of definitions that were defined *after* the last\n     * flush to unupgraded elements matching that definition, in document order.\n     * @type {!Map<string, !Array<!Element>>}\n     */\n    const elementsWithPendingDefinitions = new Map();\n    for (let i = 0; i < pendingDefinitions.length; i++) {\n      elementsWithPendingDefinitions.set(pendingDefinitions[i].localName, []);\n    }\n\n    this._internals.patchAndUpgradeTree(document, {\n      upgrade: element => {\n        // Ignore the element if it has already upgraded or failed to upgrade.\n        if (element.__CE_state !== undefined) return;\n\n        const localName = element.localName;\n\n        // If there is an applicable pending definition for the element, add the\n        // element to the list of elements to be upgraded with that definition.\n        const pendingElements = elementsWithPendingDefinitions.get(localName);\n        if (pendingElements) {\n          pendingElements.push(element);\n        // If there is *any other* applicable definition for the element, add it\n        // to the list of elements with stable definitions that need to be upgraded.\n        } else if (this._internals.localNameToDefinition(localName)) {\n          elementsWithStableDefinitions.push(element);\n        }\n      },\n    });\n\n    // Upgrade elements with 'stable' definitions first.\n    for (let i = 0; i < elementsWithStableDefinitions.length; i++) {\n      this._internals.upgradeElement(elementsWithStableDefinitions[i]);\n    }\n\n    // Upgrade elements with 'pending' definitions in the order they were defined.\n    while (pendingDefinitions.length > 0) {\n      const definition = pendingDefinitions.shift();\n      const localName = definition.localName;\n\n      // Attempt to upgrade all applicable elements.\n      const pendingUpgradableElements = elementsWithPendingDefinitions.get(definition.localName);\n      for (let i = 0; i < pendingUpgradableElements.length; i++) {\n        this._internals.upgradeElement(pendingUpgradableElements[i]);\n      }\n\n      // Resolve any promises created by `whenDefined` for the definition.\n      const deferred = this._whenDefinedDeferred.get(localName);\n      if (deferred) {\n        deferred.resolve(undefined);\n      }\n    }\n  }\n\n  /**\n   * @param {string} localName\n   * @return {Function|undefined}\n   */\n  get(localName) {\n    const definition = this._internals.localNameToDefinition(localName);\n    if (definition) {\n      return definition.constructor;\n    }\n\n    return undefined;\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!Promise<undefined>}\n   */\n  whenDefined(localName) {\n    if (!Utilities.isValidCustomElementName(localName)) {\n      return Promise.reject(new SyntaxError(`'${localName}' is not a valid custom element name.`));\n    }\n\n    const prior = this._whenDefinedDeferred.get(localName);\n    if (prior) {\n      return prior.toPromise();\n    }\n\n    const deferred = new Deferred();\n    this._whenDefinedDeferred.set(localName, deferred);\n\n    const definition = this._internals.localNameToDefinition(localName);\n    // Resolve immediately only if the given local name has a definition *and*\n    // the full document walk to upgrade elements with that local name has\n    // already happened.\n    if (definition && !this._pendingDefinitions.some(d => d.localName === localName)) {\n      deferred.resolve(undefined);\n    }\n\n    return deferred.toPromise();\n  }\n\n  polyfillWrapFlushCallback(outer) {\n    this._documentConstructionObserver.disconnect();\n    const inner = this._flushCallback;\n    this._flushCallback = flush => outer(() => inner(flush));\n  }\n}\n\n// Closure compiler exports.\nwindow['CustomElementRegistry'] = CustomElementRegistry;\nCustomElementRegistry.prototype['define'] = CustomElementRegistry.prototype.define;\nCustomElementRegistry.prototype['get'] = CustomElementRegistry.prototype.get;\nCustomElementRegistry.prototype['whenDefined'] = CustomElementRegistry.prototype.whenDefined;\nCustomElementRegistry.prototype['polyfillWrapFlushCallback'] = CustomElementRegistry.prototype.polyfillWrapFlushCallback;\n","export default {\n  Document_createElement: window.Document.prototype.createElement,\n  Document_createElementNS: window.Document.prototype.createElementNS,\n  Document_importNode: window.Document.prototype.importNode,\n  Document_prepend: window.Document.prototype['prepend'],\n  Document_append: window.Document.prototype['append'],\n  DocumentFragment_prepend: window.DocumentFragment.prototype['prepend'],\n  DocumentFragment_append: window.DocumentFragment.prototype['append'],\n  Node_cloneNode: window.Node.prototype.cloneNode,\n  Node_appendChild: window.Node.prototype.appendChild,\n  Node_insertBefore: window.Node.prototype.insertBefore,\n  Node_removeChild: window.Node.prototype.removeChild,\n  Node_replaceChild: window.Node.prototype.replaceChild,\n  Node_textContent: Object.getOwnPropertyDescriptor(window.Node.prototype, 'textContent'),\n  Element_attachShadow: window.Element.prototype['attachShadow'],\n  Element_innerHTML: Object.getOwnPropertyDescriptor(window.Element.prototype, 'innerHTML'),\n  Element_getAttribute: window.Element.prototype.getAttribute,\n  Element_setAttribute: window.Element.prototype.setAttribute,\n  Element_removeAttribute: window.Element.prototype.removeAttribute,\n  Element_getAttributeNS: window.Element.prototype.getAttributeNS,\n  Element_setAttributeNS: window.Element.prototype.setAttributeNS,\n  Element_removeAttributeNS: window.Element.prototype.removeAttributeNS,\n  Element_insertAdjacentElement: window.Element.prototype['insertAdjacentElement'],\n  Element_prepend: window.Element.prototype['prepend'],\n  Element_append: window.Element.prototype['append'],\n  Element_before: window.Element.prototype['before'],\n  Element_after: window.Element.prototype['after'],\n  Element_replaceWith: window.Element.prototype['replaceWith'],\n  Element_remove: window.Element.prototype['remove'],\n  HTMLElement: window.HTMLElement,\n  HTMLElement_innerHTML: Object.getOwnPropertyDescriptor(window.HTMLElement.prototype, 'innerHTML'),\n  HTMLElement_insertAdjacentElement: window.HTMLElement.prototype['insertAdjacentElement'],\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport AlreadyConstructedMarker from '../AlreadyConstructedMarker.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  window['HTMLElement'] = (function() {\n    /**\n     * @type {function(new: HTMLElement): !HTMLElement}\n     */\n    function HTMLElement() {\n      // This should really be `new.target` but `new.target` can't be emulated\n      // in ES5. Assuming the user keeps the default value of the constructor's\n      // prototype's `constructor` property, this is equivalent.\n      /** @type {!Function} */\n      const constructor = this.constructor;\n\n      const definition = internals.constructorToDefinition(constructor);\n      if (!definition) {\n        throw new Error('The custom element being constructed was not registered with `customElements`.');\n      }\n\n      const constructionStack = definition.constructionStack;\n\n      if (constructionStack.length === 0) {\n        const element = Native.Document_createElement.call(document, definition.localName);\n        Object.setPrototypeOf(element, constructor.prototype);\n        element.__CE_state = CEState.custom;\n        element.__CE_definition = definition;\n        internals.patch(element);\n        return element;\n      }\n\n      const lastIndex = constructionStack.length - 1;\n      const element = constructionStack[lastIndex];\n      if (element === AlreadyConstructedMarker) {\n        throw new Error('The HTMLElement constructor was either called reentrantly for this constructor or called multiple times.');\n      }\n      constructionStack[lastIndex] = AlreadyConstructedMarker;\n\n      Object.setPrototypeOf(element, constructor.prototype);\n      internals.patch(/** @type {!HTMLElement} */ (element));\n\n      return element;\n    }\n\n    HTMLElement.prototype = Native.HTMLElement.prototype;\n\n    return HTMLElement;\n  })();\n};\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\nimport CustomElementInternals from './CustomElementInternals.js';\nimport CustomElementRegistry from './CustomElementRegistry.js';\n\nimport PatchHTMLElement from './Patch/HTMLElement.js';\nimport PatchDocument from './Patch/Document.js';\nimport PatchDocumentFragment from './Patch/DocumentFragment.js';\nimport PatchNode from './Patch/Node.js';\nimport PatchElement from './Patch/Element.js';\n\nconst priorCustomElements = window['customElements'];\n\nif (!priorCustomElements ||\n     priorCustomElements['forcePolyfill'] ||\n     (typeof priorCustomElements['define'] != 'function') ||\n     (typeof priorCustomElements['get'] != 'function')) {\n  /** @type {!CustomElementInternals} */\n  const internals = new CustomElementInternals();\n\n  PatchHTMLElement(internals);\n  PatchDocument(internals);\n  PatchDocumentFragment(internals);\n  PatchNode(internals);\n  PatchElement(internals);\n\n  // The main document is always associated with the registry.\n  document.__CE_hasRegistry = true;\n\n  /** @type {!CustomElementRegistry} */\n  const customElements = new CustomElementRegistry(internals);\n\n  Object.defineProperty(window, 'customElements', {\n    configurable: true,\n    enumerable: true,\n    value: customElements,\n  });\n}\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   prepend: !function(...(!Node|string)),\n  *  append: !function(...(!Node|string)),\n * }}\n */\nlet ParentNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ParentNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {!function(...(!Node|string))} builtInMethod\n   * @return {!function(...(!Node|string))}\n   */\n  function appendPrependPatch(builtInMethod) {\n    return function(...nodes) {\n      /**\n       * A copy of `nodes`, with any DocumentFragment replaced by its children.\n       * @type {!Array<!Node>}\n       */\n      const flattenedNodes = [];\n\n      /**\n       * Elements in `nodes` that were connected before this call.\n       * @type {!Array<!Node>}\n       */\n      const connectedElements = [];\n\n      for (var i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n\n        if (node instanceof Element && Utilities.isConnected(node)) {\n          connectedElements.push(node);\n        }\n\n        if (node instanceof DocumentFragment) {\n          for (let child = node.firstChild; child; child = child.nextSibling) {\n            flattenedNodes.push(child);\n          }\n        } else {\n          flattenedNodes.push(node);\n        }\n      }\n\n      builtInMethod.apply(this, nodes);\n\n      for (let i = 0; i < connectedElements.length; i++) {\n        internals.disconnectTree(connectedElements[i]);\n      }\n\n      if (Utilities.isConnected(this)) {\n        for (let i = 0; i < flattenedNodes.length; i++) {\n          const node = flattenedNodes[i];\n          if (node instanceof Element) {\n            internals.connectTree(node);\n          }\n        }\n      }\n    };\n  }\n\n  if (builtIn.prepend !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'prepend', appendPrependPatch(builtIn.prepend));\n  }\n\n  if (builtIn.append !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'append', appendPrependPatch(builtIn.append));\n  }\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElement',\n    /**\n     * @this {Document}\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElement.call(this, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'importNode',\n    /**\n     * @this {Document}\n     * @param {!Node} node\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(node, deep) {\n      const clone = Native.Document_importNode.call(this, node, deep);\n      // Only create custom elements if this document is associated with the registry.\n      if (!this.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  const NS_HTML = \"http://www.w3.org/1999/xhtml\";\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElementNS',\n    /**\n     * @this {Document}\n     * @param {?string} namespace\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(namespace, localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry && (namespace === null || namespace === NS_HTML)) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElementNS.call(this, namespace, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  PatchParentNode(internals, Document.prototype, {\n    prepend: Native.Document_prepend,\n    append: Native.Document_append,\n  });\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  // `Node#nodeValue` is implemented on `Attr`.\n  // `Node#textContent` is implemented on `Attr`, `Element`.\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'insertBefore',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @param {?Node} refNode\n     * @return {!Node}\n     */\n    function(node, refNode) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'appendChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_appendChild.call(this, node);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_appendChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'cloneNode',\n    /**\n     * @this {Node}\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(deep) {\n      const clone = Native.Node_cloneNode.call(this, deep);\n      // Only create custom elements if this element's owner document is\n      // associated with the registry.\n      if (!this.ownerDocument.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'removeChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_removeChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'replaceChild',\n    /**\n     * @this {Node}\n     * @param {!Node} nodeToInsert\n     * @param {!Node} nodeToRemove\n     * @return {!Node}\n     */\n    function(nodeToInsert, nodeToRemove) {\n      if (nodeToInsert instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(nodeToInsert.childNodes);\n        const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          internals.disconnectTree(nodeToRemove);\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeToInsertWasConnected = Utilities.isConnected(nodeToInsert);\n      const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n      const thisIsConnected = Utilities.isConnected(this);\n\n      if (thisIsConnected) {\n        internals.disconnectTree(nodeToRemove);\n      }\n\n      if (nodeToInsertWasConnected) {\n        internals.disconnectTree(nodeToInsert);\n      }\n\n      if (thisIsConnected) {\n        internals.connectTree(nodeToInsert);\n      }\n\n      return nativeResult;\n    });\n\n\n  function patch_textContent(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'textContent', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Node} */ function(assignedValue) {\n        // If this is a text node then there are no nodes to disconnect.\n        if (this.nodeType === Node.TEXT_NODE) {\n          baseDescriptor.set.call(this, assignedValue);\n          return;\n        }\n\n        let removedNodes = undefined;\n        // Checking for `firstChild` is faster than reading `childNodes.length`\n        // to compare with 0.\n        if (this.firstChild) {\n          // Using `childNodes` is faster than `children`, even though we only\n          // care about elements.\n          const childNodes = this.childNodes;\n          const childNodesLength = childNodes.length;\n          if (childNodesLength > 0 && Utilities.isConnected(this)) {\n            // Copying an array by iterating is faster than using slice.\n            removedNodes = new Array(childNodesLength);\n            for (let i = 0; i < childNodesLength; i++) {\n              removedNodes[i] = childNodes[i];\n            }\n          }\n        }\n\n        baseDescriptor.set.call(this, assignedValue);\n\n        if (removedNodes) {\n          for (let i = 0; i < removedNodes.length; i++) {\n            internals.disconnectTree(removedNodes[i]);\n          }\n        }\n      },\n    });\n  }\n\n  if (Native.Node_textContent && Native.Node_textContent.get) {\n    patch_textContent(Node.prototype, Native.Node_textContent);\n  } else {\n    internals.addPatch(function(element) {\n      patch_textContent(element, {\n        enumerable: true,\n        configurable: true,\n        // NOTE: This implementation of the `textContent` getter assumes that\n        // text nodes' `textContent` getter will not be patched.\n        get: /** @this {Node} */ function() {\n          /** @type {!Array<string>} */\n          const parts = [];\n\n          for (let i = 0; i < this.childNodes.length; i++) {\n            parts.push(this.childNodes[i].textContent);\n          }\n\n          return parts.join('');\n        },\n        set: /** @this {Node} */ function(assignedValue) {\n          while (this.firstChild) {\n            Native.Node_removeChild.call(this, this.firstChild);\n          }\n          Native.Node_appendChild.call(this, document.createTextNode(assignedValue));\n        },\n      });\n    });\n  }\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   before: !function(...(!Node|string)),\n *   after: !function(...(!Node|string)),\n *   replaceWith: !function(...(!Node|string)),\n *   remove: !function(),\n * }}\n */\nlet ChildNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ChildNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {!function(...(!Node|string))} builtInMethod\n   * @return {!function(...(!Node|string))}\n   */\n  function beforeAfterPatch(builtInMethod) {\n    return function(...nodes) {\n      /**\n       * A copy of `nodes`, with any DocumentFragment replaced by its children.\n       * @type {!Array<!Node>}\n       */\n      const flattenedNodes = [];\n\n      /**\n       * Elements in `nodes` that were connected before this call.\n       * @type {!Array<!Node>}\n       */\n      const connectedElements = [];\n\n      for (var i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n\n        if (node instanceof Element && Utilities.isConnected(node)) {\n          connectedElements.push(node);\n        }\n\n        if (node instanceof DocumentFragment) {\n          for (let child = node.firstChild; child; child = child.nextSibling) {\n            flattenedNodes.push(child);\n          }\n        } else {\n          flattenedNodes.push(node);\n        }\n      }\n\n      builtInMethod.apply(this, nodes);\n\n      for (let i = 0; i < connectedElements.length; i++) {\n        internals.disconnectTree(connectedElements[i]);\n      }\n\n      if (Utilities.isConnected(this)) {\n        for (let i = 0; i < flattenedNodes.length; i++) {\n          const node = flattenedNodes[i];\n          if (node instanceof Element) {\n            internals.connectTree(node);\n          }\n        }\n      }\n    };\n  }\n\n  if (builtIn.before !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'before', beforeAfterPatch(builtIn.before));\n  }\n\n  if (builtIn.before !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'after', beforeAfterPatch(builtIn.after));\n  }\n\n  if (builtIn.replaceWith !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'replaceWith',\n      /**\n       * @param {...(!Node|string)} nodes\n       */\n      function(...nodes) {\n        /**\n         * A copy of `nodes`, with any DocumentFragment replaced by its children.\n         * @type {!Array<!Node>}\n         */\n        const flattenedNodes = [];\n\n        /**\n         * Elements in `nodes` that were connected before this call.\n         * @type {!Array<!Node>}\n         */\n        const connectedElements = [];\n\n        for (var i = 0; i < nodes.length; i++) {\n          const node = nodes[i];\n\n          if (node instanceof Element && Utilities.isConnected(node)) {\n            connectedElements.push(node);\n          }\n\n          if (node instanceof DocumentFragment) {\n            for (let child = node.firstChild; child; child = child.nextSibling) {\n              flattenedNodes.push(child);\n            }\n          } else {\n            flattenedNodes.push(node);\n          }\n        }\n\n        const wasConnected = Utilities.isConnected(this);\n\n        builtIn.replaceWith.apply(this, nodes);\n\n        for (let i = 0; i < connectedElements.length; i++) {\n          internals.disconnectTree(connectedElements[i]);\n        }\n\n        if (wasConnected) {\n          internals.disconnectTree(this);\n          for (let i = 0; i < flattenedNodes.length; i++) {\n            const node = flattenedNodes[i];\n            if (node instanceof Element) {\n              internals.connectTree(node);\n            }\n          }\n        }\n      });\n    }\n\n  if (builtIn.remove !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'remove',\n      function() {\n        const wasConnected = Utilities.isConnected(this);\n\n        builtIn.remove.call(this);\n\n        if (wasConnected) {\n          internals.disconnectTree(this);\n        }\n      });\n  }\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\nimport PatchChildNode from './Interface/ChildNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  if (Native.Element_attachShadow) {\n    Utilities.setPropertyUnchecked(Element.prototype, 'attachShadow',\n      /**\n       * @this {Element}\n       * @param {!{mode: string}} init\n       * @return {ShadowRoot}\n       */\n      function(init) {\n        const shadowRoot = Native.Element_attachShadow.call(this, init);\n        this.__CE_shadowRoot = shadowRoot;\n        return shadowRoot;\n      });\n  }\n\n\n  function patch_innerHTML(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'innerHTML', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Element} */ function(htmlString) {\n        const isConnected = Utilities.isConnected(this);\n\n        // NOTE: In IE11, when using the native `innerHTML` setter, all nodes\n        // that were previously descendants of the context element have all of\n        // their children removed as part of the set - the entire subtree is\n        // 'disassembled'. This work around walks the subtree *before* using the\n        // native setter.\n        /** @type {!Array<!Element>|undefined} */\n        let removedElements = undefined;\n        if (isConnected) {\n          removedElements = [];\n          Utilities.walkDeepDescendantElements(this, element => {\n            if (element !== this) {\n              removedElements.push(element);\n            }\n          });\n        }\n\n        baseDescriptor.set.call(this, htmlString);\n\n        if (removedElements) {\n          for (let i = 0; i < removedElements.length; i++) {\n            const element = removedElements[i];\n            if (element.__CE_state === CEState.custom) {\n              internals.disconnectedCallback(element);\n            }\n          }\n        }\n\n        // Only create custom elements if this element's owner document is\n        // associated with the registry.\n        if (!this.ownerDocument.__CE_hasRegistry) {\n          internals.patchTree(this);\n        } else {\n          internals.patchAndUpgradeTree(this);\n        }\n        return htmlString;\n      },\n    });\n  }\n\n  if (Native.Element_innerHTML && Native.Element_innerHTML.get) {\n    patch_innerHTML(Element.prototype, Native.Element_innerHTML);\n  } else if (Native.HTMLElement_innerHTML && Native.HTMLElement_innerHTML.get) {\n    patch_innerHTML(HTMLElement.prototype, Native.HTMLElement_innerHTML);\n  } else {\n\n    internals.addPatch(function(element) {\n      patch_innerHTML(element, {\n        enumerable: true,\n        configurable: true,\n        // Implements getting `innerHTML` by performing an unpatched `cloneNode`\n        // of the element and returning the resulting element's `innerHTML`.\n        // TODO: Is this too expensive?\n        get: /** @this {Element} */ function() {\n          return Native.Node_cloneNode.call(this, true).innerHTML;\n        },\n        // Implements setting `innerHTML` by creating an unpatched element,\n        // setting `innerHTML` of that element and replacing the target\n        // element's children with those of the unpatched element.\n        set: /** @this {Element} */ function(assignedValue) {\n          // NOTE: re-route to `content` for `template` elements.\n          // We need to do this because `template.appendChild` does not\n          // route into `template.content`.\n          const isTemplate = (this.localName === 'template');\n          /** @type {!Node} */\n          const content = isTemplate ? (/** @type {!HTMLTemplateElement} */\n            (this)).content : this;\n          /** @type {!Node} */\n          const rawElement = Native.Document_createElement.call(document,\n            this.localName);\n          rawElement.innerHTML = assignedValue;\n\n          while (content.childNodes.length > 0) {\n            Native.Node_removeChild.call(content, content.childNodes[0]);\n          }\n          const container = isTemplate ? rawElement.content : rawElement;\n          while (container.childNodes.length > 0) {\n            Native.Node_appendChild.call(content, container.childNodes[0]);\n          }\n        },\n      });\n    });\n  }\n\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttribute.call(this, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_setAttribute.call(this, name, newValue);\n      newValue = Native.Element_getAttribute.call(this, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, null);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(namespace, name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     */\n    function(name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttribute.call(this, name);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_removeAttribute.call(this, name);\n      if (oldValue !== null) {\n        internals.attributeChangedCallback(this, name, oldValue, null, null);\n      }\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     */\n    function(namespace, name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttributeNS.call(this, namespace, name);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_removeAttributeNS.call(this, namespace, name);\n      // In older browsers, `Element#getAttributeNS` may return the empty string\n      // instead of null if the attribute does not exist. For details, see;\n      // https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttributeNS#Notes\n      const newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      if (oldValue !== newValue) {\n        internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n      }\n    });\n\n\n  function patch_insertAdjacentElement(destination, baseMethod) {\n    Utilities.setPropertyUnchecked(destination, 'insertAdjacentElement',\n      /**\n       * @this {Element}\n       * @param {string} where\n       * @param {!Element} element\n       * @return {?Element}\n       */\n      function(where, element) {\n        const wasConnected = Utilities.isConnected(element);\n        const insertedElement = /** @type {!Element} */\n          (baseMethod.call(this, where, element));\n\n        if (wasConnected) {\n          internals.disconnectTree(element);\n        }\n\n        if (Utilities.isConnected(insertedElement)) {\n          internals.connectTree(element);\n        }\n        return insertedElement;\n      });\n  }\n\n  if (Native.HTMLElement_insertAdjacentElement) {\n    patch_insertAdjacentElement(HTMLElement.prototype, Native.HTMLElement_insertAdjacentElement);\n  } else if (Native.Element_insertAdjacentElement) {\n    patch_insertAdjacentElement(Element.prototype, Native.Element_insertAdjacentElement);\n  } else {\n    console.warn('Custom Elements: `Element#insertAdjacentElement` was not patched.');\n  }\n\n\n  PatchParentNode(internals, Element.prototype, {\n    prepend: Native.Element_prepend,\n    append: Native.Element_append,\n  });\n\n  PatchChildNode(internals, Element.prototype, {\n    before: Native.Element_before,\n    after: Native.Element_after,\n    replaceWith: Native.Element_replaceWith,\n    remove: Native.Element_remove,\n  });\n};\n","import CustomElementInternals from '../CustomElementInternals.js';\nimport Native from './Native.js';\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  PatchParentNode(internals, DocumentFragment.prototype, {\n    prepend: Native.DocumentFragment_prepend,\n    append: Native.DocumentFragment_append,\n  });\n};\n"]}
\ No newline at end of file

--- a/toolkit/components/payments/test/browser/browser_total.js
+++ b/toolkit/components/payments/test/browser/browser_total.js
@@ -1,18 +1,15 @@
 "use strict";
 
 /* eslint-disable mozilla/no-cpows-in-tests */
 add_task(async function test_total() {
   const testTask = ({methodData, details}) => {
-    is(content.document.querySelector("#total > .value").textContent,
-       details.total.amount.value,
-       "Check total value");
-    is(content.document.querySelector("#total > .currency").textContent,
-       details.total.amount.currency,
-       "Check currency");
+    is(content.document.querySelector("#total > currency-amount").textContent,
+       "$60.00",
+       "Check total currency amount");
   };
   const args = {
     methodData: [PTU.MethodData.basicCard],
     details: PTU.Details.total60USD,
   };
   await spawnInDialogForMerchantTask(PTU.ContentTasks.createRequest, testTask, args);
 });

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/test/mochitest/.eslintrc.js
@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = {
+  "extends": [
+    "plugin:mozilla/mochitest-test"
+  ],
+};

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/test/mochitest/mochitest.ini
@@ -0,0 +1,10 @@
+[DEFAULT]
+support-files =
+   ../../res/components/currency-amount.js
+   ../../res/mixins/ObservedPropertiesMixin.js
+   ../../res/vendor/custom-elements.min.js
+   ../../res/vendor/custom-elements.min.js.map
+   payments_common.js
+
+[test_currency_amount.html]
+[test_ObservedPropertiesMixin.html]

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/test/mochitest/payments_common.js
@@ -0,0 +1,12 @@
+"use strict";
+
+/* exported asyncElementRendered */
+
+/**
+ * A helper to await on while waiting for an asynchronous rendering of a Custom
+ * Element.
+ * @returns {Promise}
+ */
+function asyncElementRendered() {
+  return Promise.resolve();
+}

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/test/mochitest/test_ObservedPropertiesMixin.html
@@ -0,0 +1,119 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test the ObservedPropertiesMixin
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test the ObservedPropertiesMixin</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script src="payments_common.js"></script>
+  <script src="custom-elements.min.js"></script>
+  <script src="ObservedPropertiesMixin.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+  <p id="display">
+    <test-element id="el1" one="foo" two-word="bar"></test-element>
+  </p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+/** Test the ObservedPropertiesMixin **/
+
+/* import-globals-from payments_common.js */
+/* import-globals-from ../../res/mixins/ObservedPropertiesMixin.js */
+
+class TestElement extends ObservedPropertiesMixin(HTMLElement) {
+  static get observedAttributes() {
+    return ["one", "two-word"];
+  }
+
+  render() {
+    this.textContent = JSON.stringify({
+      one: this.one,
+      twoWord: this.twoWord,
+    });
+  }
+}
+
+customElements.define("test-element", TestElement);
+let el1 = document.getElementById("el1");
+
+add_task(async function test_default_properties() {
+  is(el1.one, "foo", "Check .one matches @one");
+  is(el1.twoWord, "bar", "Check .twoWord matches @two-word");
+  let expected = `{"one":"foo","twoWord":"bar"}`;
+  is(el1.textContent, expected, "Check textContent");
+});
+
+add_task(async function test_set_properties() {
+  el1.one = "a";
+  el1.twoWord = "b";
+  is(el1.one, "a", "Check .one value");
+  is(el1.getAttribute("one"), "a", "Check @one");
+  is(el1.twoWord, "b", "Check .twoWord value");
+  is(el1.getAttribute("two-word"), "b", "Check @two-word");
+  let expected = `{"one":"a","twoWord":"b"}`;
+  await asyncElementRendered();
+  is(el1.textContent, expected, "Check textContent");
+});
+
+add_task(async function test_set_attributes() {
+  el1.setAttribute("one", "X");
+  el1.setAttribute("two-word", "Y");
+  is(el1.one, "X", "Check .one value");
+  is(el1.getAttribute("one"), "X", "Check @one");
+  is(el1.twoWord, "Y", "Check .twoWord value");
+  is(el1.getAttribute("two-word"), "Y", "Check @two-word");
+  let expected = `{"one":"X","twoWord":"Y"}`;
+  await asyncElementRendered();
+  is(el1.textContent, expected, "Check textContent");
+});
+
+add_task(async function test_async_render() {
+  // Setup
+  el1.setAttribute("one", "1");
+  el1.setAttribute("two-word", "2");
+  await asyncElementRendered(); // Wait for the async render
+
+  el1.setAttribute("one", "new1");
+
+  is(el1.one, "new1", "Check .one value");
+  is(el1.getAttribute("one"), "new1", "Check @one");
+  is(el1.twoWord, "2", "Check .twoWord value");
+  is(el1.getAttribute("two-word"), "2", "Check @two-word");
+  let expected = `{"one":"1","twoWord":"2"}`;
+  is(el1.textContent, expected, "Check textContent is still old value due to async rendering");
+  await asyncElementRendered();
+  expected = `{"one":"new1","twoWord":"2"}`;
+  is(el1.textContent, expected, "Check textContent now has the new value");
+});
+
+add_task(async function test_batched_render() {
+  // Setup
+  el1.setAttribute("one", "1");
+  el1.setAttribute("two-word", "2");
+  await asyncElementRendered();
+
+  el1.setAttribute("one", "new1");
+  el1.setAttribute("two-word", "new2");
+
+  is(el1.one, "new1", "Check .one value");
+  is(el1.getAttribute("one"), "new1", "Check @one");
+  is(el1.twoWord, "new2", "Check .twoWord value");
+  is(el1.getAttribute("two-word"), "new2", "Check @two-word");
+  let expected = `{"one":"1","twoWord":"2"}`;
+  is(el1.textContent, expected, "Check textContent is still old value due to async rendering");
+  await asyncElementRendered();
+  expected = `{"one":"new1","twoWord":"new2"}`;
+  is(el1.textContent, expected, "Check textContent now has the new value");
+});
+</script>
+
+</body>
+</html>

new file mode 100644
--- /dev/null
+++ b/toolkit/components/payments/test/mochitest/test_currency_amount.html
@@ -0,0 +1,143 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test the currency-amount component
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test the currency-amount component</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script src="payments_common.js"></script>
+  <script src="custom-elements.min.js"></script>
+  <script src="ObservedPropertiesMixin.js"></script>
+  <script src="currency-amount.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+  <p id="display">
+    <currency-amount id="amount1"></currency-amount>
+  </p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+/** Test the currency-amount component **/
+
+/* import-globals-from payments_common.js */
+
+let amount1 = document.getElementById("amount1");
+
+add_task(async function test_no_value() {
+  ok(amount1, "amount1 exists");
+  is(amount1.textContent, "", "Initially empty");
+
+  amount1.currency = "USD";
+  await asyncElementRendered();
+  is(amount1.getAttribute("currency"), "USD", "Check @currency");
+  ok(!amount1.hasAttribute("value"), "Check @value");
+  is(amount1.currency, "USD", "Check .currency");
+  is(amount1.value, null, "Check .value");
+  is(amount1.textContent, "", "Empty while missing an amount");
+
+  amount1.currency = null;
+  await asyncElementRendered();
+  ok(!amount1.hasAttribute("currency"), "Setting to null should remove @currency");
+  ok(!amount1.hasAttribute("value"), "Check @value");
+  is(amount1.currency, null, "Check .currency");
+  is(amount1.value, null, "Check .value");
+});
+
+add_task(async function test_no_value() {
+  amount1.value = 1.23;
+  await asyncElementRendered();
+
+  is(amount1.getAttribute("value"), "1.23", "Check @value");
+  ok(!amount1.hasAttribute("currency"), "Check @currency");
+  is(amount1.currency, null, "Check .currency");
+  is(amount1.value, "1.23", "Check .value");
+  is(amount1.textContent, "", "Empty while missing a currency");
+
+  amount1.value = null;
+  await asyncElementRendered();
+  ok(!amount1.hasAttribute("value"), "Setting to null should remove @value");
+  is(amount1.currency, null, "Check .currency");
+  is(amount1.value, null, "Check .value");
+});
+
+add_task(async function test_valid_currency_amount_cad() {
+  amount1.value = 12.34;
+  info("waiting to set second property");
+  await asyncElementRendered();
+  amount1.currency = "CAD";
+  await asyncElementRendered();
+
+  is(amount1.getAttribute("value"), "12.34", "Check @value");
+  is(amount1.value, "12.34", "Check .value");
+  is(amount1.getAttribute("currency"), "CAD", "Check @currency");
+  is(amount1.currency, "CAD", "Check .currency");
+  is(amount1.textContent, "CA$12.34", "Check output format");
+});
+
+add_task(async function test_valid_currency_amount_eur_batched_prop() {
+  info("setting two properties in a row synchronously");
+  amount1.value = 98.76;
+  amount1.currency = "EUR";
+  await asyncElementRendered();
+
+  is(amount1.getAttribute("value"), "98.76", "Check @value");
+  is(amount1.value, "98.76", "Check .value");
+  is(amount1.getAttribute("currency"), "EUR", "Check @currency");
+  is(amount1.currency, "EUR", "Check .currency");
+  is(amount1.textContent, "€98.76", "Check output format");
+});
+
+add_task(async function test_valid_currency_amount_eur_batched_attr() {
+  info("setting two attributes in a row synchronously");
+  amount1.setAttribute("value", 11.88);
+  amount1.setAttribute("currency", "CAD");
+  await asyncElementRendered();
+
+  is(amount1.getAttribute("value"), "11.88", "Check @value");
+  is(amount1.value, "11.88", "Check .value");
+  is(amount1.getAttribute("currency"), "CAD", "Check @currency");
+  is(amount1.currency, "CAD", "Check .currency");
+  is(amount1.textContent, "CA$11.88", "Check output format");
+});
+
+add_task(async function test_invalid_currency() {
+  isnot(amount1.textContent, "", "Start with initial content");
+  amount1.value = 33.33;
+  amount1.currency = "__invalid__";
+  await asyncElementRendered();
+
+  is(amount1.getAttribute("value"), "33.33", "Check @value");
+  is(amount1.value, "33.33", "Check .value");
+  is(amount1.getAttribute("currency"), "__invalid__", "Check @currency");
+  is(amount1.currency, "__invalid__", "Check .currency");
+  is(amount1.textContent, "", "Invalid currency should clear output");
+});
+
+add_task(async function test_invalid_value() {
+  info("setting some initial values");
+  amount1.value = 4.56;
+  amount1.currency = "GBP";
+  await asyncElementRendered();
+  isnot(amount1.textContent, "", "Start with initial content");
+
+  info("setting an alphabetical invalid value");
+  amount1.value = "abcdef";
+  await asyncElementRendered();
+
+  is(amount1.getAttribute("value"), "abcdef", "Check @value");
+  is(amount1.value, "abcdef", "Check .value");
+  is(amount1.getAttribute("currency"), "GBP", "Check @currency");
+  is(amount1.currency, "GBP", "Check .currency");
+  is(amount1.textContent, "", "Invalid value should clear output");
+});
+</script>
+
+</body>
+</html>

--- a/toolkit/content/license.html
+++ b/toolkit/content/license.html
@@ -140,16 +140,17 @@
 #if defined(XP_WIN) || defined(XP_MACOSX) || defined(XP_LINUX)
       <li><a href="about:license#openvr">OpenVR License</a></li>
 #endif
       <li><a href="about:license#ordered-float">ordered-float License</a></li>
       <li><a href="about:license#owning_ref">owning_ref License</a></li>
       <li><a href="about:license#pbkdf2-sha256">pbkdf2_sha256 License</a></li>
       <li><a href="about:license#pdfium">PDFium License</a></li>
       <li><a href="about:license#phf">phf, phf_codegen, phf_generator, phf_shared License</a></li>
+      <li><a href="about:license#polymer">Polymer License</a></li>
       <li><a href="about:license#praton">praton License</a></li>
       <li><a href="about:license#praton1">praton and inet_ntop License</a></li>
       <li><a href="about:license#precomputed-hash">precomputed-hash License</a></li>
       <li><a href="about:license#qcms">qcms License</a></li>
       <li><a href="about:license#qrcode-generator">QR Code Generator License</a></li>
       <li><a href="about:license#raven-js">Raven.js License</a></li>
       <li><a href="about:license#react">React License</a></li>
       <li><a href="about:license#react-intl">React Intl License</a></li>
@@ -5299,16 +5300,54 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE F
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 </pre>
 
 
     <hr>
 
+    <h1><a id="polymer"></a>Polymer License</h1>
+
+    <p>This license applies to the file
+    <code>toolkit/components/payments/res/vendor/custom-elements.min.js</code>.</p>
+
+<pre>
+Copyright (c) 2014 The Polymer Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+</pre>
+
+
+    <hr>
+
     <h1><a id="precomputed-hash"></a>precomputed-hash License</h1>
 
     <p>This license applies to files in the directory
     <code>third_party/rust/precomputed-hash</code>.</p>
 
 <pre>
 MIT License