diff --git a/.gitignore b/.gitignore
index d86e5cf7..ba9db6f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,17 @@
-/node_modules
-/bower_components
-*.js
-*.js.map
-*.d.ts
+/node_modules/
+/lib/
+
+#Compiler Output
+lit-element.js
+lit-element.js.map
+lit-element.d.ts
+
+/test/**/*.d.ts
+/test/**/*.js
+/test/**/*.js.map
+
+/demo/**/*.d.ts
+/demo/**/*.js
+/demo/**/*.js.map
+
 !custom_typings/
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 030c2fc9..ca74667f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,8 @@ cache:
 before_script:
 - npm run lint
 script:
-- xvfb-run npm run test
-- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct -s 'windows 10/microsoftedge@15' -s 'windows 10/microsoftedge@17' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'os x 10.12/safari@10' -s 'os x 10.12/safari@11' -s 'Linux/chrome@41'; fi
+- xvfb-run npm run test -- -l chrome
+- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct -s 'windows 10/microsoftedge@15' -s 'windows 10/microsoftedge@17' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'os x 10.12/safari@10' -s 'macos 10.13/safari@11' -s 'Linux/chrome@41' -s 'Linux/firefox'; fi
 env:
   global:
   - secure: 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
diff --git a/README.md b/README.md
index 334dbd9c..e011f773 100644
--- a/README.md
+++ b/README.md
@@ -10,11 +10,47 @@
 
 LitElement uses [lit-html](https://github.com/Polymer/lit-html) to render into the
 element's [Shadow DOM](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM)
-and [Polymer's](https://github.com/Polymer/polymer)
-[PropertiesMixin](https://github.com/Polymer/polymer/blob/master/lib/mixins/properties-mixin.js)
-to help manage element properties and attributes. LitElement reacts to changes in properties
+and adds API to help manage element properties and attributes. LitElement reacts to changes in properties
 and renders declaratively using `lit-html`.
 
+  * **Setup properties:** LitElement supports observable properties that cause the element to update.
+  These properties can be declared in a few ways:
+
+    * As class fields with the `@property()` [decorator](https://github.com/tc39/proposal-decorators#decorators),
+    if you're using a compiler that supports them, like TypeScript or Babel.
+    * With a static `properties` getter.
+    * By manually writing getters and setters. This can be useful if tasks should
+    be performed when a property is set, for example validation. Call `invalidateProperty(name, oldValue)`
+    in the setter to trigger an update and use any configured property options.
+
+    Properties can be given an options argument which is an object that describes how to
+    process the property. This can be done either in the `@property({...})` decorator or in the
+    object returned from the `properties` getter, e.g. `static get properties { return { foo: {...} }`.
+
+    Property options include:
+
+    * `attribute`: Describes how and whether the property becomes an observed attribute.
+    If the value is `false`, the property is not added to `observedAttributes`.
+    If true or absent, the lowercased property name is observed (e.g. `fooBar` becomes `foobar`).
+    If a string, the string value is observed (e.g `attribute: 'foo-bar'`).
+    * `type`: Describes how to serialize and deserialize the attribute to/from a property.
+    If this value is a function, it is used to deserialize the attribute value
+    a the property value. If it's an object, it can have keys for `fromAttribute` and
+    `toAttribute` where `fromAttribute` is the deserialize function and `toAttribute`
+    is a serialize function used to set the property to an attribute. If no `toAttribute`
+    function is provided and `reflect` is set to `true`, the property value is set
+    directly to the attribute.
+    * `reflect`: Describes if the property should reflect to an attribute.
+    If `true`, when the property is set, the attribute is set using the
+    attribute name determined according to the rules for the `attribute`
+    propety option and the value of the property serialized using the rules from
+    the `type` property option.
+    * `shouldInvalidate`: Describes if setting a property should trigger
+    invalidation and updating. This function takes the `newValue` and `oldValue` and
+    returns `true` if invalidation should occur. If not present, a strict identity
+    check is used. This is useful if a property should be considered dirty only
+    if some condition is met, like if a key of an object value changes.
+
   * **React to changes:** LitElement reacts to changes in properties and attributes by
   asynchronously rendering, ensuring changes are batched. This reduces overhead
   and maintains consistent state.
@@ -27,8 +63,9 @@ and renders declaratively using `lit-html`.
 
     * static elements: ``` html`<div>Hi</div>` ```
     * expression: ``` html`<div>${disabled ? 'Off' : 'On'}</div>` ```
-    * attribute: ``` html`<div class$="${color} special"></div>` ```
-    * event handler: ``` html`<button on-click="${(e) => this._clickHandler(e)}"></button>` ```
+    * property: ``` html`<x-foo .bar="${bar}"></x-foo>` ```
+    * attribute: ``` html`<div class="${color} special"></div>` ```
+    * event handler: ``` html`<button @click="${(e) => this._clickHandler(e)}"></button>` ```
 
 ## Getting started
 
@@ -68,24 +105,25 @@ and renders declaratively using `lit-html`.
 ## Minimal Example
 
   1. Create a class that extends `LitElement`.
-  1. Implement a static `properties` getter that returns the element's properties
-  (which automatically become observed attributes).
-  1. Then implement a `_render(props)` method and use the element's
-current properties (props) to return a `lit-html` template result to render
+  1. Use a `@property` decorator to create a property (or implement a static `properties`
+  getter that returns the element's properties). (which automatically become observed attributes).
+  1. Then implement a `render()` method and use the element's
+current properties to return a `lit-html` template result to render
 into the element. This is the only method that must be implemented by subclasses.
 
 ```html
   <script src="node_modules/@webcomponents/webcomponents-bundle.js"></script>
   <script type="module">
-    import {LitElement, html} from '@polymer/lit-element';
+    import {LitElement, html, property} from '@polymer/lit-element';
 
     class MyElement extends LitElement {
 
-      static get properties() { return { mood: String }}
+      @property({type: String})
+      mood = 'happy';
 
-      _render({mood}) {
+      render() {
         return html`<style> .mood { color: green; } </style>
-          Web Components are <span class="mood">${mood}</span>!`;
+          Web Components are <span class="mood">${this.mood}</span>!`;
       }
 
     }
@@ -98,69 +136,101 @@ into the element. This is the only method that must be implemented by subclasses
 
 ## API Documentation
 
-See the [source](https://github.com/PolymerLabs/lit-element/blob/master/src/lit-element.ts#L90)
- for detailed API info, here are some highlights. Note, the leading underscore
- is used to indicate that these methods are
- [protected](https://en.wikipedia.org/wiki/Class_(computer_programming)#Member_accessibility);
- they are not private and can and should be implemented by subclasses.
- These methods generally are called as part of the rendering lifecycle and should
- not be called in user code unless otherwise indicated.
+  * `render()` (protected): Implement to describe the element's DOM using `lit-html`. Ideally,
+  the `render` implementation is a [pure function](https://en.wikipedia.org/wiki/Pure_function) using only the element's current properties
+  to describe the element template. This is the only method that must be implemented by subclasses.
+  Note, since `render()` is called by `update()`, setting properties does not trigger
+  `invalidate()`, allowing property values to be computed and validated.
 
-  * `_createRoot()`: Implement to customize where the
+  * `shouldUpdate(changedProperties)` (protected): Implement to control if updating and rendering
+  should occur when property values change or `invalidate` is called. The `changedProperties`
+  argument is an object with keys for the changed properties pointing to their previous values.
+  By default, this method always returns true, but this can be customized as
+  an optimization to avoid updating work when changes occur, which should not be rendered.
+
+  * `update()` (protected): This method calls `render()` and then uses `lit-html` in order to
+  render the template DOM. Implement to directly control rendered DOM.
+  Typically this is not needed as `lit-html` can be used in the `render` method
+  to set properties, attributes, and event listeners. However, it is sometimes useful
+  for calling methods on rendered elements, for example focusing an input:
+  `this.shadowRoot.querySelector('input').focus()`. The `changedProperties` argument is a Map
+  with keys for the changed properties pointing to their previous values.
+  Note, calling `super.update()` is required. Before calling `super.update()`,
+  changes made to properties do not trigger `invalidate()`, after calling `super.update()`,
+  changes do trigger `invalidate()`.
+
+  * `firstRendered()`: (protected) Called after the element's DOM has been
+  updated the first time. This method can be useful for capturing references to rendered static
+  nodes that must be directly acted upon, for example in `update()`.
+
+  * `updateComplete`:  Returns a Promise that resolves when the element has completed
+  updating that resolves to a boolean value that is `true` if the element completed the
+  update without triggering another update. This can happen if a property is set in
+  `update()` after the call to `super.update()` for example. This getter can be
+  implemented to await additional state. For example, it is sometimes useful to
+  await a rendered element before fulfilling this promise. To do this, first
+  await `super.updateComplete` then any subsequent state.
+
+  * `invalidate`: Call to request the element to asynchronously update regardless
+  of whether or not any property changes are pending. This should only be called
+  when an element should update based on some state not stored in properties,
+  since setting properties automically calls `invalidate`.
+
+  * `invalidateProperty(name, oldValue)` (protected): Triggers an invalidation for
+  a specific property. This is useful when manually implementing a property setter.
+  Call `invalidateProperty` instead of `invalidate` to ensure that any configured
+  property options are honored.
+
+  * `createRenderRoot()` (protected): Implement to customize where the
   element's template is rendered by returning an element into which to
   render. By default this creates a shadowRoot for the element.
   To render into the element's childNodes, return `this`.
 
-  * `_firstRendered()`: Called after the element DOM is rendered for the first time.
-
-  * `_shouldRender(props, changedProps, prevProps)`: Implement to control if rendering
-  should occur when property values change or `invalidate` is called.
-  By default, this method always returns true, but this can be customized as
-  an optimization to avoid rendering work when changes occur which should not be rendered.
-
-  * `_render(props)`: Implement to describe the element's DOM using `lit-html`. Ideally,
-  the `_render` implementation is a pure function using only `props` to describe
-  the element template. This is the only method that must be implemented by subclasses.
-
-  * `_didRender(props, changedProps, prevProps)`: Called after element DOM has been rendered.
-  Implement to directly control rendered DOM. Typically this is not needed as `lit-html`
-  can be used in the `_render` method to set properties, attributes, and
-  event listeners. However, it is sometimes useful for calling methods on
-  rendered elements, for example focusing an input:
-  `this.shadowRoot.querySelector('input').focus()`.
-
-  * `renderComplete`: Returns a promise which resolves after the element next renders.
-
-  * `_requestRender`: Call to request the element to asynchronously re-render regardless
-  of whether or not any property changes are pending.
+## Advanced: Update Lifecycle
+
+* When the element is first connected or a property is set (e.g. `element.foo = 5`)
+and the property's `shouldInvalidate(value, oldValue)` returns true.
+* `invalidate()`: Updates the element after waiting a [microtask](https://jakearchibald.com/2015/tasks-microtasks-queues-and-schedules/) (at the end
+of the event loop, before the next paint).
+* `shouldUpdate(changedProperties)`: The update proceeds if this returns true, which
+it does by default.
+* `update(changedProperties)`: Updates the element. Setting properties inside
+update is handled specially. Before calling `super.update()`, setting properties
+will *not* trigger an update. After calling `super.update()` setting properties will
+trigger an update.
+  * `render()`: Returns a `lit-html` TemplateResult (e.g. <code>html\`Hello ${world}\`</code>)
+  to render element DOM. Setting properties in `render()` does not trigger an update.
+  * `firstRendered()`: Called after the DOM is rendered the first time.
+  Setting properties in `firstRendered()` does trigger an update.
+* `updateComplete` promise is resolved with a boolean that is `true` if the
+element is not pending another update, and any code awaiting the element's
+`updateComplete` promise runs and observes the element in the updated state.
 
 ## Bigger Example
 
 ```JavaScript
-import {LitElement, html} from '@polymer/lit-element';
+import {LitElement, html, property} from '@polymer/lit-element';
 
 class MyElement extends LitElement {
 
   // Public property API that triggers re-render (synced with attributes)
-  static get properties() {
-    return {
-      foo: String,
-      whales: Number
-    }
-  }
+  @property()
+  foo = 'foo';
+
+  @property({type: Number})
+  whales = 5;
 
   constructor() {
     super();
-    this.foo = 'foo';
     this.addEventListener('click', async (e) => {
       this.whales++;
-      await this.renderComplete;
+      await this.updateComplete;
       this.dispatchEvent(new CustomEvent('whales', {detail: {whales: this.whales}}))
     });
   }
 
   // Render method should return a `TemplateResult` using the provided lit-html `html` tag function
-  _render({foo, whales}) {
+  render() {
     return html`
       <style>
         :host {
@@ -170,8 +240,8 @@ class MyElement extends LitElement {
           display: none;
         }
       </style>
-      <h4>Foo: ${foo}</h4>
-      <div>whales: ${'🐳'.repeat(whales)}</div>
+      <h4>Foo: ${this.foo}</h4>
+      <div>whales: ${'🐳'.repeat(this.whales)}</div>
       <slot></slot>
     `;
   }
diff --git a/demo/lit-element.html b/demo/lit-element.html
index d1c13827..60d0d0dd 100644
--- a/demo/lit-element.html
+++ b/demo/lit-element.html
@@ -11,38 +11,61 @@
   <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
   <title>lit-element demo</title>
   <script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-bundle.js"></script>
+  <script type="module" src = "./ts-element.js"></script>
 </head>
 <body>
+    <my-element bar="5" whales="5" foobar="17">Hi</my-element>
+    <hr>
+    <ts-element message="Yo" more-info="person"></ts-element>
+
   <script type="module">
     import { LitElement, html } from '../lit-element.js';
 
+    class Inner extends LitElement {
+      render() {
+        return html`Hello world`;
+      }
+    }
+
+    customElements.define('x-inner', Inner);
+
     class MyElement extends LitElement {
 
       static get properties() {
         return {
-          foo: String,
-          bar: Number,
-          whales: Number
+          nug: {},
+          zot: {},
+          foo: {},
+          bar: {},
+          whales: {type: Number},
+          fooBar: {type: {fromAttribute: parseInt, toAttribute: (value) => value + '-attr'}, reflect: true}
         }
       }
 
+      // a custom getter/setter can be created to customize property processing
+      get zot() { return this.getAttribute('zot'); }
+
+      set zot(value) {
+        this.setAttribute('zot', value);
+        this.invalidate();
+      }
+
+
       constructor() {
         super();
         this.foo = 'foo';
+        this.nug = [1, 2, 3];
         this.whales = 0;
         this.addEventListener('click', async (e) => {
           this.whales++;
-          await this.renderComplete;
+          await this.updateComplete;
           this.dispatchEvent(new CustomEvent('whales', {detail: {whales: this.whales}}))
           console.log(this.shadowRoot.querySelector('.count').textContent);
         });
       }
 
-      _firstRendered() {
-        console.log('first rendered!');
-      }
-
-      _render({foo, bar, whales}) {
+      render() {
+        const {foo, bar, whales, fooBar, nug} = this;
         return html`
           <style>
             :host {
@@ -69,16 +92,35 @@ <h4 on-click="${(e) => console.log(this, e.target)}">Foo: ${foo}, Bar: ${bar}</h
           <div class="count">
             whales: ${'🐳'.repeat(whales)}
           </div>
+          <ul>
+          ${nug.map(n => html`<li>${n}</li>`)}
+          </ul>
+          <x-inner></x-inner>
         `;
       }
 
-      _didRender() {
-        console.log('didRender!');
+      update(changedProps) {
+        super.update(changedProps);
+        console.log('updated!', changedProps);
       }
 
+      firstRendered() {
+        this._inner = this.shadowRoot.querySelector('x-inner');
+      }
+
+      get updateComplete() {
+        return (async () => {
+          return await super.updateComplete && await this._inner.updateComplete;
+        })();
+      };
     }
 
     customElements.define('my-element', MyElement);
+
+    (async () => {
+      const x = document.querySelector('my-element');
+      await x.updateComplete;
+      console.log('updateComplete!', x.shadowRoot.querySelector('x-inner').shadowRoot.textContent, x.whales);
+    })();
   </script>
-  <my-element bar="5" whales="5">Hi</my-element>
 </body></html>
diff --git a/package-lock.json b/package-lock.json
index db95284b..58f361b6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,36 +1,35 @@
 {
   "name": "@polymer/lit-element",
-  "version": "0.5.2",
+  "version": "0.6.0-dev.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.0.0-beta.51",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.51.tgz",
-      "integrity": "sha1-vXHZsZKvl435FYKdOdQJRFZDmgw=",
+      "version": "7.0.0-rc.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-rc.1.tgz",
+      "integrity": "sha512-qhQo3GqwqMUv03SxxjcEkWtlkEDvFYrBKbJUn4Dtd9amC2cLkJ3me4iYUVSBbVXWbfbVRalEeVBHzX4aQYKnBg==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "7.0.0-beta.51"
+        "@babel/highlight": "7.0.0-rc.1"
       }
     },
     "@babel/core": {
-      "version": "7.0.0-beta.51",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.0.0-beta.51.tgz",
-      "integrity": "sha1-DlS9a2OHNrKuWTwxpH8JaeKyuW0=",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "7.0.0-beta.51",
-        "@babel/generator": "7.0.0-beta.51",
-        "@babel/helpers": "7.0.0-beta.51",
-        "@babel/parser": "7.0.0-beta.51",
-        "@babel/template": "7.0.0-beta.51",
-        "@babel/traverse": "7.0.0-beta.51",
-        "@babel/types": "7.0.0-beta.51",
+      "version": "7.0.0-rc.1",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.0.0-rc.1.tgz",
+      "integrity": "sha512-CvuSsq+LFs9N4SJG8MnNPI0hnl913HK1OqG3NEfejOKo+JqtVuxpmAFyXIDogX2x668xqFKAW6EQiCIcUHklMg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.0.0-rc.1",
+        "@babel/generator": "7.0.0-rc.1",
+        "@babel/helpers": "7.0.0-rc.1",
+        "@babel/parser": "7.0.0-rc.1",
+        "@babel/template": "7.0.0-rc.1",
+        "@babel/traverse": "7.0.0-rc.1",
+        "@babel/types": "7.0.0-rc.1",
         "convert-source-map": "^1.1.0",
         "debug": "^3.1.0",
         "json5": "^0.5.0",
-        "lodash": "^4.17.5",
-        "micromatch": "^3.1.10",
+        "lodash": "^4.17.10",
         "resolve": "^1.3.2",
         "semver": "^5.4.1",
         "source-map": "^0.5.0"
@@ -45,14 +44,14 @@
       }
     },
     "@babel/generator": {
-      "version": "7.0.0-beta.51",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.51.tgz",
-      "integrity": "sha1-bHV1/952HQdIXgS67cA5LG2eMPY=",
+      "version": "7.0.0-rc.1",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-rc.1.tgz",
+      "integrity": "sha512-Ak4n780/coo+L9GZUS7V/IGJilP11t4UoWl0J9cG3jso4KkDGQcqdx4Y6gJAiXng+sDfvzUmvWfM1hZwH82J0A==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.0.0-beta.51",
+        "@babel/types": "7.0.0-rc.1",
         "jsesc": "^2.5.1",
-        "lodash": "^4.17.5",
+        "lodash": "^4.17.10",
         "source-map": "^0.5.0",
         "trim-right": "^1.0.1"
       },
@@ -66,33 +65,33 @@
       }
     },
     "@babel/helper-annotate-as-pure": {
-      "version": "7.0.0-beta.51",
-      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0-beta.51.tgz",
-      "integrity": "sha1-OM95IL9fM4oif3VOKGtvut7gS1g=",
+      "version": "7.0.0-rc.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0-rc.1.tgz",
+      "integrity": "sha512-GOV2UExs9gAvSrZF4rcgocXXeLJplq2kL2AsCrn6DmGwMUEfo/KB7FhedN3X6cVh0gOqqKkVKXrz3Li1wQ84xQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.0.0-beta.51"
+        "@babel/types": "7.0.0-rc.1"
       }
     },
     "@babel/helper-builder-binary-assignment-operator-visitor": {
-      "version": "7.0.0-beta.51",
-      "resolved": "https://registry.npmjs.org/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.0.0-beta.51.tgz",
-      "integrity": "sha1-ITP//j4vcVkeQhR7lHKRyirTkjc=",
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-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-          "dev": true,
-          "optional": true
-        },
-        "uuid": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
-          "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
-          "dev": true,
-          "optional": true
-        }
+        "uuid": "^3.2.1"
       }
     },
     "wd": {
-      "version": "1.9.0",
-      "resolved": "https://registry.npmjs.org/wd/-/wd-1.9.0.tgz",
-      "integrity": "sha512-etqaVS5YFPuwaBRXNFnG0UIoCJHIPoWbVgdbK0v8MQRPQx2sNJc/wu0cRzLEuQjhGt/b0NGxcO1CvA5IAqoWrg==",
+      "version": "1.10.3",
+      "resolved": "https://registry.npmjs.org/wd/-/wd-1.10.3.tgz",
+      "integrity": "sha512-ffqqZDtFFLeg5u/4pw2vYKECW+z+vW6vc+7rcqF15uu1/rmw3BydV84BONNc9DIcQ5Z7gQFS/hAuMvj53eVtSg==",
       "dev": true,
       "requires": {
         "archiver": "2.1.1",
@@ -9654,7 +9769,6 @@
         "mkdirp": "^0.5.1",
         "q": "1.4.1",
         "request": "2.85.0",
-        "underscore.string": "3.3.4",
         "vargs": "0.1.0"
       },
       "dependencies": {
@@ -9706,9 +9820,9 @@
       }
     },
     "web-component-tester": {
-      "version": "6.6.0",
-      "resolved": "https://registry.npmjs.org/web-component-tester/-/web-component-tester-6.6.0.tgz",
-      "integrity": "sha512-f+LqR4rHUtVIg6T79uo6BYuyrIOzInPWzOJo69sGxX3tRTDeTwQzJSrfX4/MKA4qa3ldGPODJHizRYgZbjYjbQ==",
+      "version": "6.8.0",
+      "resolved": "https://registry.npmjs.org/web-component-tester/-/web-component-tester-6.8.0.tgz",
+      "integrity": "sha512-zj1nZ7dq270svfkdPo4Mc4CuCTab/Wp0SMIKb8g6xD0Q76g15ttHyscYAxQkywVuabwgWeTXiotUOiQaiwX8uA==",
       "dev": true,
       "requires": {
         "@polymer/sinonjs": "^1.14.1",
@@ -9718,18 +9832,15 @@
         "async": "^2.4.1",
         "body-parser": "^1.17.2",
         "bower-config": "^1.4.0",
-        "chai": "^4.0.2",
         "chalk": "^1.1.3",
         "cleankill": "^2.0.0",
         "express": "^4.15.3",
         "findup-sync": "^2.0.0",
         "glob": "^7.1.2",
         "lodash": "^3.10.1",
-        "mocha": "^3.4.2",
         "multer": "^1.3.0",
         "nomnom": "^1.8.1",
         "polyserve": "^0.27.11",
-        "promisify-node": "^0.4.0",
         "resolve": "^1.5.0",
         "semver": "^5.3.0",
         "send": "^0.11.1",
@@ -9739,8 +9850,8 @@
         "socket.io": "^2.0.3",
         "stacky": "^1.3.1",
         "update-notifier": "^2.2.0",
-        "wct-local": "^2.1.0",
-        "wct-sauce": "^2.0.0",
+        "wct-local": "^2.1.1",
+        "wct-sauce": "^2.0.2",
         "wd": "^1.2.0"
       },
       "dependencies": {
@@ -9751,9 +9862,9 @@
           "dev": true
         },
         "@webcomponents/webcomponentsjs": {
-          "version": "1.2.2",
-          "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-1.2.2.tgz",
-          "integrity": "sha512-VQlEKZwJFBz4x7VwYdZYeCNYvF39hJHoaGKfcKnv6u01tkXK9c0UCl1Zx4yBrMF+H1+rFvX6PLzDLFgUvZagmQ==",
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-1.2.5.tgz",
+          "integrity": "sha512-rhjKZIf9y0kIV3nHyK8qXWN6mactYEzCqZlBjSptkAp9gsYmuUJq4JYwoPl5KHOSk+cTvPXfLDZ0Gru8TDgiVQ==",
           "dev": true
         },
         "async": {
@@ -9773,12 +9884,6 @@
             }
           }
         },
-        "browser-stdout": {
-          "version": "1.3.0",
-          "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
-          "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
-          "dev": true
-        },
         "chalk": {
           "version": "1.1.3",
           "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -9792,30 +9897,6 @@
             "supports-color": "^2.0.0"
           }
         },
-        "commander": {
-          "version": "2.9.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
-          "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
-          "dev": true,
-          "requires": {
-            "graceful-readlink": ">= 1.0.0"
-          }
-        },
-        "debug": {
-          "version": "2.6.8",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
-          "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
-          "dev": true,
-          "requires": {
-            "ms": "2.0.0"
-          }
-        },
-        "diff": {
-          "version": "3.2.0",
-          "resolved": "https://registry.npmjs.org/diff/-/diff-3.2.0.tgz",
-          "integrity": "sha1-yc45Okt8vQsFinJck98pkCeGj/k=",
-          "dev": true
-        },
         "formatio": {
           "version": "1.2.0",
           "resolved": "https://registry.npmjs.org/formatio/-/formatio-1.2.0.tgz",
@@ -9825,18 +9906,6 @@
             "samsam": "1.x"
           }
         },
-        "growl": {
-          "version": "1.9.2",
-          "resolved": "https://registry.npmjs.org/growl/-/growl-1.9.2.tgz",
-          "integrity": "sha1-Dqd0NxXbjY3ixe3hd14bRayFwC8=",
-          "dev": true
-        },
-        "has-flag": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-1.0.0.tgz",
-          "integrity": "sha1-nZ55MWXOAXoA8AQYxD+UKnsdEfo=",
-          "dev": true
-        },
         "isarray": {
           "version": "0.0.1",
           "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
@@ -9855,51 +9924,6 @@
           "integrity": "sha1-OpoCg0UqR9dDnnJzG54H1zhuSfY=",
           "dev": true
         },
-        "mocha": {
-          "version": "3.5.3",
-          "resolved": "https://registry.npmjs.org/mocha/-/mocha-3.5.3.tgz",
-          "integrity": "sha512-/6na001MJWEtYxHOV1WLfsmR4YIynkUEhBwzsb+fk2qmQ3iqsi258l/Q2MWHJMImAcNpZ8DEdYAK72NHoIQ9Eg==",
-          "dev": true,
-          "requires": {
-            "browser-stdout": "1.3.0",
-            "commander": "2.9.0",
-            "debug": "2.6.8",
-            "diff": "3.2.0",
-            "escape-string-regexp": "1.0.5",
-            "glob": "7.1.1",
-            "growl": "1.9.2",
-            "he": "1.1.1",
-            "json3": "3.3.2",
-            "lodash.create": "3.1.1",
-            "mkdirp": "0.5.1",
-            "supports-color": "3.1.2"
-          },
-          "dependencies": {
-            "glob": {
-              "version": "7.1.1",
-              "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.1.tgz",
-              "integrity": "sha1-gFIR3wT6rxxjo2ADBs31reULLsg=",
-              "dev": true,
-              "requires": {
-                "fs.realpath": "^1.0.0",
-                "inflight": "^1.0.4",
-                "inherits": "2",
-                "minimatch": "^3.0.2",
-                "once": "^1.3.0",
-                "path-is-absolute": "^1.0.0"
-              }
-            },
-            "supports-color": {
-              "version": "3.1.2",
-              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.1.2.tgz",
-              "integrity": "sha1-cqJiiU2dQIuVbKBf83su2KbiotU=",
-              "dev": true,
-              "requires": {
-                "has-flag": "^1.0.0"
-              }
-            }
-          }
-        },
         "path-to-regexp": {
           "version": "1.7.0",
           "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-1.7.0.tgz",
@@ -9965,6 +9989,21 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
+      "dev": true
+    },
+    "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"
+      }
+    },
     "widest-line": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.0.tgz",
@@ -10010,15 +10049,13 @@
       "dev": true
     },
     "wordwrapjs": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-2.0.0.tgz",
-      "integrity": "sha1-q1X2leYRjak4WP3XDAU9HF4BrCA=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-3.0.0.tgz",
+      "integrity": "sha512-mO8XtqyPvykVCsrwj5MlOVWvSnCdT+C+QVbm6blradR7JExAhbkZ7hZ9A+9NUtwzSqrlUo9a67ws0EiILrvRpw==",
       "dev": true,
       "requires": {
-        "array-back": "^1.0.3",
-        "feature-detect-es6": "^1.3.1",
         "reduce-flatten": "^1.0.1",
-        "typical": "^2.6.0"
+        "typical": "^2.6.1"
       }
     },
     "wrappy": {
@@ -10101,9 +10138,9 @@
       }
     },
     "yauzl": {
-      "version": "2.9.2",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.9.2.tgz",
-      "integrity": "sha1-T7G8euH8L1cDe1SvasyP4QMcW3c=",
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
       "dev": true,
       "optional": true,
       "requires": {
diff --git a/package.json b/package.json
index 98fdf50e..053b0809 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polymer/lit-element",
-  "version": "0.5.2",
+  "version": "0.6.0-dev.5",
   "description": "Polymer based lit-html custom element",
   "license": "BSD-3-Clause",
   "repository": "Polymer/lit-element",
@@ -13,7 +13,7 @@
     "build": "tsc",
     "gen-docs": "typedoc --readme none --mode modules --excludeNotExported --excludePrivate --exclude **/*_test.ts --out ./docs/api .",
     "test": "npm run build && wct",
-    "checksize": "uglifyjs lit-element.js -mc --toplevel | gzip -9 | wc -c",
+    "checksize": "rollup -c ; rm lit-element.bundled.js",
     "format": "find src test | grep '\\.js$\\|\\.ts$' | xargs clang-format --style=file -i",
     "lint": "tslint --project ./",
     "prepublishOnly": "npm run build",
@@ -22,21 +22,23 @@
   "author": "The Polymer Authors",
   "devDependencies": {
     "@types/chai": "^4.0.1",
-    "@types/mocha": "^5.0.0",
-    "@webcomponents/webcomponentsjs": "^2.0.2",
+    "@types/mocha": "^5.2.4",
+    "@webcomponents/webcomponentsjs": "^2.1.0",
     "chai": "^4.0.2",
     "mocha": "^5.0.5",
+    "rollup": "^0.64.1",
+    "rollup-plugin-filesize": "^4.0.1",
+    "rollup-plugin-terser": "^1.0.1",
     "tslint": "^5.7.0",
     "typedoc": "^0.8.0",
-    "typescript": "^2.7.2",
+    "typescript": "^3.0.1",
     "uglify-es": "^3.3.9",
     "wct-browser-legacy": "^1.0.1",
-    "web-component-tester": "^6.6.0"
+    "web-component-tester": "^6.8.0"
   },
   "typings": "lit-element.d.ts",
   "dependencies": {
-    "@polymer/polymer": "^3.0.2",
-    "lit-html": "^0.10.2"
+    "lit-html": ">=0.11.0-dev.3 <2.0.0"
   },
   "publishConfig": {
     "access": "public"
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 00000000..1703cecf
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright (c) 2018 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
+ */
+
+import filesize from 'rollup-plugin-filesize';
+import {terser} from 'rollup-plugin-terser';
+
+export default {
+  input: 'lit-element.js',
+  output: {
+    file: 'lit-element.bundled.js',
+    format: 'esm',
+  },
+  onwarn(warning) {
+    if (warning.code !== 'CIRCULAR_DEPENDENCY') {
+      console.error(`(!) ${warning.message}`);
+    }
+  },
+  plugins: [
+    terser({
+      warnings: true,
+      mangle: {
+        module: true,
+      },
+    }),
+    filesize({
+      showBrotliSize: true,
+    })
+  ]
+}
\ No newline at end of file
diff --git a/src/demo/ts-element.ts b/src/demo/ts-element.ts
new file mode 100644
index 00000000..093808c1
--- /dev/null
+++ b/src/demo/ts-element.ts
@@ -0,0 +1,23 @@
+import { LitElement, html, property } from '../lit-element.js';
+
+class TSElement extends LitElement {
+
+  @property()
+  message = 'Hi';
+
+  @property({attribute: 'more-info', type: (value: string) => `[${value}]`})
+  extra = '';
+
+  render() {
+    const {message, extra} = this;
+    return html`
+      <style>
+        :host {
+          display: block;
+        }
+      </style>TSElement says: ${message} ${extra}
+    `;
+  }
+
+}
+customElements.define('ts-element', TSElement);
\ No newline at end of file
diff --git a/src/lib/render-helpers.ts b/src/lib/render-helpers.ts
new file mode 100644
index 00000000..3f18737c
--- /dev/null
+++ b/src/lib/render-helpers.ts
@@ -0,0 +1,52 @@
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at
+ * http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at
+ * http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at
+ * http://polymer.github.io/PATENTS.txt
+ */
+
+/**
+ * Returns a string of CSS class names formed by taking the properties
+ * in the `classInfo` object and appending the property name to the string of
+ * class names if the property value is truthy.
+ * @param classInfo
+ */
+export function classString(
+    classInfo: {[name: string]: string|boolean|number}) {
+  const o = [];
+  for (const name in classInfo) {
+    // We explicitly want a loose truthy check here because
+    // it seems more convenient that '' and 0 are skipped.
+    if (classInfo[name]) {
+      o.push(name);
+    }
+  }
+  return o.join(' ');
+}
+
+/**
+ * Returns a CSS style string formed from the `styleInfo` object. Property names
+ * are automatically converted from *camelCase* to *dash-case*, so that you can use
+ * unquoted names like `backgroundColor`. The property values are formatted
+ * as css. For example `{backgroundColor: 'red', borderTop: '5px'}` becomes
+ * `background-color: red; border-top: 5px;`.
+ * @param styleInfo
+ */
+export function styleString(
+    styleInfo: {[name: string]: string|boolean|number}) {
+  const o = [];
+  for (const name in styleInfo) {
+    const v = styleInfo[name];
+    if (v || v === 0) {
+      o.push(`${name.replace(/([A-Z])/, '-$1').toLowerCase()}: ${v}`);
+    }
+  }
+  return o.join('; ');
+}
diff --git a/src/lib/updating-element.ts b/src/lib/updating-element.ts
new file mode 100644
index 00000000..14886c64
--- /dev/null
+++ b/src/lib/updating-element.ts
@@ -0,0 +1,550 @@
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at
+ * http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at
+ * http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at
+ * http://polymer.github.io/PATENTS.txt
+ */
+
+/**
+ * Converts property values to and from attribute values.
+ */
+interface AttributeSerializer<T = any> {
+
+  /**
+   * Deserializing function called to convert an attribute value to a property value.
+   */
+  fromAttribute?(value: string): T;
+
+  /**
+   * Serializing function called to convert a property value to an attribute value.
+   */
+  toAttribute?(value: T): string|null;
+
+}
+
+type AttributeType<T = any> = AttributeSerializer<T>|((value: string) => T);
+
+/**
+ * Defines options for a property accessor.
+ */
+export interface PropertyDeclaration<T = any> {
+
+  /**
+   * Describes how and whether the property becomes an observed attribute.
+   * If the value is `false`, the property is not added to `observedAttributes`.
+   * If true or absent, the lowercased property name is observed (e.g. `fooBar` becomes `foobar`).
+   * If a string, the string value is observed (e.g `attribute: 'foo-bar'`).
+   */
+  attribute?: boolean|string;
+
+  /**
+   * Describes how to serialize and deserialize the attribute to/from a property.
+   * If this value is a function, it is used to deserialize the attribute value
+   * a the property value. If it's an object, it can have keys for `fromAttribute` and
+   * `toAttribute` where `fromAttribute` is the deserialize function and `toAttribute`
+   * is a serialize function used to set the property to an attribute. If no `toAttribute`
+   * function is provided and `reflect` is set to `true`, the property value is set
+   * directly to the attribute.
+   */
+  type?: AttributeType<T>;
+
+  /**
+   * Describes if the property should reflect to an attribute.
+   * If `true`, when the property is set, the attribute is set using the
+   * attribute name determined according to the rules for the `attribute`
+   * propety option and the value of the property serialized using the rules from
+   * the `type` property option.
+   */
+  reflect?: boolean;
+
+  /**
+   * Describes if setting a property should trigger invalidation and updating.
+   * This function takes the `newValue` and `oldValue` and returns `true` if
+   * invalidation should occur. If not present, a strict identity check
+   * (eg. === operator) is used. This is useful if a property should be
+   * considered dirty only if some condition is met, like if a key of an
+   * object value changes.
+   */
+  shouldInvalidate?(value: T, oldValue: T): boolean;
+
+}
+
+/**
+ * Map of properties to PropertyDeclaration options. For each property an
+ * accessor is made, and the property is processed according to the
+ * PropertyDeclaration options.
+ */
+export interface PropertyDeclarations {
+  [key: string]: PropertyDeclaration;
+}
+
+type PropertyDeclarationMap = Map<PropertyKey, PropertyDeclaration>;
+
+type AttributeMap = Map<string, PropertyKey>;
+
+export type PropertyValues = Map<PropertyKey, unknown>;
+
+/**
+ * Decorator which creates a property. Optionally a `PropertyDeclaration` object
+ * can be supplied to describe how the property should be configured.
+ */
+export const property = (options?: PropertyDeclaration) => (proto: Object, name: string) => {
+  (proto.constructor as typeof UpdatingElement).createProperty(name, options);
+};
+
+// serializer/deserializers for boolean attribute
+const fromBooleanAttribute = (value: string) => value !== null;
+const toBooleanAttribute = (value: string) => value ? '' : null;
+
+export interface ShouldInvalidate {
+  (value: unknown, old: unknown): boolean;
+}
+
+/**
+ * Change function that returns true if `value` is different from `oldValue`.
+ * This method is used as the default for a property's `shouldInvalidate` function.
+ */
+export const notEqual: ShouldInvalidate = (value: unknown, old: unknown): boolean => {
+  // This ensures (old==NaN, value==NaN) always returns false
+  return old !== value && (old === old || value === value);
+};
+
+const defaultPropertyDeclaration: PropertyDeclaration = {
+  attribute: true,
+  type: String,
+  reflect: false,
+  shouldInvalidate: notEqual
+};
+
+const microtaskPromise = new Promise((resolve) => resolve(true));
+
+const STATE_HAS_UPDATED = 1;
+const STATE_IS_INVALID = 1 << 2;
+const STATE_IS_REFLECTING = 1 << 3;
+type UpdateState = typeof STATE_HAS_UPDATED | typeof STATE_IS_INVALID | typeof STATE_IS_REFLECTING;
+
+/**
+ * Base element class which manages element properties and attributes. When
+ * properties change, the `update` method is asynchronously called. This method
+ * should be supplied by subclassers to render updates as desired.
+ */
+export abstract class UpdatingElement extends HTMLElement {
+
+  /**
+   * Maps attribute names to properties; for example `foobar` attribute
+   * to `fooBar` property.
+   */
+  private static _attributeToPropertyMap: AttributeMap = new Map();
+
+  /**
+   * Marks class as having finished creating properties.
+   */
+  private static _finalized = true;
+
+  /**
+   * Memoized list of all class properties, including any superclass properties.
+   */
+  private static _classProperties: PropertyDeclarationMap = new Map();
+
+  static properties: PropertyDeclarations = {};
+
+  /**
+   * Returns a list of attributes corresponding to the registered properties.
+   */
+  static get observedAttributes() {
+    // note: piggy backing on this to ensure we're _finalized.
+    this._finalize();
+    const attributes = [];
+    for (const [p, v] of this._classProperties) {
+      const attr = this._attributeNameForProperty(p, v);
+      if (attr !== undefined) {
+        this._attributeToPropertyMap.set(attr, p);
+        attributes.push(attr);
+      }
+    }
+    return attributes;
+  }
+
+  /**
+   * Creates a property accessor on the element prototype if one does not exist.
+   * The property setter calls the property's `shouldInvalidate` property option
+   * or uses a strict identity check to determine if the set should trigger
+   * invalidation and update.
+   */
+  static createProperty(name: PropertyKey, options: PropertyDeclaration = defaultPropertyDeclaration) {
+    // ensure private storage for property declarations.
+    if (!this.hasOwnProperty('_classProperties')) {
+      this._classProperties = new Map();
+      // NOTE: Workaround IE11 not supporting Map constructor argument.
+      const superProperties = Object.getPrototypeOf(this)._classProperties;
+      if (superProperties !== undefined) {
+        superProperties.forEach((v: any, k: PropertyKey) =>
+          this._classProperties.set(k, v));
+      }
+    }
+    this._classProperties.set(name, options);
+    // Allow user defined accessors by not replacing an existing own-property accessor.
+    if (this.prototype.hasOwnProperty(name)) {
+      return;
+    }
+    const key = typeof name === 'symbol' ? Symbol() : `__${name}`;
+    Object.defineProperty(this.prototype, name, {
+      get() {
+        return this[key];
+      },
+      set(value) {
+        const oldValue = this[name];
+        this[key] = value;
+        this.invalidateProperty(name, oldValue, options);
+      },
+      configurable: true,
+      enumerable: true
+    });
+  }
+
+  /**
+   * Creates property accessors for registered properties and ensures
+   * any superclasses are also finalized.
+   */
+  private static _finalize() {
+    if (this.hasOwnProperty('_finalized') && this._finalized) {
+      return;
+    }
+    // finalize any superclasses
+    const superCtor = Object.getPrototypeOf(this);
+    if (typeof superCtor._finalize === 'function') {
+      superCtor._finalize();
+    }
+    this._finalized = true;
+    // initialize map populated in observedAttributes
+    this._attributeToPropertyMap = new Map();
+    // make any properties
+    const props = this.properties;
+    // support symbols in properties (IE11 does not support this)
+    const propKeys = [...Object.getOwnPropertyNames(props),
+        ...(typeof Object.getOwnPropertySymbols === 'function') ? Object.getOwnPropertySymbols(props) : []];
+    for (const p of propKeys) {
+      // note, use of `any` is due to TypeSript lack of support for symbol in index types
+      this.createProperty(p, (props as any)[p]);
+    }
+  }
+
+  /**
+   * Returns the property name for the given attribute `name`.
+   */
+  private static _attributeNameForProperty(name: PropertyKey, options?: PropertyDeclaration) {
+    const attribute = options !== undefined && options.attribute;
+    return attribute === false ? undefined : (typeof attribute === 'string' ?
+        attribute : (typeof name === 'string' ? name.toLowerCase() : undefined));
+  }
+
+  /**
+   * Returns true if a property should cause invalidation and update.
+   * Called when a property value is set and uses the `shouldInvalidate`
+   * option for the property if present or a strict identity check.
+   */
+  private static _valueShouldInvalidate(value: unknown, old: unknown,
+      shouldInvalidate: ShouldInvalidate = notEqual) {
+    return shouldInvalidate(value, old);
+  }
+
+  /**
+   * Returns the property value for the given attribute value.
+   * Called via the `attributeChangedCallback` and uses the property's `type`
+   * or `type.fromAttribute` property option.
+   */
+  private static _propertyValueFromAttribute(value: string, options?: PropertyDeclaration) {
+    const type = options && options.type;
+    if (type === undefined) {
+      return value;
+    }
+    // Note: special case `Boolean` so users can use it as a `type`.
+    const fromAttribute = type === Boolean ? fromBooleanAttribute :
+        (typeof type === 'function' ? type : type.fromAttribute);
+    return fromAttribute ? fromAttribute(value) : value;
+  }
+
+  /**
+   * Returns the attribute value for the given property value. If this
+   * returns undefined, the property will *not* be reflected to an attribute.
+   * If this returns null, the attribute will be removed, otherwise the
+   * attribute will be set to the value.
+   * This uses the property's `reflect` and `type.toAttribute` property options.
+   */
+  private static _propertyValueToAttribute(value: unknown, options?: PropertyDeclaration) {
+    if (options === undefined || options.reflect === undefined) {
+      return;
+    }
+    // Note: special case `Boolean` so users can use it as a `type`.
+    const toAttribute = options.type === Boolean ? toBooleanAttribute :
+        (options.type && (options.type as AttributeSerializer).toAttribute || String);
+    return toAttribute(value);
+  }
+
+  private _updateState: UpdateState = 0;
+  private _instanceProperties: PropertyValues|undefined = undefined;
+  private _updatePromise: Promise<unknown> = microtaskPromise;
+
+  /**
+   * Map with keys for any properties that have changed since the last
+   * update cycle with previous values.
+   */
+  private _changedProperties: PropertyValues = new Map();
+
+  /**
+   * Map with keys of properties that should be reflected when updated.
+   */
+  private _reflectingProperties: Map<PropertyKey, PropertyDeclaration>|undefined = undefined;
+
+  /**
+   * Node or ShadowRoot into which element DOM should be rendered. Defaults
+   * to an open shadowRoot.
+   */
+  protected renderRoot?: Element|DocumentFragment;
+
+  constructor() {
+    super();
+    this.initialize();
+  }
+
+  /**
+   * Performs element initialization. By default this calls `createRenderRoot` to
+   * create the element `renderRoot` node and captures any pre-set values for
+   * registered properties.
+   */
+  protected initialize() {
+    this.renderRoot = this.createRenderRoot();
+    this._saveInstanceProperties();
+  }
+
+  /**
+   * Fixes any properties set on the instance before upgrade time.
+   * Otherwise these would shadow the accessor and break these properties.
+   * The properties are stored in a map which is played back after the constructor
+   * runs.
+   */
+  private _saveInstanceProperties() {
+    for (const [p] of (this.constructor as typeof UpdatingElement)._classProperties) {
+      if (this.hasOwnProperty(p)) {
+        const value = this[p as keyof this];
+        delete this[p as keyof this];
+        if (!this._instanceProperties) {
+          this._instanceProperties = new Map();
+        }
+        this._instanceProperties.set(p, value);
+      }
+    }
+  }
+
+  /**
+   * Applies previously saved instance properties.
+   */
+  private _applyInstanceProperties() {
+    for (const [p, v] of this._instanceProperties!) {
+      (this as any)[p] = v;
+    }
+    this._instanceProperties = undefined;
+  }
+
+  /**
+   * Returns the node into which the element should render and by default
+   * creates and returns an open shadowRoot. Implement to customize where the
+   * element's DOM is rendered. For example, to render into the element's
+   * childNodes, return `this`.
+   * @returns {Element|DocumentFragment} Returns a node into which to render.
+   */
+  protected createRenderRoot(): Element|ShadowRoot {
+    return this.attachShadow({mode : 'open'});
+  }
+
+  /**
+   * Uses ShadyCSS to keep element DOM updated.
+   */
+  connectedCallback() {
+    if ((this._updateState & STATE_HAS_UPDATED) && window.ShadyCSS !== undefined) {
+      window.ShadyCSS.styleElement(this);
+    }
+    this.invalidate();
+  }
+
+  /**
+   * Synchronizes property values when attributes change.
+   */
+  attributeChangedCallback(name: string, old: string, value: string) {
+    if (old !== value) {
+      this._attributeToProperty(name, value);
+    }
+  }
+
+  private _propertyToAttribute(name: PropertyKey, value: unknown,
+      options: PropertyDeclaration = defaultPropertyDeclaration) {
+    const ctor = (this.constructor as typeof UpdatingElement);
+    const attrValue = ctor._propertyValueToAttribute(value, options);
+    if (attrValue !== undefined) {
+      const attr = ctor._attributeNameForProperty(name, options);
+      if (attr !== undefined) {
+        // Track if the property is being reflected to avoid
+        // setting the property again via `attributeChangedCallback`. Note:
+        // 1. this takes advantage of the fact that the callback is synchronous.
+        // 2. will behave incorrectly if multiple attributes are in the reaction
+        // stack at time of calling. However, since we process attributes
+        // in `update` this should not be possible (or an extreme corner case
+        // that we'd like to discover).
+        // mark state reflecting
+        this._updateState = this._updateState | STATE_IS_REFLECTING;
+        if (attrValue === null) {
+          this.removeAttribute(attr);
+        } else {
+          this.setAttribute(attr, attrValue);
+        }
+        // mark state not reflecting
+        this._updateState = this._updateState & ~STATE_IS_REFLECTING;
+      }
+    }
+  }
+
+  private _attributeToProperty(name: string, value: string) {
+    // Use tracking info to avoid deserializing attribute value if it was
+    // just set from a property setter.
+    if (!(this._updateState & STATE_IS_REFLECTING)) {
+      const ctor = (this.constructor as typeof UpdatingElement);
+      const propName = ctor._attributeToPropertyMap.get(name);
+      if (propName !== undefined) {
+        const options = ctor._classProperties.get(propName);
+        this[propName as keyof this] = ctor._propertyValueFromAttribute(value, options);
+      }
+    }
+  }
+
+  /**
+   * Triggers an invalidation and records an old value for the specified
+   * property to be presented in the `changedProperties` argument to `update`.
+   * When manually creating a property setter, this method should be called to
+   * trigger an invalidation that honors any of the property options specified
+   * for the given property.
+   *
+   * @param name {PropertyKey}
+   * @param oldValue {any}
+   */
+  protected invalidateProperty(name: PropertyKey, oldValue: any, options?: PropertyDeclaration) {
+    // if not passed in, take options from class properties.
+    if (options === undefined) {
+      options = (this.constructor as typeof UpdatingElement)._classProperties.get(name) ||
+          defaultPropertyDeclaration;
+    }
+    if ((this.constructor as typeof UpdatingElement)._valueShouldInvalidate(this[name as keyof this],
+        oldValue, options.shouldInvalidate)) {
+      // track old value when changing.
+      if (!this._changedProperties.has(name)) {
+        this._changedProperties.set(name, oldValue);
+      }
+      // add to reflecting properties set
+      if (options.reflect === true) {
+        if (this._reflectingProperties === undefined) {
+          this._reflectingProperties = new Map();
+        }
+        this._reflectingProperties.set(name, options);
+      }
+      this.invalidate();
+    }
+  }
+
+  /**
+   * Invalidates the element causing it to asynchronously update regardless
+   * of whether or not any property changes are pending. This method is
+   * automatically called when any registered property changes.
+   */
+  async invalidate() {
+    if (!this._isInvalid) {
+      // mark state invalid...
+      this._updateState = this._updateState | STATE_IS_INVALID;
+      let resolver: any;
+      const previousValidatePromise = this._updatePromise;
+      this._updatePromise = new Promise((r) => resolver = r);
+      await previousValidatePromise;
+      this._flush();
+      resolver!(!this._isInvalid);
+    }
+    return this._updatePromise;
+  }
+
+  private get _isInvalid() {
+    return (this._updateState & STATE_IS_INVALID);
+  }
+
+  /**
+   * Validates the element by updating it via `update`.
+   */
+  private _flush() {
+    // Mixin instance properties once, if they exist.
+    if (this._instanceProperties) {
+      this._applyInstanceProperties();
+    }
+    if (this.shouldUpdate(this._changedProperties)) {
+      this.update(this._changedProperties);
+    } else {
+      this._markUpdated();
+    }
+  }
+
+  private _markUpdated() {
+    this._changedProperties = new Map();
+    this._updateState = this._updateState & ~STATE_IS_INVALID | STATE_HAS_UPDATED;
+  }
+
+  /**
+   * Returns a Promise that resolves when the element has completed updating
+   * that resolves to a boolean value that is `true` if the element completed
+   * the update without triggering another update. This can happen if a property
+   * is set in `update()` after the call to `super.update()` for example.
+   * This getter can be implemented to await additional state. For example, it
+   * is sometimes useful to await a rendered element before fulfilling this
+   * promise. To do this, first await `super.updateComplete` then any subsequent
+   * state.
+   *
+   * @returns {Promise} The promise returns a boolean that indicates if the
+   * update resolved without triggering another update.
+   */
+  get updateComplete() {
+    return this._updatePromise;
+  }
+
+  /**
+   * Controls whether or not `update` should be called when the element invalidates.
+   * By default, this method always returns true, but this can be customized to
+   * control when to update.
+   * * @param _changedProperties Map of changed properties with old values
+   */
+  protected shouldUpdate(_changedProperties: PropertyValues): boolean {
+    return true;
+  }
+
+  /**
+   * Updates the element. By default this method reflects property values to attributes.
+   * It should be overridden to render and keep updated DOM in the element's root.
+   * Within `update()` setting properties does not trigger `invalidate()`, allowing
+   * property values to be computed and validated before DOM is rendered and updated.
+   * This means in an override of `update()`, before calling `super.update()`
+   * setting properties will not trigger another update, but after calling `super.update()`
+   * setting properties will trigger another update.
+   * * @param _changedProperties Map of changed properties with old values
+   */
+  protected update(_changedProperties: PropertyValues): void {
+    if (this._reflectingProperties !== undefined && this._reflectingProperties.size > 0) {
+      for (const [k, v] of this._reflectingProperties) {
+        this._propertyToAttribute(k, this[k as keyof this], v);
+      }
+      this._reflectingProperties = undefined;
+    }
+    // Before this (before calling super)...
+    this._markUpdated();
+  }
+
+}
\ No newline at end of file
diff --git a/src/lit-element.ts b/src/lit-element.ts
index fbf44fc2..8f5e40b5 100644
--- a/src/lit-element.ts
+++ b/src/lit-element.ts
@@ -11,286 +11,65 @@
  * subject to an additional IP rights grant found at
  * http://polymer.github.io/PATENTS.txt
  */
-import {
-  PropertiesChangedConstructor
-} from '@polymer/polymer/lib/mixins/properties-changed.js';
-import {PropertiesMixin} from '@polymer/polymer/lib/mixins/properties-mixin.js';
-import {
-  PropertiesMixinConstructor
-} from '@polymer/polymer/lib/mixins/properties-mixin.js';
-import {camelToDashCase} from '@polymer/polymer/lib/utils/case-map.js';
-import {render} from 'lit-html/lib/shady-render.js';
-import {TemplateResult} from 'lit-html/lit-html.js';
+import {render} from 'lit-html/lib/shady-render';
+import {TemplateResult} from 'lit-html';
+import {UpdatingElement, PropertyValues} from './lib/updating-element.js';
 
-export {
-  PropertiesChangedConstructor
-} from '@polymer/polymer/lib/mixins/properties-changed.js';
-export {
-  PropertiesMixinConstructor
-} from '@polymer/polymer/lib/mixins/properties-mixin.js';
-export {html, svg} from 'lit-html/lib/lit-extended.js';
+export * from './lib/updating-element.js';
+export {html, svg} from 'lit-html/lit-html';
 
-// This is a hack to get tsc to not complain about unused interfaces and
-// still generate the type declarations properly
-export type __unused = PropertiesChangedConstructor&PropertiesMixinConstructor;
 
-/**
- * Renders attributes to the given element based on the `attrInfo` object where
- * boolean values are added/removed as attributes.
- * @param element Element on which to set attributes.
- * @param attrInfo Object describing attributes.
- */
-export function renderAttributes(
-    element: HTMLElement, attrInfo: {[name: string]: string|boolean|number}) {
-  for (const a in attrInfo) {
-    const v = attrInfo[a] === true ? '' : attrInfo[a];
-    if (v || v === '' || v === 0) {
-      if (element.getAttribute(a) !== v) {
-        element.setAttribute(a, String(v));
-      }
-    } else if (element.hasAttribute(a)) {
-      element.removeAttribute(a);
-    }
-  }
-}
-
-/**
- * Returns a string of css class names formed by taking the properties
- * in the `classInfo` object and appending the property name to the string of
- * class names if the property value is truthy.
- * @param classInfo
- */
-export function classString(
-    classInfo: {[name: string]: string|boolean|number}) {
-  const o = [];
-  for (const name in classInfo) {
-    const v = classInfo[name];
-    if (v) {
-      o.push(name);
-    }
-  }
-  return o.join(' ');
-}
-
-/**
- * Returns a css style string formed by taking the properties in the `styleInfo`
- * object and appending the property name (dash-cased) colon the
- * property value. Properties are separated by a semi-colon.
- * @param styleInfo
- */
-export function styleString(
-    styleInfo: {[name: string]: string|boolean|number}) {
-  const o = [];
-  for (const name in styleInfo) {
-    const v = styleInfo[name];
-    if (v || v === 0) {
-      o.push(`${camelToDashCase(name)}: ${v}`);
-    }
-  }
-  return o.join('; ');
-}
-
-export class LitElement extends PropertiesMixin
-(HTMLElement) {
-
-  private __renderComplete: Promise<boolean>|null = null;
-  private __resolveRenderComplete: Function|null = null;
-  private __isInvalid: Boolean = false;
-  private __isChanging: Boolean = false;
-  private _root?: Element|DocumentFragment;
-
-  /**
-   * Override which sets up element rendering by calling* `_createRoot`
-   * and `_firstRendered`.
-   */
-  ready() {
-    this._root = this._createRoot();
-    super.ready();
-    this._firstRendered();
-  }
-
-  connectedCallback() {
-    if (window.ShadyCSS && this._root) {
-      window.ShadyCSS.styleElement(this);
-    }
-    super.connectedCallback();
-  }
-
-  /**
-   * Called after the element DOM is rendered for the first time.
-   * Implement to perform tasks after first rendering like capturing a
-   * reference to a static node which must be directly manipulated.
-   * This should not be commonly needed. For tasks which should be performed
-   * before first render, use the element constructor.
-   */
-  _firstRendered() {}
-
-  /**
-   * Implement to customize where the element's template is rendered by
-   * returning an element into which to render. By default this creates
-   * a shadowRoot for the element. To render into the element's childNodes,
-   * return `this`.
-   * @returns {Element|DocumentFragment} Returns a node into which to render.
-   */
-  protected _createRoot(): Element|DocumentFragment {
-    return this.attachShadow({mode : 'open'});
-  }
+export abstract class LitElement extends UpdatingElement {
 
+  private _firstRendered = false;
   /**
-   * Override which returns the value of `_shouldRender` which users
-   * should implement to control rendering. If this method returns false,
-   * _propertiesChanged will not be called and no rendering will occur even
-   * if property values change or `requestRender` is called.
-   * @param _props Current element properties
-   * @param _changedProps Changing element properties
-   * @param _prevProps Previous element properties
-   * @returns {boolean} Default implementation always returns true.
+   * Render method used to render the lit-html TemplateResult to the element's DOM.
+   * @param {TemplateResult} Template to render.
+   * @param {Element|DocumentFragment} Node into which to render.
+   * @param {String} Element name.
    */
-  _shouldPropertiesChange(_props: object, _changedProps: object,
-                          _prevProps: object): boolean {
-    const shouldRender = this._shouldRender(_props, _changedProps, _prevProps);
-    if (!shouldRender && this.__resolveRenderComplete) {
-      this.__resolveRenderComplete(false);
-    }
-    return shouldRender;
-  }
+  static render = render;
 
   /**
-   * Implement to control if rendering should occur when property values
-   * change or `requestRender` is called. By default, this method always
-   * returns true, but this can be customized as an optimization to avoid
-   * rendering work when changes occur which should not be rendered.
-   * @param _props Current element properties
-   * @param _changedProps Changing element properties
-   * @param _prevProps Previous element properties
-   * @returns {boolean} Default implementation always returns true.
+   * Updates the element. This method reflects property values to attributes
+   * and calls `render` to render DOM via lit-html. It should be overridden to
+   * perform tasks on rendered DOM. Within `update()` setting properties does
+   * not trigger `invalidate()`, allowing property values to be computed and
+   * validated before DOM is rendered and updated. This means in an override
+   * of `update()`, before calling `super.update()` setting properties will not
+   * trigger another update, but after calling `super.update()` setting
+   * properties will trigger another update.
+   * * @param changedProperties Map of changed properties with old values
    */
-  protected _shouldRender(_props: object, _changedProps: object,
-                          _prevProps: object): boolean {
-    return true;
-  }
-
-  /**
-   * Override which performs element rendering by calling
-   * `_render`, `_applyRender`, and finally `_didRender`.
-   * @param props Current element properties
-   * @param changedProps Changing element properties
-   * @param prevProps Previous element properties
-   */
-  _propertiesChanged(props: object, changedProps: object, prevProps: object) {
-    super._propertiesChanged(props, changedProps, prevProps);
-    const result = this._render(props);
-    if (result && this._root !== undefined) {
-      this._applyRender(result, this._root!);
+  protected update(changedProperties: PropertyValues) {
+    super.update(changedProperties);
+    if (typeof this.render === 'function') {
+      (this.constructor as typeof LitElement).render(this.render(), this.renderRoot!, this.localName!);
+    } else {
+      throw new Error('render() not implemented');
     }
-    this._didRender(props, changedProps, prevProps);
-    if (this.__resolveRenderComplete) {
-      this.__resolveRenderComplete(true);
-    }
-  }
-
-  _flushProperties() {
-    this.__isChanging = true;
-    this.__isInvalid = false;
-    super._flushProperties();
-    this.__isChanging = false;
-  }
-
-  /**
-   * Override which warns when a user attempts to change a property during
-   * the rendering lifecycle. This is an anti-pattern and should be avoided.
-   * @param property {string}
-   * @param value {any}
-   * @param old {any}
-   */
-  // tslint:disable-next-line no-any
-  _shouldPropertyChange(property: string, value: any, old: any) {
-    const change = super._shouldPropertyChange(property, value, old);
-    if (change && this.__isChanging) {
-      console.warn(
-          `Setting properties in response to other properties changing ` +
-          `considered harmful. Setting '${property}' from ` +
-          `'${this._getProperty(property)}' to '${value}'.`);
+    if (!this._firstRendered) {
+      this._firstRendered = true;
+      if (typeof this.firstRendered === 'function') {
+        this.firstRendered();
+      }
     }
-    return change;
   }
 
   /**
-   * Implement to describe the DOM which should be rendered in the element.
-   * Ideally, the implementation is a pure function using only props to describe
-   * the element template. The implementation must return a `lit-html`
-   * TemplateResult. By default this template is rendered into the element's
-   * shadowRoot. This can be customized by implementing `_createRoot`. This
-   * method must be implemented.
-   * @param {*} _props Current element properties
+   Invoked on each update to perform rendering tasks. This method must return a
+   lit-html TemplateResult. Setting properties in `render()` will not trigger
+   the element to update.
    * @returns {TemplateResult} Must return a lit-html TemplateResult.
    */
-  protected _render(_props: object): TemplateResult {
-    throw new Error('_render() not implemented');
-  }
+  protected abstract render(): TemplateResult;
 
   /**
-   * Renders the given lit-html template `result` into the given `node`.
-   * Implement to customize the way rendering is applied. This is should not
-   * typically be needed and is provided for advanced use cases.
-   * @param result {TemplateResult} `lit-html` template result to render
-   * @param node {Element|DocumentFragment} node into which to render
-   */
-  protected _applyRender(result: TemplateResult,
-                         node: Element|DocumentFragment) {
-    render(result, node, this.localName!);
-  }
-
-  /**
-   * Called after element DOM has been rendered. Implement to
-   * directly control rendered DOM. Typically this is not needed as `lit-html`
-   * can be used in the `_render` method to set properties, attributes, and
-   * event listeners. However, it is sometimes useful for calling methods on
-   * rendered elements, like calling `focus()` on an element to focus it.
-   * @param _props Current element properties
-   * @param _changedProps Changing element properties
-   * @param _prevProps Previous element properties
-   */
-  protected _didRender(_props: object, _changedProps: object,
-                       _prevProps: object) {}
-
-  /**
-   * Call to request the element to asynchronously re-render regardless
-   * of whether or not any property changes are pending.
-   */
-  requestRender() { this._invalidateProperties(); }
-
-  /**
-   * Override which provides tracking of invalidated state.
+   Invoked when the element's DOM is first rendered. Override to perform
+   post rendering tasks via DOM APIs. For example, focusing a rendered element.
+   Setting properties in `firstRendered()` will trigger the element to update.
+   * @returns {TemplateResult} Must return a lit-html TemplateResult.
    */
-  _invalidateProperties() {
-    this.__isInvalid = true;
-    super._invalidateProperties();
-  }
+  protected firstRendered?(): void;
 
-  /**
-   * Returns a promise which resolves after the element next renders.
-   * The promise resolves to `true` if the element rendered and `false` if the
-   * element did not render.
-   * This is useful when users (e.g. tests) need to react to the rendered state
-   * of the element after a change is made.
-   * This can also be useful in event handlers if it is desireable to wait
-   * to send an event until after rendering. If possible implement the
-   * `_didRender` method to directly respond to rendering within the
-   * rendering lifecycle.
-   */
-  get renderComplete() {
-    if (!this.__renderComplete) {
-      this.__renderComplete = new Promise((resolve) => {
-        this.__resolveRenderComplete = (value: boolean) => {
-          this.__resolveRenderComplete = this.__renderComplete = null;
-          resolve(value);
-        };
-      });
-      if (!this.__isInvalid && this.__resolveRenderComplete) {
-        Promise.resolve().then(() => this.__resolveRenderComplete!(false));
-      }
-    }
-    return this.__renderComplete;
-  }
 }
diff --git a/src/test/lit-element_styling_test.ts b/src/test/lit-element_styling_test.ts
index bcc0bb46..a6058fdb 100644
--- a/src/test/lit-element_styling_test.ts
+++ b/src/test/lit-element_styling_test.ts
@@ -18,6 +18,8 @@ import {
   LitElement,
 } from '../lit-element.js';
 
+import {generateElementName, nextFrame, getComputedStyleValue} from './test-helpers.js';
+
 declare global {
   interface Window {
     ShadyDOM: any; // tslint:disable-line
@@ -40,9 +42,10 @@ suite('Styling', () => {
     }
   });
 
-  test('content shadowRoot is styled', () => {
-    customElements.define('s-1', class extends LitElement {
-      _render() { return html`
+  test('content shadowRoot is styled', async () => {
+    const name = generateElementName();
+    customElements.define(name, class extends LitElement {
+      render() { return html`
         <style>
           div {
             border: 2px solid blue;
@@ -51,20 +54,22 @@ suite('Styling', () => {
         <div>Testing...</div>`;
       }
     });
-    const el = document.createElement('s-1');
+    const el = document.createElement(name);
     container.appendChild(el);
+    await (el as LitElement).updateComplete;
     const div = el.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '2px');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '2px');
   });
 
-  test('shared styling rendered into shadowRoot is styled', () => {
+  test('shared styling rendered into shadowRoot is styled', async () => {
     const style = html`<style>
       div {
         border: 4px solid blue;
       }
     </style>`;
-    customElements.define('s-2', class extends LitElement {
-      _render() { return html`
+    const name = generateElementName();
+    customElements.define(name, class extends LitElement {
+      render() { return html`
         <style>
           div {
             border: 2px solid blue;
@@ -74,15 +79,17 @@ suite('Styling', () => {
         <div>Testing...</div>`;
       }
     });
-    const el = document.createElement('s-2');
+    const el = document.createElement(name);
     container.appendChild(el);
+    await (el as LitElement).updateComplete;
     const div = el.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '4px');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '4px');
   });
 
-  test('custom properties render', () => {
-    customElements.define('s-3', class extends LitElement {
-      _render() { return html`
+  test('custom properties render', async () => {
+    const name = generateElementName();
+    customElements.define(name, class extends LitElement {
+      render() { return html`
         <style>
           :host {
             --border: 8px solid red;
@@ -94,15 +101,16 @@ suite('Styling', () => {
         <div>Testing...</div>`;
       }
     });
-    const el = document.createElement('s-3');
+    const el = document.createElement(name);
     container.appendChild(el);
+    await (el as LitElement).updateComplete;
     const div = el.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '8px');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '8px');
   });
 
-  test('custom properties flow to nested elements', () => {
-    customElements.define('s-4-inner', class extends LitElement {
-      _render() { return html`
+  test('custom properties flow to nested elements', async () => {
+    customElements.define('x-inner', class extends LitElement {
+      render() { return html`
         <style>
           div {
             border: var(--border);
@@ -111,25 +119,38 @@ suite('Styling', () => {
         <div>Testing...</div>`;
       }
     });
-    customElements.define('s-4', class extends LitElement {
-      _render() { return html`
+    const name = generateElementName();
+    class E extends LitElement {
+      inner: LitElement|null = null;
+
+      render() { return html`
         <style>
-          s-4-inner {
+          x-inner {
             --border: 8px solid red;
           }
         </style>
-        <s-4-inner></s-4-inner>`;
+        <x-inner></x-inner>`;
       }
-    });
-    const el = document.createElement('s-4');
+
+      firstRendered() {
+        this.inner = this.shadowRoot!.querySelector('x-inner')! as LitElement;
+      }
+    }
+    customElements.define(name, E);
+    const el = document.createElement(name) as E;
     container.appendChild(el);
-    const div = el.shadowRoot!.querySelector('s-4-inner')!.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '8px');
+
+    // Workaround for Safari 9 Promise timing bugs.
+    await el.updateComplete && await el.inner!.updateComplete;
+
+    await nextFrame();
+    const div = el.inner!.shadowRoot!.querySelector('div');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '8px');
   });
 
-  test('elements with custom properties can move between elements', (done) => {
-    customElements.define('s-5-inner', class extends LitElement {
-      _render() { return html`
+  test('elements with custom properties can move between elements', async () => {
+    customElements.define('x-inner1', class extends LitElement {
+      render() { return html`
         <style>
           div {
             border: var(--border);
@@ -138,42 +159,61 @@ suite('Styling', () => {
         <div>Testing...</div>`;
       }
     });
-    customElements.define('s-5', class extends LitElement {
-      _render() { return html`
+    const name1 = generateElementName();
+    customElements.define(name1, class extends LitElement {
+
+      inner: Element|null = null;
+
+      render() { return html`
         <style>
-          s-5-inner {
+          x-inner1 {
             --border: 2px solid red;
           }
         </style>
-        <s-5-inner></s-5-inner>`;
+        <x-inner1></x-inner1>`;
+      }
+
+      firstRendered() {
+        this.inner = this.shadowRoot!.querySelector('x-inner1');
       }
     });
-    customElements.define('s-6', class extends LitElement {
-      _render() { return html`
+    const name2 = generateElementName();
+    customElements.define(name2, class extends LitElement {
+
+      render() { return html`
         <style>
-          s-5-inner {
+          x-inner1 {
             --border: 8px solid red;
           }
         </style>`;
       }
+
     });
-    const el = document.createElement('s-5');
-    const el2 = document.createElement('s-6');
+    const el = document.createElement(name1) as LitElement;
+    const el2 = document.createElement(name2);
     container.appendChild(el);
     container.appendChild(el2);
-    const inner = el.shadowRoot!.querySelector('s-5-inner');
-    const div = inner!.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '2px');
+    let div: Element|null;
+
+    // Workaround for Safari 9 Promise timing bugs.
+    await el.updateComplete;
+
+    await nextFrame();
+    const inner = el.shadowRoot!.querySelector('x-inner1');
+    div = inner!.shadowRoot!.querySelector('div');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '2px');
     el2!.shadowRoot!.appendChild(inner!);
-    requestAnimationFrame(() => {
-      assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '8px');
-      done();
-    });
+
+    // Workaround for Safari 9 Promise timing bugs.
+    await el.updateComplete;
+
+    await nextFrame();
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '8px');
   });
 
-  test('@apply renders in nested elements', () => {
-    customElements.define('s-7-inner', class extends LitElement {
-      _render() { return html`
+  test('@apply renders in nested elements', async () => {
+    customElements.define('x-inner2', class extends LitElement {
+      render() { return html`
         <style>
           div {
             @apply --bag;
@@ -182,22 +222,34 @@ suite('Styling', () => {
         <div>Testing...</div>`;
       }
     });
-    customElements.define('s-7', class extends LitElement {
-      _render() { return html`
+    const name = generateElementName();
+    class E extends LitElement {
+      inner: LitElement|null = null;
+      render() { return html`
         <style>
-          s-7-inner {
+          x-inner2 {
             --bag: {
               border: 10px solid red;
             }
           }
         </style>
-        <s-7-inner></s-7-inner>`;
+        <x-inner2></x-inner2>`;
       }
-    });
-    const el = document.createElement('s-7');
+
+      firstRendered() {
+        this.inner = this.shadowRoot!.querySelector('x-inner2') as LitElement;
+      }
+    }
+    customElements.define(name, E);
+    const el = document.createElement(name) as E;
     container.appendChild(el);
-    const div = el.shadowRoot!.querySelector('s-7-inner')!.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '10px');
+
+    // Workaround for Safari 9 Promise timing bugs.
+    await el.updateComplete && await el.inner!.updateComplete;
+
+    await nextFrame();
+    const div = el.shadowRoot!.querySelector('x-inner2')!.shadowRoot!.querySelector('div');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '10px');
   });
 
 });
@@ -223,8 +275,9 @@ suite('ShadyDOM', () => {
 
   test('properties in styles render with initial value and cannot be changed', async () => {
     let border = `6px solid blue`;
-    customElements.define('shady-1', class extends LitElement {
-      _render() { return html`
+    const name = generateElementName();
+    customElements.define(name, class extends LitElement {
+      render() { return html`
         <style>
           div {
             border: ${border};
@@ -233,14 +286,15 @@ suite('ShadyDOM', () => {
         <div>Testing...</div>`;
       }
     });
-    const el = document.createElement('shady-1') as LitElement;
+    const el = document.createElement(name) as LitElement;
     container.appendChild(el);
+    await el.updateComplete;
     const div = el.shadowRoot!.querySelector('div');
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '6px');
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '6px');
     border = `4px solid orange`;
-    el.requestRender();
-    await el.renderComplete;
-    assert.equal(getComputedStyle(div!).getPropertyValue('border-top-width').trim(), '6px');
+    el.invalidate();
+    await el.updateComplete;
+    assert.equal(getComputedStyleValue(div!, 'border-top-width').trim(), '6px');
   });
 
 });
diff --git a/src/test/lit-element_test.ts b/src/test/lit-element_test.ts
index 0d8db829..20926ccc 100644
--- a/src/test/lit-element_test.ts
+++ b/src/test/lit-element_test.ts
@@ -12,17 +12,9 @@
  * http://polymer.github.io/PATENTS.txt
  */
 
-import {TemplateResult} from 'lit-html/lit-html.js';
+import {html, LitElement, PropertyDeclarations, PropertyValues, property} from '../lit-element.js';
 
-import {
-  classString,
-  html,
-  LitElement,
-  renderAttributes,
-  styleString,
-} from '../lit-element.js';
-
-import {stripExpressionDelimeters} from './test-helpers.js';
+import {stripExpressionDelimeters, generateElementName} from './test-helpers.js';
 
 const assert = chai.assert;
 
@@ -40,450 +32,1350 @@ suite('LitElement', () => {
     }
   });
 
-  test('renders initial content into shadowRoot', () => {
+  test('renders initial content into shadowRoot', async () => {
     const rendered = `hello world`;
-    customElements.define('x-1', class extends LitElement {
-      _render() { return html`${rendered}`; }
+    const name = generateElementName();
+    customElements.define(name, class extends LitElement {
+      render() { return html`${rendered}`; }
     });
-    const el = document.createElement('x-1');
+    const el = document.createElement(name);
     container.appendChild(el);
-    assert.ok(el.shadowRoot);
+    await new Promise((resolve) => {
+      setTimeout(() => {
+        assert.ok(el.shadowRoot);
+        assert.equal(
+            stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+            rendered);
+        resolve();
+      });
+    });
+  });
+
+  test('invalidate waits until update/rendering', async () => {
+    class E extends LitElement {
+      updated = 0;
+      render() { return html`${++this.updated}`; }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.invalidate();
     assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-        rendered);
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '1');
+    await el.invalidate();
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '2');
+    await el.invalidate();
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '3');
   });
 
-  test('can set render target to light dom', () => {
+  test('updateComplete waits for invalidate but does not trigger invalidation, async', async () => {
+    class E extends LitElement {
+      updated = 0;
+      render() { return html`${++this.updated}`; }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '1');
+    await el.updateComplete;
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '1');
+    el.invalidate();
+    await el.updateComplete;
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '2');
+    await el.updateComplete;
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        '2');
+  });
+
+  test('shouldUpdate controls update/rendering',
+       async () => {
+         class E extends LitElement {
+
+           needsUpdate = true;
+           updated = 0;
+
+           shouldUpdate() { return this.needsUpdate; }
+
+           render() { return html`${++this.updated}`; }
+         }
+         customElements.define(generateElementName(), E);
+         const el = new E();
+         container.appendChild(el);
+         await el.updateComplete;
+         assert.equal(
+             stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+             '1');
+         el.needsUpdate = false;
+         await el.invalidate();
+         assert.equal(
+             stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+             '1');
+         el.needsUpdate = true;
+         await el.invalidate();
+         assert.equal(
+             stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+             '2');
+         await el.invalidate();
+         assert.equal(
+             stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+             '3');
+       });
+
+  test('can set render target to light dom', async () => {
     const rendered = `hello world`;
-    customElements.define('x-1a', class extends LitElement {
-      _render() { return html`${rendered}`; }
+    const name = generateElementName();
+    customElements.define(name, class extends LitElement {
+      render() { return html`${rendered}`; }
 
-      _createRoot() { return this; }
+      createRenderRoot() { return this; }
     });
-    const el = document.createElement('x-1a');
+    const el = document.createElement(name);
     container.appendChild(el);
+    await (el as LitElement).updateComplete;
     assert.notOk(el.shadowRoot);
     assert.equal(stripExpressionDelimeters(el.innerHTML), rendered);
   });
 
-  test('renders when created via constructor', () => {
+  test('renders when created via constructor', async () => {
     const rendered = `hello world`;
     class E extends LitElement {
-      _render() { return html`${rendered}`; }
+      render() { return html`${rendered}`; }
     }
-    customElements.define('x-2', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
+    await el.updateComplete;
     assert.ok(el.shadowRoot);
     assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
         rendered);
   });
 
-  test('renders changes when properties change', (done) => {
+  test('property options', async() => {
+
+    const shouldInvalidate = (value: any, old: any) => old === undefined || value > old;
+    const fromAttribute = (value: any) => parseInt(value);
+    const toAttribute = (value: any) => `${value}-attr`;
+    class E extends LitElement {
+      static get properties() {
+        return {
+          noAttr: {attribute: false},
+          atTr: {attribute: true},
+          customAttr: {attribute: 'custom', reflect: true},
+          shouldInvalidate: {shouldInvalidate},
+          fromAttribute: {type: fromAttribute},
+          toAttribute: {reflect: true, type: {toAttribute}},
+          all: {attribute: 'all-attr', shouldInvalidate, type: {fromAttribute, toAttribute}, reflect: true},
+        };
+      }
+
+      noAttr = 'noAttr';
+      atTr = 'attr';
+      customAttr = 'customAttr';
+      shouldInvalidate = 10;
+      fromAttribute = 1;
+      toAttribute = 1;
+      all = 10;
+
+      updated = 0;
+
+      update(changed: PropertyValues) {
+        this.updated++;
+        super.update(changed);
+      }
+
+      render() { return html``; }
+
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(el.updated, 1);
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.atTr, 'attr');
+    assert.equal(el.customAttr, 'customAttr');
+    assert.equal(el.shouldInvalidate, 10);
+    assert.equal(el.fromAttribute, 1);
+    assert.equal(el.toAttribute, 1);
+    assert.equal(el.getAttribute('toattribute'), '1-attr');
+    assert.equal(el.all, 10);
+    assert.equal(el.getAttribute('all-attr'), '10-attr');
+    el.setAttribute('noattr', 'noAttr2');
+    el.setAttribute('attr', 'attr2');
+    el.setAttribute('custom', 'customAttr2');
+    el.setAttribute('fromattribute', '2attr');
+    el.toAttribute = 2;
+    el.all = 5;
+    await el.updateComplete;
+    assert.equal(el.updated, 2);
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.atTr, 'attr2');
+    assert.equal(el.customAttr, 'customAttr2');
+    assert.equal(el.fromAttribute, 2);
+    assert.equal(el.toAttribute, 2);
+    assert.equal(el.getAttribute('toattribute'), '2-attr');
+    assert.equal(el.all, 5);
+    el.all = 15;
+    await el.updateComplete;
+    assert.equal(el.updated, 3);
+    assert.equal(el.all, 15);
+    assert.equal(el.getAttribute('all-attr'), '15-attr');
+    el.setAttribute('all-attr', '16-attr');
+    await el.updateComplete;
+    assert.equal(el.updated, 4);
+    assert.equal(el.getAttribute('all-attr'), '16-attr');
+    assert.equal(el.all, 16);
+    el.shouldInvalidate = 5;
+    await el.updateComplete;
+    assert.equal(el.shouldInvalidate, 5);
+    assert.equal(el.updated, 4);
+    el.shouldInvalidate = 15;
+    await el.updateComplete;
+    assert.equal(el.shouldInvalidate, 15);
+    assert.equal(el.updated, 5);
+    el.setAttribute('all-attr', '5-attr');
+    await el.updateComplete;
+    assert.equal(el.all, 5);
+    assert.equal(el.updated, 5);
+    el.all = 15;
+    await el.updateComplete;
+    assert.equal(el.all, 15);
+    assert.equal(el.updated, 6);
+  });
+
+  test('property options via decorator', async() => {
+
+    const shouldInvalidate = (value: any, old: any) => old === undefined || value > old;
+    const fromAttribute = (value: any) => parseInt(value);
+    const toAttribute = (value: any) => `${value}-attr`;
+    class E extends LitElement {
+
+      @property({attribute: false})
+      noAttr = 'noAttr';
+      @property({attribute: true})
+      atTr = 'attr';
+      @property({attribute: 'custom', reflect: true})
+      customAttr = 'customAttr';
+      @property({shouldInvalidate})
+      shouldInvalidate = 10;
+      @property({type: fromAttribute})
+      fromAttribute = 1;
+      @property({reflect: true, type: {toAttribute}})
+      toAttribute = 1;
+      @property({attribute: 'all-attr', shouldInvalidate, type: {fromAttribute, toAttribute}, reflect: true})
+      all = 10;
+
+      updated = 0;
+
+      update(changed: PropertyValues) {
+        this.updated++;
+        super.update(changed);
+      }
+
+      render() { return html``; }
+
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(el.updated, 1);
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.atTr, 'attr');
+    assert.equal(el.customAttr, 'customAttr');
+    assert.equal(el.shouldInvalidate, 10);
+    assert.equal(el.fromAttribute, 1);
+    assert.equal(el.toAttribute, 1);
+    assert.equal(el.getAttribute('toattribute'), '1-attr');
+    assert.equal(el.all, 10);
+    assert.equal(el.getAttribute('all-attr'), '10-attr');
+    el.setAttribute('noattr', 'noAttr2');
+    el.setAttribute('attr', 'attr2');
+    el.setAttribute('custom', 'customAttr2');
+    el.setAttribute('fromattribute', '2attr');
+    el.toAttribute = 2;
+    el.all = 5;
+    await el.updateComplete;
+    assert.equal(el.updated, 2);
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.atTr, 'attr2');
+    assert.equal(el.customAttr, 'customAttr2');
+    assert.equal(el.fromAttribute, 2);
+    assert.equal(el.toAttribute, 2);
+    assert.equal(el.getAttribute('toattribute'), '2-attr');
+    assert.equal(el.all, 5);
+    el.all = 15;
+    await el.updateComplete;
+    assert.equal(el.updated, 3);
+    assert.equal(el.all, 15);
+    assert.equal(el.getAttribute('all-attr'), '15-attr');
+    el.setAttribute('all-attr', '16-attr');
+    await el.updateComplete;
+    assert.equal(el.updated, 4);
+    assert.equal(el.getAttribute('all-attr'), '16-attr');
+    assert.equal(el.all, 16);
+    el.shouldInvalidate = 5;
+    await el.updateComplete;
+    assert.equal(el.shouldInvalidate, 5);
+    assert.equal(el.updated, 4);
+    el.shouldInvalidate = 15;
+    await el.updateComplete;
+    assert.equal(el.shouldInvalidate, 15);
+    assert.equal(el.updated, 5);
+    el.setAttribute('all-attr', '5-attr');
+    await el.updateComplete;
+    assert.equal(el.all, 5);
+    assert.equal(el.updated, 5);
+    el.all = 15;
+    await el.updateComplete;
+    assert.equal(el.all, 15);
+    assert.equal(el.updated, 6);
+  });
+
+  test('attributes deserialize from html', async() => {
+
+    const fromAttribute = (value: any) => parseInt(value);
+    const toAttributeOnly = (value: any) => typeof value === 'string' && value.indexOf(`-attr`) > 0 ? value : `${value}-attr`;
+    const toAttribute = (value: any) => `${value}-attr`;
+    class E extends LitElement {
+      static get properties() {
+        return {
+          noAttr: {attribute: false},
+          atTr: {attribute: true},
+          customAttr: {attribute: 'custom', reflect: true},
+          fromAttribute: {type: fromAttribute},
+          toAttribute: {reflect: true, type: {toAttribute: toAttributeOnly}},
+          all: {attribute: 'all-attr', type: {fromAttribute, toAttribute}, reflect: true},
+        };
+      }
+
+      noAttr = 'noAttr';
+      atTr = 'attr';
+      customAttr = 'customAttr';
+      fromAttribute = 1;
+      toAttribute: string|number = 1;
+      all = 10;
+
+      render() { return html``; }
+
+    }
+    const name = generateElementName();
+    customElements.define(name, E);
+    container.innerHTML = `<${name}
+      noattr="1"
+      attr="2"
+      custom="3"
+      fromAttribute="6-attr"
+      toAttribute="7"
+      all-attr="11-attr"></${name}>`;
+    const el = container.firstChild as E;
+    await el.updateComplete;
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.getAttribute('noattr'), '1');
+    assert.equal(el.atTr, '2');
+    assert.equal(el.customAttr, '3');
+    assert.equal(el.getAttribute('custom'), '3');
+    assert.equal(el.fromAttribute, 6);
+    assert.equal(el.toAttribute, '7');
+    assert.equal(el.getAttribute('toattribute'), '7-attr');
+    assert.equal(el.all, 11);
+    assert.equal(el.getAttribute('all-attr'), '11-attr');
+  });
+
+  if (Object.getOwnPropertySymbols) {
+    test('properties defined using symbols', async() => {
+
+      const zug = Symbol();
+
+      class E extends LitElement {
+
+        static get properties() {
+          return {
+            foo: {},
+            [zug]: {}
+          };
+        }
+        updated = 0;
+        foo = 5;
+        [zug] = 6;
+
+        render() {
+          return html``;
+        }
+
+        update(changedProperties: PropertyValues) {
+          this.updated++;
+          super.update(changedProperties);
+        }
+
+      }
+      customElements.define(generateElementName(), E);
+      const el = new E();
+      container.appendChild(el);
+      await el.updateComplete;
+      assert.equal(el.updated, 1);
+      assert.equal(el.foo, 5);
+      assert.equal(el[zug], 6);
+      el.foo = 55;
+      await el.updateComplete;
+      assert.equal(el.updated, 2);
+      assert.equal(el.foo, 55);
+      assert.equal(el[zug], 6);
+      el[zug] = 66;
+      await el.updateComplete;
+      assert.equal(el.updated, 3);
+      assert.equal(el.foo, 55);
+      assert.equal(el[zug], 66);
+    });
+
+    test('properties as symbols can set property options', async() => {
+
+      const zug = Symbol();
+
+      class E extends LitElement {
+
+        static get properties() {
+          return {
+            [zug]: {attribute: 'zug', reflect: true, type: (value: string) => Number(value) + 100}
+          };
+        }
+
+        constructor() {
+          super();
+          (this as any)[zug] = 5;
+        }
+
+        render() {
+          return html``;
+        }
+
+      }
+      customElements.define(generateElementName(), E);
+      const el = new E() as any;
+      container.appendChild(el);
+      await el.updateComplete;
+      assert.equal(el[zug], 5);
+      assert.equal(el.getAttribute('zug'), '5');
+      el[zug] = 6;
+      await el.updateComplete;
+      assert.equal(el[zug], 6);
+      assert.equal(el.getAttribute('zug'), '6');
+      el.setAttribute('zug', '7');
+      await el.updateComplete;
+      assert.equal(el.getAttribute('zug'), '107');
+      assert.equal(el[zug], 107);
+    });
+  }
+
+
+  test('property options compose when subclassing', async() => {
+
+    const shouldInvalidate = (value: any, old: any) => old === undefined || value > old;
+    const fromAttribute = (value: any) => parseInt(value);
+    const toAttribute = (value: any) => `${value}-attr`;
+    class E extends LitElement {
+      static get properties(): PropertyDeclarations {
+        return {
+          noAttr: {attribute: false},
+          atTr: {attribute: true},
+          customAttr: {},
+          shouldInvalidate: {},
+        };
+      }
+
+      noAttr = 'noAttr';
+      atTr = 'attr';
+      customAttr = 'customAttr';
+      shouldInvalidate = 10;
+
+      updated = 0;
+
+      update(changed: PropertyValues) {
+        this.updated++;
+        super.update(changed);
+      }
+
+      render() { return html``; }
+
+    }
+    customElements.define(generateElementName(), E);
+
+    class F extends E {
+      static get properties(): PropertyDeclarations {
+        return {
+          customAttr: {attribute: 'custom', reflect: true},
+          shouldInvalidate: {shouldInvalidate},
+          fromAttribute: {},
+          toAttribute: {},
+        };
+      }
+
+      fromAttribute = 1;
+      toAttribute = 1;
+      all = 10;
+
+    }
+
+    class G extends F {
+      static get properties(): PropertyDeclarations {
+        return {
+          fromAttribute: {type: fromAttribute},
+          toAttribute: {reflect: true, type: {toAttribute}},
+          all: {attribute: 'all-attr', shouldInvalidate, type: {fromAttribute, toAttribute}, reflect: true},
+        };
+      }
+
+    }
+
+    customElements.define(generateElementName(), G);
+
+    const el = new G();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(el.updated, 1);
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.atTr, 'attr');
+    assert.equal(el.customAttr, 'customAttr');
+    assert.equal(el.shouldInvalidate, 10);
+    assert.equal(el.fromAttribute, 1);
+    assert.equal(el.toAttribute, 1);
+    assert.equal(el.getAttribute('toattribute'), '1-attr');
+    assert.equal(el.all, 10);
+    assert.equal(el.getAttribute('all-attr'), '10-attr');
+    el.setAttribute('noattr', 'noAttr2');
+    el.setAttribute('attr', 'attr2');
+    el.setAttribute('custom', 'customAttr2');
+    el.setAttribute('fromattribute', '2attr');
+    el.toAttribute = 2;
+    el.all = 5;
+    await el.updateComplete;
+    assert.equal(el.updated, 2);
+    assert.equal(el.noAttr, 'noAttr');
+    assert.equal(el.atTr, 'attr2');
+    assert.equal(el.customAttr, 'customAttr2');
+    assert.equal(el.fromAttribute, 2);
+    assert.equal(el.toAttribute, 2);
+    assert.equal(el.getAttribute('toattribute'), '2-attr');
+    assert.equal(el.all, 5);
+    el.all = 15;
+    await el.updateComplete;
+    assert.equal(el.updated, 3);
+    assert.equal(el.all, 15);
+    assert.equal(el.getAttribute('all-attr'), '15-attr');
+    el.setAttribute('all-attr', '16-attr');
+    await el.updateComplete;
+    assert.equal(el.updated, 4);
+    assert.equal(el.getAttribute('all-attr'), '16-attr');
+    assert.equal(el.all, 16);
+    el.shouldInvalidate = 5;
+    await el.updateComplete;
+    assert.equal(el.shouldInvalidate, 5);
+    assert.equal(el.updated, 4);
+    el.shouldInvalidate = 15;
+    await el.updateComplete;
+    assert.equal(el.shouldInvalidate, 15);
+    assert.equal(el.updated, 5);
+    el.setAttribute('all-attr', '5-attr');
+    await el.updateComplete;
+    assert.equal(el.all, 5);
+    assert.equal(el.updated, 5);
+    el.all = 15;
+    await el.updateComplete;
+    assert.equal(el.all, 15);
+    assert.equal(el.updated, 6);
+
+  });
+
+  test('superclass properties not affected by subclass', async() => {
+
+    class E extends LitElement {
+      static get properties(): PropertyDeclarations {
+        return {
+          foo: {attribute: 'zug', reflect: true},
+          bar: {reflect: true}
+        };
+      }
+
+      foo = 5;
+      bar = 'bar';
+
+      render() { return html``; }
+
+    }
+    customElements.define(generateElementName(), E);
+
+    class F extends E {
+      static get properties(): PropertyDeclarations {
+        return {
+          foo: {attribute: false},
+          nug: {}
+        };
+      }
+
+      foo = 6;
+      bar = 'subbar';
+      nug = 5;
+
+      render() { return html``; }
+
+    }
+    customElements.define(generateElementName(), F);
+
+    const el = new E();
+    const sub = new F();
+    container.appendChild(el);
+    await el.updateComplete;
+    container.appendChild(sub);
+    await sub.updateComplete;
+
+    assert.equal(el.foo, 5);
+    assert.equal(el.getAttribute('zug'), '5');
+    assert.isFalse(el.hasAttribute('foo'));
+    assert.equal(el.bar, 'bar');
+    assert.equal(el.getAttribute('bar'), 'bar');
+    assert.isUndefined((el as any).nug);
+
+    assert.equal(sub.foo, 6);
+    assert.isFalse(sub.hasAttribute('zug'));
+    assert.isFalse(sub.hasAttribute('foo'));
+    assert.equal(sub.bar, 'subbar');
+    assert.equal(sub.getAttribute('bar'), 'subbar');
+    assert.equal(sub.nug, 5);
+  });
+
+   test('Attributes reflect', async () => {
+    const suffix = '-reflected';
     class E extends LitElement {
-      static get properties() { return {foo : String}; }
+      static get properties() {
+        return {
+          foo: {reflect: true, type: {toAttribute: (value: any) => `${value}${suffix}`}}
+        };
+      }
+
+      foo = 0;
+
+      render() { return html``; }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(el.getAttribute('foo'), `0${suffix}`);
+    el.foo = 5;
+    await el.updateComplete;
+    assert.equal(el.getAttribute('foo'), `5${suffix}`);
+  });
+
+  test('Attributes reflect with type: Boolean', async () => {
+    class E extends LitElement {
+      static get properties() {
+        return {
+          bar: {type: Boolean, reflect: true}
+        };
+      }
+
+      bar = true;
+
+      render() { return html``; }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(el.getAttribute('bar'), '');
+    el.bar = false;
+    await el.updateComplete;
+    assert.equal(el.hasAttribute('bar'), false);
+    el.bar = true;
+    await el.updateComplete;
+    assert.equal(el.getAttribute('bar'), '');
+  });
+
+  test('updates/renders when properties change', async () => {
+    class E extends LitElement {
+      static get properties() { return { foo: {}}; }
 
       foo = 'one';
 
-      _render(props: {foo: string}) { return html`${props.foo}`; }
+      render() { return html`${this.foo}`; }
     }
-    customElements.define('x-3', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
     assert.ok(el.shadowRoot);
+    await el.updateComplete;
     assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
         'one');
     el.foo = 'changed';
-    requestAnimationFrame(() => {
-      assert.equal(
-          stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-          'changed');
-      done();
-    });
+    await el.updateComplete;
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        'changed');
   });
 
-  test('renders changes when attributes change', (done) => {
+  test('updates/renders when properties and attributes change', async() => {
     class E extends LitElement {
-      static get properties() { return {foo : String}; }
+      static get properties() {
+        return {
+          value: {},
+          attrValue: {}
+        };
+      }
+
+      value = '1';
+      attrValue = 'attr';
+
+      updatedValue = '';
+      updatedAttrValue = '';
+
+      render() { return html``; }
+
+      update(props: PropertyValues) {
+        super.update(props);
+        this.updatedValue = this.value;
+        this.updatedAttrValue = this.attrValue;
+      }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    assert.ok(el.shadowRoot);
+    await el.updateComplete;
+    assert.equal(el.updatedValue, '1');
+    assert.equal(el.updatedAttrValue, 'attr');
+    el.value = '2';
+    await el.updateComplete;
+    assert.equal(el.updatedValue, '2');
+    assert.equal(el.updatedAttrValue, 'attr');
+    el.attrValue = 'attr2';
+    await el.updateComplete;
+    assert.equal(el.updatedValue, '2');
+    assert.equal(el.updatedAttrValue, 'attr2');
+    el.setAttribute('attrvalue', 'attr3');
+    await el.updateComplete;
+    assert.equal(el.updatedValue, '2');
+    assert.equal(el.updatedAttrValue, 'attr3');
+    el.value = '3';
+    el.setAttribute('attrvalue', 'attr4');
+    await el.updateComplete;
+    assert.equal(el.updatedValue, '3');
+    assert.equal(el.updatedAttrValue, 'attr4');
+  });
+
+  test('updates/renders changes when attributes change', async () => {
+    class E extends LitElement {
+      static get properties() {
+        return {foo: {}};
+      }
 
       foo = 'one';
 
-      _render(props: {foo: string}) { return html`${props.foo}`; }
+      render() { return html`${this.foo}`; }
     }
-    customElements.define('x-4', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
+    await el.updateComplete;
     assert.ok(el.shadowRoot);
     assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
         'one');
     el.setAttribute('foo', 'changed');
-    requestAnimationFrame(() => {
-      assert.equal(
-          stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-          'changed');
-      done();
-    });
+    await el.updateComplete;
+    assert.equal(
+        stripExpressionDelimeters(el.shadowRoot!.innerHTML),
+        'changed');
   });
 
-  test('_firstRendered call after first render and not subsequent renders',
-       async () => {
-         class E extends LitElement {
-           static get properties() { return {foo : String}; }
-
-           foo = 'one';
-           firstRenderedCount = 0;
-           domAtFirstRendered = '';
-
-           _firstRendered() {
-             this.firstRenderedCount++;
-             this.domAtFirstRendered =
-                 stripExpressionDelimeters(this.shadowRoot!.innerHTML);
-           }
-
-           _render(props: {foo: string}) { return html`${props.foo}`; }
-         }
-         customElements.define('x-5', E);
-         const el = new E();
-         container.appendChild(el);
-         assert.equal(el.firstRenderedCount, 1);
-         assert.ok(el.shadowRoot);
-         assert.equal(
-             stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-             el.domAtFirstRendered);
-         assert.equal(el.foo, el.domAtFirstRendered);
-         el.foo = 'two';
-         await el.renderComplete;
-         assert.equal(el.firstRenderedCount, 1);
-         assert.equal(
-             stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-             el.foo);
-         assert.notEqual(el.foo, el.domAtFirstRendered);
-       });
-
-  test('User defined accessor can trigger rendering', async () => {
+  test('User defined accessor can trigger update/render', async () => {
     class E extends LitElement {
       __bar?: number;
 
-      static get properties() { return {foo : Number, bar : Number}; }
+      static get properties() { return {foo: {}, bar: {}}; }
 
       info: string[] = [];
       foo = 0;
 
-      get bar() { return this._getProperty('bar'); }
+      get bar() { return this.__bar; }
 
       set bar(value) {
-        this.__bar = value;
-        this._setProperty('bar', value);
+        this.__bar = Number(value);
+        this.invalidate();
       }
 
-      _render(props: {foo: string, bar: number}) {
+      render() {
         this.info.push('render');
-        return html`${props.foo}${props.bar}`;
+        return html`${this.foo}${this.bar}`;
       }
     }
-    customElements.define('x-6', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
     el.setAttribute('bar', '20');
-    await el.renderComplete;
+    await el.updateComplete;
     assert.equal(el.bar, 20);
     assert.equal(el.__bar, 20);
     assert.equal(stripExpressionDelimeters(el.shadowRoot!.innerHTML), '020');
   });
 
-  test('render attributes, properties, and event listeners via lit-html',
-       function() {
-         class E extends LitElement {
-           _event?: Event;
-
-           _render() {
-             const attr = 'attr';
-             const prop = 'prop';
-             const event = (e: Event) => { this._event = e; };
-             return html
-             `<div attr$="${attr}" prop="${prop}" on-zug="${event}"></div>`;
-           }
-         }
-         customElements.define('x-7', E);
-         const el = new E();
-         container.appendChild(el);
-         const d = el.shadowRoot!.querySelector('div')! as (HTMLDivElement &
-                                                            {prop: string});
-         assert.equal(d.getAttribute('attr'), 'attr');
-         assert.equal(d.prop, 'prop');
-         const e = new Event('zug');
-         d.dispatchEvent(e);
-         assert.equal(el._event, e);
-       });
-
-  test('renderComplete waits until next rendering', async () => {
+  test('User defined accessor can use property options via `invalidateProperty`', async () => {
+    const fromAttribute = (value: any) => parseInt(value);
+    const toAttribute = (value: any) => `${value}-attr`;
+    const shouldInvalidate = (value: any, old: any) => isNaN(old) || value > old;
     class E extends LitElement {
-      static get properties() { return {foo : Number}; }
 
-      foo = 0;
+      updated = 0;
+      __bar: any;
 
-      _render(props: {foo: string}) { return html`${props.foo}`; }
-    }
-    customElements.define('x-8', E);
-    const el = new E();
-    container.appendChild(el);
-    el.foo++;
-    await el.renderComplete;
-    assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-        '1');
-    el.foo++;
-    await el.renderComplete;
-    assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-        '2');
-    el.foo++;
-    await el.renderComplete;
-    assert.equal(
-        stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-        '3');
-  });
+      static get properties() {
+        return {
+          bar: {attribute: 'attr-bar', reflect: true, type: {fromAttribute, toAttribute}, shouldInvalidate}
+        };
+      }
 
-  test('_shouldRender controls rendering', async () => {
-    class E extends LitElement {
-      static get properties() { return {foo : Number}; }
+      constructor() {
+        super();
+        this.bar = 5;
+      }
 
-      foo = 0;
-      renderCount = 0;
-      allowRender = true;
+      update(changed: PropertyValues) {
+        super.update(changed);
+        this.updated++;
+      }
 
-      _render() {
-        this.renderCount++;
-        return html`hi`;
+      get bar() { return this.__bar; }
+
+      set bar(value) {
+        const old = this.bar;
+        this.__bar = Number(value);
+        this.invalidateProperty('bar', old);
       }
 
-      _shouldRender() { return this.allowRender; }
+      render() { return html``; }
+
     }
-    customElements.define('x-9', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
-    assert.equal(el.renderCount, 1);
-    el.foo++;
-    await el.renderComplete;
-    assert.equal(el.renderCount, 2);
-    el.allowRender = false;
-    el.foo++;
-    await el.renderComplete;
-    assert.equal(el.renderCount, 2);
-    el.allowRender = true;
-    el.foo++;
-    await el.renderComplete;
-    assert.equal(el.renderCount, 3);
+    await el.updateComplete;
+    assert.equal(el.updated, 1);
+    assert.equal(el.bar, 5);
+    assert.equal(el.getAttribute('attr-bar'), `5-attr`);
+    el.setAttribute('attr-bar', '7');
+    await el.updateComplete;
+    assert.equal(el.updated, 2);
+    assert.equal(el.bar, 7);
+    assert.equal(el.getAttribute('attr-bar'), `7-attr`);
+    el.bar = 4;
+    await el.updateComplete;
+    assert.equal(el.updated, 2);
+    assert.equal(el.bar, 4);
+    assert.equal(el.getAttribute('attr-bar'), `7-attr`);
+    el.setAttribute('attr-bar', '3');
+    await el.updateComplete;
+    assert.equal(el.updated, 2);
+    assert.equal(el.bar, 3);
+    assert.equal(el.getAttribute('attr-bar'), `3`);
   });
 
-  test('renderComplete returns true if rendering happened and false otherwise',
-       async () => {
-         class E extends LitElement {
+  test('updates/renders attributes, properties, and event listeners via lit-html',
+    async () => {
+      class E extends LitElement {
+        _event?: Event;
+
+        render() {
+          const attr = 'attr';
+          const prop = 'prop';
+          const event = (e: Event) => { this._event = e; };
+          return html
+          `<div attr="${attr}" .prop="${prop}" @zug="${event}"></div>`;
+        }
+      }
+      customElements.define(generateElementName(), E);
+      const el = new E();
+      container.appendChild(el);
+      await el.updateComplete;
+      const d = el.shadowRoot!.querySelector('div')! as (HTMLDivElement &
+                                                        {prop: string});
+      assert.equal(d.getAttribute('attr'), 'attr');
+      assert.equal(d.prop, 'prop');
+      const e = new Event('zug');
+      d.dispatchEvent(e);
+      assert.equal(el._event, e);
+    });
 
-           needsRender = true;
+  test(
+      'firstRendered called when element first renders', async () => {
+        class E extends LitElement {
 
-           static get properties() { return {foo : Number}; }
+          wasUpdated = 0;
+          wasFirstRendered = 0;
 
-           _shouldRender() { return this.needsRender; }
+          update(changedProperties: PropertyValues) {
+            this.wasUpdated++;
+            super.update(changedProperties);
+          }
 
-           foo = 0;
+          render() { return html``; }
 
-           _render(props: {foo: string}) { return html`${props.foo}`; }
-         }
-         customElements.define('x-9.1', E);
-         const el = new E();
-         container.appendChild(el);
-         el.foo++;
-         let rendered;
-         rendered = await el.renderComplete;
-         assert.equal(rendered, true);
-         assert.equal(
-             stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-             '1');
-         el.needsRender = false;
-         el.foo++;
-         rendered = await el.renderComplete;
-         assert.equal(rendered, false);
-         assert.equal(
-             stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-             '1');
-         el.needsRender = true;
-         el.foo++;
-         rendered = await el.renderComplete;
-         assert.equal(rendered, true);
-         assert.equal(
-             stripExpressionDelimeters((el.shadowRoot as ShadowRoot).innerHTML),
-             '3');
-         el.requestRender();
-         rendered = await el.renderComplete;
-         assert.equal(rendered, true);
-         rendered = await el.renderComplete;
-         assert.equal(rendered, false);
-       });
+          firstRendered() {
+            this.wasFirstRendered++;
+          }
+
+        }
+        customElements.define(generateElementName(), E);
+        const el = new E();
+        container.appendChild(el);
+        await el.updateComplete;
+        assert.equal(el.wasUpdated, 1);
+        assert.equal(el.wasFirstRendered, 1);
+        await el.invalidate();
+        assert.equal(el.wasUpdated, 2);
+        assert.equal(el.wasFirstRendered, 1);
+        await el.invalidate();
+        assert.equal(el.wasUpdated, 3);
+        assert.equal(el.wasFirstRendered, 1);
+      });
 
   test(
-      'render lifecycle order: _shouldRender, _render, _applyRender, _didRender',
-      async () => {
+      'render lifecycle order: shouldUpdate, update, render, firstRendered, after update, updateComplete', async () => {
         class E extends LitElement {
-          static get properties() { return {foo : Number}; }
+          static get properties() { return {
+            foo: {type: Number}
+          }; }
 
           info: Array<string> = [];
 
-          _shouldRender() {
-            this.info.push('_shouldRender');
+          shouldUpdate() {
+            this.info.push('shouldUpdate');
             return true;
           }
 
-          _render() {
-            this.info.push('_render');
+          render() {
+            this.info.push('render');
             return html`hi`;
           }
 
-          _applyRender(result: TemplateResult, root: Element|DocumentFragment) {
-            this.info.push('_applyRender');
-            super._applyRender(result, root);
+          update(props: PropertyValues) {
+            this.info.push('before-update');
+            super.update(props);
+            this.info.push('after-update');
+          }
+
+          firstRendered() {
+            this.info.push('firstRendered');
           }
 
-          _didRender() { this.info.push('_didRender'); }
         }
-        customElements.define('x-10', E);
+        customElements.define(generateElementName(), E);
         const el = new E();
         container.appendChild(el);
-        await el.renderComplete;
+        await el.updateComplete;
+        el.info.push('updateComplete');
         assert.deepEqual(
             el.info,
-            [ '_shouldRender', '_render', '_applyRender', '_didRender' ]);
+            [ 'shouldUpdate', 'before-update', 'render', 'firstRendered', 'after-update', 'updateComplete' ]);
       });
 
-  test('renderAttributes renders attributes on element', async () => {
+  test('setting properties in update does not trigger invalidation', async () => {
     class E extends LitElement {
-      static get properties() { return {foo : Number, bar : Boolean}; }
 
+      static get properties() {
+        return {
+          foo: {}
+        };
+      }
+      promiseFulfilled = false;
       foo = 0;
-      bar = true;
+      updated = 0;
+
+      update(props: PropertyValues) {
+        this.updated++;
+        this.foo++;
+        super.update(props);
+      }
 
-      _render({foo, bar}: {foo: number, bar: boolean}) {
-        renderAttributes(this, {foo, bar});
-        return html`${foo}${bar}`;
+      render() {
+        return html`${this.foo}`;
       }
+
     }
-    customElements.define('x-11', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
-    assert.equal(el.getAttribute('foo'), '0');
-    assert.equal(el.getAttribute('bar'), '');
+    await el.updateComplete;
+    assert.equal(el.foo, 1);
+    assert.equal(el.updated, 1);
+    assert.equal(el.shadowRoot!.textContent, '1');
     el.foo = 5;
-    el.bar = false;
-    await el.renderComplete;
-    assert.equal(el.getAttribute('foo'), '5');
-    assert.equal(el.hasAttribute('bar'), false);
+    await el.updateComplete;
+    assert.equal(el.foo, 6);
+    assert.equal(el.updated, 2);
+    assert.equal(el.shadowRoot!.textContent, '6');
   });
 
-  test('classString updates classes', async () => {
+  test('setting properties in update reflects to attribute and is included in `changedProperties`', async () => {
     class E extends LitElement {
+
       static get properties() {
-        return {foo : Number, bar : Boolean, baz : Boolean};
+        return {
+          foo: {},
+          bar: {},
+          zot: {reflect: true}
+        };
+      }
+
+      changedProperties: PropertyValues|undefined = undefined;
+
+      update(changedProperties: PropertyValues) {
+        (this as any).zot = (this as any).foo + (this as any).bar;
+        super.update(changedProperties);
+        this.changedProperties = changedProperties;
+      }
+
+      render() {
+        return html``;
       }
 
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E() as any;
+    container.appendChild(el);
+    await el.updateComplete;
+    const testMap = new Map();
+    testMap.set('zot', undefined);
+    assert.deepEqual(el.changedProperties, testMap);
+    assert.isNaN(el.zot);
+    assert.equal(el.getAttribute('zot'), 'NaN');
+    el.bar = 1;
+    el.foo = 1;
+    await el.updateComplete;
+    assert.equal(el.foo, 1);
+    assert.equal(el.bar, 1);
+    assert.equal(el.zot, 2);
+    testMap.clear();
+    testMap.set('foo', undefined);
+    testMap.set('bar', undefined);
+    testMap.set('zot', NaN);
+    assert.deepEqual(el.changedProperties, testMap);
+    assert.equal(el.getAttribute('zot'), '2');
+    el.bar = 2;
+    await el.updateComplete;
+    assert.equal(el.bar, 2);
+    assert.equal(el.zot, 3);
+    testMap.clear();
+    testMap.set('bar', 1);
+    testMap.set('zot', 2);
+    assert.deepEqual(el.changedProperties, testMap);
+    assert.equal(el.getAttribute('zot'), '3');
+  });
+
+  test('setting properties after `super.update` does trigger invalidation and does not block updateComplete', async () => {
+    class E extends LitElement {
+
+      static get properties() {
+        return {
+          foo: {}
+        };
+      }
       foo = 0;
-      bar = true;
-      baz = false;
+      updated = 0;
+      fooMax = 2;
 
-      _render({foo, bar, baz}: {foo: number, bar: boolean, baz: boolean}) {
-        return html
-        `<div class$="${classString({foo, bar, zonk : baz})}"></div>`;
+      update(changed: PropertyValues) {
+        this.updated++;
+        super.update(changed);
+        if (this.foo < this.fooMax) {
+          this.foo++;
+        }
       }
+
+      render() {
+        return html``;
+      }
+
     }
-    customElements.define('x-12', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
-    const d = el.shadowRoot!.querySelector('div')!;
-    assert.include(d.className, 'bar');
-    el.foo = 1;
-    el.baz = true;
-    await el.renderComplete;
-    assert.include(d.className, 'foo bar zonk');
-    el.bar = false;
-    await el.renderComplete;
-    assert.include(d.className, 'foo zonk');
-    el.foo = 0;
-    el.baz = false;
-    await el.renderComplete;
-    assert.notInclude(d.className, 'foo bar zonk');
+    let result = await el.updateComplete;
+    assert.isFalse(result);
+    assert.equal(el.foo, 1);
+    assert.equal(el.updated, 1);
+    result = await el.updateComplete;
+    assert.isFalse(result);
+    assert.equal(el.foo, 2);
+    assert.equal(el.updated, 2);
+    result = await el.updateComplete;
+    assert.isTrue(result);
   });
 
-  test('styleString updates style', async () => {
+  test('setting properties after `super.update` can await until updateComplete returns true', async () => {
     class E extends LitElement {
+
       static get properties() {
         return {
-          marginTop : String,
-          paddingTop : String,
-          zug : String
+          foo: {}
         };
       }
+      foo = 0;
+      updated = 0;
 
-      marginTop = ``;
-      paddingTop = ``;
-      zug = `0px`;
+      update(changed: PropertyValues) {
+        this.updated++;
+        super.update(changed);
+        if (this.foo < 10) {
+          this.foo++;
+        }
+      }
 
-      _render(
-          {marginTop, paddingTop, zug}:
-              {marginTop: string, paddingTop: string, zug: string}) {
-        return html`<div style$="${
-            styleString(
-                {marginTop, paddingTop, height : zug})}"></div>`;
+      render() {
+        return html``;
       }
+
     }
-    customElements.define('x-13', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
-    const d = el.shadowRoot!.querySelector('div')!;
-    let computed = getComputedStyle(d);
-    assert.equal(computed.getPropertyValue('margin-top'), '0px');
-    assert.equal(computed.getPropertyValue('height'), '0px');
-    el.marginTop = `2px`;
-    el.paddingTop = `5px`;
-    await el.renderComplete;
-    el.offsetWidth;
-    computed = getComputedStyle(d);
-    assert.equal(computed.getPropertyValue('margin-top'), '2px');
-    assert.equal(computed.getPropertyValue('height'), '0px');
-    assert.equal(computed.getPropertyValue('padding-top'), '5px');
-    el.marginTop = ``;
-    el.paddingTop = ``;
-    el.zug = ``;
-    await el.renderComplete;
-    assert.equal(d.style.cssText, '');
+    while (!await el.updateComplete) {}
+    assert.equal(el.foo, 10);
   });
 
-  test('warns when setting properties re-entrantly', async () => {
+  test('updateComplete can block properties set after `super.update`', async () => {
     class E extends LitElement {
-      _toggle: boolean = false;
 
-      _render() {
-        this._setProperty('foo', this._toggle ? 'fooToggle' : 'foo');
-        return html`hi`;
+      static get properties() {
+        return {
+          foo: {}
+        };
+      }
+      foo = 1;
+      updated = 0;
+      fooMax = 10;
+
+      update(changed: PropertyValues) {
+        this.updated++;
+        super.update(changed);
+        if (this.foo < this.fooMax) {
+          this.foo++;
+        }
+      }
+
+      render() {
+        return html``;
       }
 
-      _didRender() {
-        this._setProperty('zonk', this._toggle ? 'zonkToggle' : 'zonk');
+      get updateComplete(): Promise<any> {
+        return super.updateComplete.then((v) => v || this.updateComplete);
       }
 
     }
-    const calls: IArguments[] = [];
-    const orig = console.warn;
-    console.warn = function() { calls.push(arguments); };
-    customElements.define('x-14', E);
+    customElements.define(generateElementName(), E);
     const el = new E();
     container.appendChild(el);
-    assert.equal(calls.length, 2);
-    el._toggle = true;
-    el.requestRender();
-    await el.renderComplete;
-    assert.equal(calls.length, 4);
-    console.warn = orig;
+    const result = await el.updateComplete;
+    assert.isTrue(result);
+    assert.equal(el.foo, 10);
+    assert.equal(el.updated, 10);
   });
+
+  test('can await promise in updateComplete', async () => {
+    class E extends LitElement {
+
+      static get properties() {
+        return {
+          foo: {}
+        };
+      }
+      promiseFulfilled = false;
+      foo = 0;
+
+      render() {
+        return html`${this.foo}`;
+      }
+
+      get updateComplete() {
+        return (async () => {
+          return await super.updateComplete && await new Promise((resolve) => {
+            setTimeout(() => {
+              this.promiseFulfilled = true;
+              resolve(true);
+            }, 1);
+          });
+        })();
+      }
+
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    const result = await el.updateComplete;
+    assert.isTrue(result);
+    assert.isTrue(el.promiseFulfilled);
+  });
+
+  test('can await sub-element updateComplete', async () => {
+    class E extends LitElement {
+
+      static get properties() {
+        return {
+          foo: {}
+        };
+      }
+      promiseFulfilled = false;
+      foo = 'hi';
+
+      render() {
+        return html`${this.foo}`;
+      }
+
+      get updateComplete() {
+        return super.updateComplete.then(() => new Promise((resolve) => setTimeout(() => {
+          this.promiseFulfilled = true;
+          resolve(true);
+          }, 1)));
+      }
+
+    }
+    customElements.define('x-1224', E);
+
+    class F extends LitElement {
+
+      inner: E|null = null;
+
+      render() {
+        return html`<x-1224></x-1224>`;
+      }
+
+      firstRendered() {
+        this.inner = this.shadowRoot!.querySelector('x-1224');
+      }
+
+      get updateComplete() {
+        return super.updateComplete.then(() => {
+          this.inner!.foo = 'yo';
+          return this.inner!.updateComplete;
+        });
+      }
+
+    }
+    customElements.define(generateElementName(), F);
+    const el = new F();
+    container.appendChild(el);
+    const result = await el.updateComplete;
+    assert.isTrue(result);
+    assert.equal(el.inner!.shadowRoot!.textContent, 'yo');
+    assert.isTrue(el.inner!.promiseFulfilled);
+  });
+
+  test('properties set before upgrade are applied', async () => {
+    const name = generateElementName();
+    const el = document.createElement(name);
+    container.appendChild(el);
+    (el as any).foo = 'hi';
+    (el as any).bar = false;
+    const objectValue = {};
+    (el as any).zug = objectValue;
+    class E extends LitElement {
+      static get properties() {
+        return {
+          foo: {},
+          bar: {},
+          zug: {}
+        };
+      }
+
+      foo = '';
+      bar = true;
+      zug = null;
+
+      render() {
+        return html`test`;
+      }
+    }
+    customElements.define(name, E);
+    await (el as LitElement).updateComplete;
+    assert.equal((el as any).foo, 'hi');
+    assert.equal((el as any).bar, false);
+    assert.equal((el as any).zug, objectValue);
+  });
+
+  test('can set properties and attributes on sub-element', async () => {
+    class E extends LitElement {
+
+      static get properties() {
+        return {
+          foo: {},
+          attr: {},
+          bool: {type: Boolean}
+        };
+      }
+      foo = 'hi';
+      bool = false;
+
+      render() {
+        return html`${this.foo}`;
+      }
+
+    }
+    customElements.define('x-2448', E);
+
+    class F extends LitElement {
+
+      inner: E|null = null;
+
+      static get properties() {
+        return {
+          bar: {},
+          bool: {type: Boolean}
+        };
+      }
+      bar = 'outer';
+      bool = false;
+
+      render() {
+        return html`<x-2448 .foo="${this.bar}" attr="${this.bar}" .bool="${this.bool}"></x-2448>`;
+      }
+
+      firstRendered() {
+        this.inner = this.shadowRoot!.querySelector('x-2448');
+      }
+
+      get updateComplete() {
+        return super.updateComplete.then(() => this.inner!.updateComplete);
+      }
+
+    }
+    customElements.define(generateElementName(), F);
+    const el = new F();
+    container.appendChild(el);
+    await el.updateComplete;
+    assert.equal(el.inner!.shadowRoot!.textContent, 'outer');
+    assert.equal((el.inner! as any).attr, 'outer');
+    assert.equal(el.inner!.getAttribute('attr'), 'outer');
+    assert.equal(el.inner!.bool, false);
+    el.bar = 'test';
+    el.bool = true;
+    await el.updateComplete;
+    assert.equal(el.inner!.shadowRoot!.textContent, 'test');
+    assert.equal((el.inner! as any).attr, 'test');
+    assert.equal(el.inner!.getAttribute('attr'), 'test');
+    assert.equal(el.inner!.bool, true);
+  });
+
 });
diff --git a/src/test/render-helpers_test.ts b/src/test/render-helpers_test.ts
new file mode 100644
index 00000000..1a02fff1
--- /dev/null
+++ b/src/test/render-helpers_test.ts
@@ -0,0 +1,126 @@
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at
+ * http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at
+ * http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at
+ * http://polymer.github.io/PATENTS.txt
+ */
+
+import {html, LitElement} from '../lit-element.js';
+import {classString, styleString} from '../lib/render-helpers.js';
+
+import {generateElementName} from './test-helpers.js';
+
+const assert = chai.assert;
+
+suite('Render Helpers', () => {
+  let container: HTMLElement;
+
+  setup(() => {
+    container = document.createElement('div');
+    document.body.appendChild(container);
+  });
+
+  teardown(() => {
+    if (container && container.parentNode) {
+      container.parentNode.removeChild(container);
+    }
+  });
+
+  test('classString updates classes', async () => {
+    class E extends LitElement {
+      static get properties() {
+        return {
+          foo: {},
+          bar: {},
+          baz: {}
+        };
+      }
+
+      foo = 0;
+      bar = true;
+      baz = false;
+
+      render() {
+        const {foo, bar, baz} = this;
+        return html
+        `<div class="${classString({ foo, bar, zonk: baz })}"></div>`;
+      }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    const d = el.shadowRoot!.querySelector('div')!;
+    assert.include(d.className, 'bar');
+    el.foo = 1;
+    el.baz = true;
+    await el.updateComplete;
+    assert.include(d.className, 'foo bar zonk');
+    el.bar = false;
+    await el.updateComplete;
+    assert.include(d.className, 'foo zonk');
+    el.foo = 0;
+    el.baz = false;
+    await el.updateComplete;
+    assert.notInclude(d.className, 'foo bar zonk');
+  });
+
+  // TODO(sorvell): skip until fixed in IE11
+  // blocked on https://github.com/Polymer/lit-html/issues/425.
+  test.skip('styleString updates style', async () => {
+    class E extends LitElement {
+      static get properties() {
+        return {
+          marginTop: {},
+          paddingTop: {},
+          zug: {}
+        };
+      }
+
+      marginTop = ``;
+      paddingTop = ``;
+      zug = `0px`;
+
+      render() {
+        const {marginTop, paddingTop, zug} = this;
+        return html`<div style="${
+            styleString({
+              marginTop,
+              paddingTop,
+              height: zug
+          })}"></div>`;
+      }
+    }
+    customElements.define(generateElementName(), E);
+    const el = new E();
+    container.appendChild(el);
+    await el.updateComplete;
+    const d = el.shadowRoot!.querySelector('div')!;
+    let computed = getComputedStyle(d);
+    assert.equal(d.getAttribute('style'), 'height: 0px');
+    assert.equal(computed.getPropertyValue('margin-top'), '0px');
+    assert.equal(computed.getPropertyValue('height'), '0px');
+    el.marginTop = `2px`;
+    el.paddingTop = `5px`;
+    await el.updateComplete;
+    assert.equal(d.getAttribute('style'), 'margin-top: 2px; padding-top: 5px; height: 0px');
+    el.offsetWidth;
+    computed = getComputedStyle(d);
+    assert.equal(computed.getPropertyValue('margin-top'), '2px');
+    assert.equal(computed.getPropertyValue('height'), '1px');
+    assert.equal(computed.getPropertyValue('padding-top'), '5px');
+    el.marginTop = ``;
+    el.paddingTop = ``;
+    el.zug = ``;
+    await el.updateComplete;
+    assert.equal(d.getAttribute('style'), '');
+  });
+
+});
diff --git a/src/test/test-helpers.ts b/src/test/test-helpers.ts
index e6e6ca70..19ad46d0 100644
--- a/src/test/test-helpers.ts
+++ b/src/test/test-helpers.ts
@@ -14,3 +14,14 @@
 
 export const stripExpressionDelimeters = (html: string) =>
     html.replace(/<!---->/g, '');
+
+let count = 0;
+export const generateElementName = () => `x-${count++}`;
+
+export const nextFrame = () => new Promise((resolve) => requestAnimationFrame(resolve));
+
+export const getComputedStyleValue = (element: Element, property: string) =>
+    window.ShadyCSS ? window.ShadyCSS.getComputedStyleValue(element, property) :
+    getComputedStyle(element).getPropertyValue(property);
+
+
diff --git a/test/runner.html b/test/runner.html
index cd1f7866..74c4b8fb 100644
--- a/test/runner.html
+++ b/test/runner.html
@@ -15,5 +15,6 @@
 </head>
 <body>
   <script type="module" src="lit-element_test.js"></script>
+  <script type="module" src="render-helpers_test.js"></script>
   <script type="module" src="lit-element_styling_test.js"></script>
 </body></html>
diff --git a/tsconfig.json b/tsconfig.json
index 9da59179..b714db5b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,7 +14,8 @@
     "noFallthroughCasesInSwitch": true,
     "outDir": "./",
     // Only necessary because @types/uglify-js can't find types for source-map
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "experimentalDecorators": true
   },
   "include": [
     "custom_typings/**/*.ts",
diff --git a/tslint.json b/tslint.json
index 974d6b9a..54984fb6 100644
--- a/tslint.json
+++ b/tslint.json
@@ -6,7 +6,6 @@
       true,
       "spaces"
     ],
-    "no-any": true,
     "prefer-const": true,
     "no-duplicate-variable": true,
     "no-eval": true,