Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components/paper-button/paper-button.html

 <!--
 @license
 Copyright (c) 2015 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
 The complete set of authors may be found at http://polymer.github.io/AUTHORS
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS
 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
 -->
 
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../paper-material/paper-material.html">
+<link rel="import" href="../paper-ripple/paper-ripple.html">
+<link rel="import" href="../paper-behaviors/paper-button-behavior.html">
+
 <!--
 
 Material Design: <a href="http://www.google.com/design/spec/components/buttons.html">Buttons</a>
 
 `paper-button` is a button. When the user touches the button, a ripple effect emanates
 from the point of contact. It may be flat or raised. A raised button is styled with a
 shadow.
 
 Example:
 
     <paper-button>flat button</paper-button>
     <paper-button raised>raised button</paper-button>
     <paper-button noink>No ripple effect</paper-button>
 
 You may use custom DOM in the button body to create a variety of buttons. For example, to
 create a button with an icon and some text:
 
     <paper-button>
       <core-icon icon="favorite"></core-icon>
       custom button content
     </paper-button>
 
-## Styling
+### Styling
 
 Style the button with CSS as you would a normal DOM element.
 
     /* make #my-button green with yellow text */
     #my-button {
         background: green;
         color: yellow;
     }
 
 By default, the ripple is the same color as the foreground at 25% opacity. You may
 customize the color using this selector:
 
     /* make #my-button use a blue ripple instead of foreground color */
     #my-button::shadow paper-ripple {
       color: blue;
     }
 
 The opacity of the ripple is not customizable via CSS.
 
+The following custom properties and mixins are also available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-button-flat-focus-color` | Background color of a focused flat button | `--paper-grey-200`
+`--paper-button` | Mixin applied to the button | `{}`
+`--paper-button-disabled` | Mixin applied to the disabled button | `{}`
+
+@demo demo/index.html
 -->
 
-<link rel="import" href="../polymer/polymer.html">
-<link rel="import" href="../paper-material/paper-material.html">
-<link rel="import" href="../paper-ripple/paper-ripple.html">
-
-<link rel="import" href="../paper-behaviors/paper-button-behavior.html">
-
 <dom-module id="paper-button">
 
   <style>
 
     :host {
       display: inline-block;
       position: relative;
       box-sizing: border-box;
       min-width: 5.14em;
       margin: 0 0.29em;
       background: transparent;
       text-align: center;
       font: inherit;
       text-transform: uppercase;
       outline: none;
       border-radius: 3px;
       -moz-user-select: none;
       -ms-user-select: none;
       -webkit-user-select: none;
       user-select: none;
       cursor: pointer;
       z-index: 0;
+
+      @apply(--paper-button);
+    }
+
+    .keyboard-focus {
+      font-weight: bold;
     }
 
     :host([disabled]) {
       background: #eaeaea;
       color: #a8a8a8;
       cursor: auto;
       pointer-events: none;
+
+      @apply(--paper-button-disabled);
     }
 
     :host([noink]) paper-ripple {
       display: none;
     }
 
     paper-material {
       border-radius: inherit;
     }
 
     .content > ::content * {
       text-transform: inherit;
     }
 
     .content {
       padding: 0.7em 0.57em
     }
   </style>
 
   <template>
 
     <paper-ripple></paper-ripple>
 
-    <paper-material class="content" elevation="[[_elevation]]" animated>
+    <paper-material class$="[[_computeContentClass(receivedFocusFromKeyboard)]]" elevation="[[_elevation]]" animated>
       <content></content>
     </paper-material>
 
   </template>
 
 </dom-module>
 
 <script>
 
   Polymer({
 
     is: 'paper-button',
 
     behaviors: [
       Polymer.PaperButtonBehavior
     ],
 
     properties: {
 
       /**
        * If true, the button should be styled with a shadow.
-       *
-       * @attribute raised
-       * @type boolean
-       * @default false
        */
       raised: {
         type: Boolean,
         reflectToAttribute: true,
         value: false,
-        observer: '_buttonStateChanged'
-      }
-
-    },
-
-    ready: function() {
-      if (!this.hasAttribute('role')) {
-        this.setAttribute('role', 'button');
+        observer: '_calculateElevation'
       }
     },
 
-    _buttonStateChanged: function() {
-      this._calculateElevation();
+    _calculateElevation: function() {
+      if (!this.raised) {
+        this._elevation = 0;
+      } else {
+        Polymer.PaperButtonBehaviorImpl._calculateElevation.apply(this);
+      }
+    },
+
+    _computeContentClass: function(receivedFocusFromKeyboard) {
+      var className = 'content ';
+      if (receivedFocusFromKeyboard) {
+        className += ' keyboard-focus';
+      }
+      return className;
     }
-
   });
 
 </script>
-