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+<!--
+@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.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../iron-behaviors/iron-button-state.html">
+<link rel="import" href="paper-ripple-behavior.html">
+
+<script>
+  /** @polymerBehavior Polymer.PaperButtonBehavior */
+  Polymer.PaperButtonBehaviorImpl = {
+    properties: {
+      /**
+       * The z-depth of this element, from 0-5. Setting to 0 will remove the
+       * shadow, and each increasing number greater than 0 will be "deeper"
+       * than the last.
+       *
+       * @attribute elevation
+       * @type number
+       * @default 1
+       */
+      elevation: {
+        type: Number,
+        reflectToAttribute: true,
+        readOnly: true
+      }
+    },
+
+    observers: [
+      '_calculateElevation(focused, disabled, active, pressed, receivedFocusFromKeyboard)',
+      '_computeKeyboardClass(receivedFocusFromKeyboard)'
+    ],
+
+    hostAttributes: {
+      role: 'button',
+      tabindex: '0',
+      animated: true
+    },
+
+    _calculateElevation: function() {
+      var e = 1;
+      if (this.disabled) {
+        e = 0;
+      } else if (this.active || this.pressed) {
+        e = 4;
+      } else if (this.receivedFocusFromKeyboard) {
+        e = 3;
+      }
+      this._setElevation(e);
+    },
+
+    _computeKeyboardClass: function(receivedFocusFromKeyboard) {
+      this.toggleClass('keyboard-focus', receivedFocusFromKeyboard);
+    },
+
+    /**
+     * In addition to `IronButtonState` behavior, when space key goes down,
+     * create a ripple down effect.
+     *
+     * @param {!KeyboardEvent} event .
+     */
+    _spaceKeyDownHandler: function(event) {
+      Polymer.IronButtonStateImpl._spaceKeyDownHandler.call(this, event);
+      // Ensure that there is at most one ripple when the space key is held down.
+      if (this.hasRipple() && this.getRipple().ripples.length < 1) {
+        this._ripple.uiDownAction();
+      }
+    },
+
+    /**
+     * In addition to `IronButtonState` behavior, when space key goes up,
+     * create a ripple up effect.
+     *
+     * @param {!KeyboardEvent} event .
+     */
+    _spaceKeyUpHandler: function(event) {
+      Polymer.IronButtonStateImpl._spaceKeyUpHandler.call(this, event);
+      if (this.hasRipple()) {
+        this._ripple.uiUpAction();
+      }
+    }
+  };
+
+  /** @polymerBehavior */
+  Polymer.PaperButtonBehavior = [
+    Polymer.IronButtonState,
+    Polymer.IronControlState,
+    Polymer.PaperRippleBehavior,
+    Polymer.PaperButtonBehaviorImpl
+  ];
+</script>