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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-icon/iron-icon.html">
+<link rel="import" href="../paper-behaviors/paper-inky-focus-behavior.html">
+<link rel="import" href="../paper-styles/default-theme.html">
+
+<!--
+Material design: [Icon toggles](https://www.google.com/design/spec/components/buttons.html#buttons-toggle-buttons)
+
+`paper-icon-button` is a button with an image placed at the center. When the user touches
+the button, a ripple effect emanates from the center of the button.
+
+`paper-icon-button` includes a default icon set.  Use `icon` to specify which icon
+from the icon set to use.
+
+    <paper-icon-button icon="menu"></paper-icon-button>
+
+See [`iron-iconset`](iron-iconset) for more information about
+how to use a custom icon set.
+
+Example:
+
+    <link href="path/to/iron-icons/iron-icons.html" rel="import">
+
+    <paper-icon-button icon="favorite"></paper-icon-button>
+    <paper-icon-button src="star.png"></paper-icon-button>
+
+To use `paper-icon-button` as a link, wrap it in an anchor tag. Since `paper-icon-button`
+will already receive focus, you may want to prevent the anchor tag from receiving focus
+as well by setting its tabindex to -1.
+
+    <a href="https://www.polymer-project.org" tabindex="-1">
+      <paper-icon-button icon="polymer"></paper-icon-button>
+    </a>
+
+### Styling
+
+Style the button with CSS as you would a normal DOM element. If you are using the icons
+provided by `iron-icons`, they will inherit the foreground color of the button.
+
+    /* make a red "favorite" button */
+    <paper-icon-button icon="favorite" style="color: red;"></paper-icon-button>
+
+By default, the ripple is the same color as the foreground at 25% opacity. You may
+customize the color using the `--paper-icon-button-ink-color` custom property.
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-icon-button-disabled-text` | The color of the disabled button | `--disabled-text-color`
+`--paper-icon-button-ink-color` | Selected/focus ripple color | `--primary-text-color`
+`--paper-icon-button` | Mixin for a button | `{}`
+`--paper-icon-button-disabled` | Mixin for a disabled button | `{}`
+`--paper-icon-button-hover` | Mixin for button on hover | `{}`
+
+@group Paper Elements
+@element paper-icon-button
+@demo demo/index.html
+-->
+
+<dom-module id="paper-icon-button">
+  <template strip-whitespace>
+    <style>
+      :host {
+        display: inline-block;
+        position: relative;
+        padding: 8px;
+        outline: none;
+        -webkit-user-select: none;
+        -moz-user-select: none;
+        -ms-user-select: none;
+        user-select: none;
+        cursor: pointer;
+        z-index: 0;
+        line-height: 1;
+
+        width: 40px;
+        height: 40px;
+
+        /* NOTE: Both values are needed, since some phones require the value to be `transparent`. */
+        -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+        -webkit-tap-highlight-color: transparent;
+
+        /* Because of polymer/2558, this style has lower specificity than * */
+        box-sizing: border-box !important;
+
+        @apply(--paper-icon-button);
+      }
+
+      :host #ink {
+        color: var(--paper-icon-button-ink-color, --primary-text-color);
+        opacity: 0.6;
+      }
+
+      :host([disabled]) {
+        color: var(--paper-icon-button-disabled-text, --disabled-text-color);
+        pointer-events: none;
+        cursor: auto;
+
+        @apply(--paper-icon-button-disabled);
+      }
+
+      :host(:hover) {
+        @apply(--paper-icon-button-hover);
+      }
+
+      iron-icon {
+        --iron-icon-width: 100%;
+        --iron-icon-height: 100%;
+      }
+    </style>
+
+    <iron-icon id="icon" src="[[src]]" icon="[[icon]]" alt$="[[alt]]"></iron-icon>
+  </template>
+
+</dom-module>
+<script>
+Polymer({
+  is: 'paper-icon-button',
+
+  hostAttributes: {
+    role: 'button',
+    tabindex: '0'
+  },
+
+  behaviors: [
+    Polymer.PaperInkyFocusBehavior
+  ],
+
+  properties: {
+    /**
+      * The URL of an image for the icon. If the src property is specified,
+      * the icon property should not be.
+      */
+    src: {
+      type: String
+    },
+
+    /**
+      * Specifies the icon name or index in the set of icons available in
+      * the icon's icon set. If the icon property is specified,
+      * the src property should not be.
+      */
+    icon: {
+      type: String
+    },
+
+    /**
+      * Specifies the alternate text for the button, for accessibility.
+      */
+    alt: {
+      type: String,
+      observer: "_altChanged"
+    }
+  },
+
+  _altChanged: function(newValue, oldValue) {
+    var label = this.getAttribute('aria-label');
+
+    // Don't stomp over a user-set aria-label.
+    if (!label || oldValue == label) {
+      this.setAttribute('aria-label', newValue);
+    }
+  }
+});
+</script>