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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-validatable-behavior/iron-validatable-behavior.html">
+<link rel="import" href="../iron-form-element-behavior/iron-form-element-behavior.html">
+
+<script>
+
+  /**
+   * Use `Polymer.IronCheckedElementBehavior` to implement a custom element
+   * that has a `checked` property, which can be used for validation if the
+   * element is also `required`. Element instances implementing this behavior
+   * will also be registered for use in an `iron-form` element.
+   *
+   * @demo demo/index.html
+   * @polymerBehavior Polymer.IronCheckedElementBehavior
+   */
+  Polymer.IronCheckedElementBehaviorImpl = {
+
+    properties: {
+      /**
+       * Fired when the checked state changes.
+       *
+       * @event iron-change
+       */
+
+      /**
+       * Gets or sets the state, `true` is checked and `false` is unchecked.
+       */
+      checked: {
+        type: Boolean,
+        value: false,
+        reflectToAttribute: true,
+        notify: true,
+        observer: '_checkedChanged'
+      },
+
+      /**
+       * If true, the button toggles the active state with each tap or press
+       * of the spacebar.
+       */
+      toggles: {
+        type: Boolean,
+        value: true,
+        reflectToAttribute: true
+      },
+
+      /* Overriden from Polymer.IronFormElementBehavior */
+      value: {
+        type: String,
+        value: 'on',
+        observer: '_valueChanged'
+      }
+    },
+
+    observers: [
+      '_requiredChanged(required)'
+    ],
+
+    created: function() {
+      // Used by `iron-form` to handle the case that an element with this behavior
+      // doesn't have a role of 'checkbox' or 'radio', but should still only be
+      // included when the form is serialized if `this.checked === true`.
+      this._hasIronCheckedElementBehavior = true;
+    },
+
+    /**
+     * Returns false if the element is required and not checked, and true otherwise.
+     * @param {*=} _value Ignored.
+     * @return {boolean} true if `required` is false or if `checked` is true.
+     */
+    _getValidity: function(_value) {
+      return this.disabled || !this.required || this.checked;
+    },
+
+    /**
+     * Update the aria-required label when `required` is changed.
+     */
+    _requiredChanged: function() {
+      if (this.required) {
+        this.setAttribute('aria-required', 'true');
+      } else {
+        this.removeAttribute('aria-required');
+      }
+    },
+
+    /**
+     * Fire `iron-changed` when the checked state changes.
+     */
+    _checkedChanged: function() {
+      this.active = this.checked;
+      this.fire('iron-change');
+    },
+
+    /**
+     * Reset value to 'on' if it is set to `undefined`.
+     */
+    _valueChanged: function() {
+      if (this.value === undefined || this.value === null) {
+        this.value = 'on';
+      }
+    }
+  };
+
+  /** @polymerBehavior Polymer.IronCheckedElementBehavior */
+  Polymer.IronCheckedElementBehavior = [
+    Polymer.IronFormElementBehavior,
+    Polymer.IronValidatableBehavior,
+    Polymer.IronCheckedElementBehaviorImpl
+  ];
+
+</script>