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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-meta/iron-meta.html">
+
+<script>
+  /**
+   * Singleton IronMeta instance.
+   */
+  Polymer.IronValidatableBehaviorMeta = null;
+
+  /**
+   * `Use Polymer.IronValidatableBehavior` to implement an element that validates user input.
+   * Use the related `Polymer.IronValidatorBehavior` to add custom validation logic to an iron-input.
+   *
+   * By default, an `<iron-form>` element validates its fields when the user presses the submit button.
+   * To validate a form imperatively, call the form's `validate()` method, which in turn will
+   * call `validate()` on all its children. By using `Polymer.IronValidatableBehavior`, your
+   * custom element will get a public `validate()`, which
+   * will return the validity of the element, and a corresponding `invalid` attribute,
+   * which can be used for styling.
+   *
+   * To implement the custom validation logic of your element, you must override
+   * the protected `_getValidity()` method of this behaviour, rather than `validate()`.
+   * See [this](https://github.com/PolymerElements/iron-form/blob/master/demo/simple-element.html)
+   * for an example.
+   *
+   * ### Accessibility
+   *
+   * Changing the `invalid` property, either manually or by calling `validate()` will update the
+   * `aria-invalid` attribute.
+   *
+   * @demo demo/index.html
+   * @polymerBehavior
+   */
+  Polymer.IronValidatableBehavior = {
+
+    properties: {
+      /**
+       * Name of the validator to use.
+       */
+      validator: {
+        type: String
+      },
+
+      /**
+       * True if the last call to `validate` is invalid.
+       */
+      invalid: {
+        notify: true,
+        reflectToAttribute: true,
+        type: Boolean,
+        value: false,
+        observer: '_invalidChanged'
+      },
+    },
+
+    registered: function() {
+      Polymer.IronValidatableBehaviorMeta = new Polymer.IronMeta({type: 'validator'});
+    },
+
+    _invalidChanged: function() {
+      if (this.invalid) {
+        this.setAttribute('aria-invalid', 'true');
+      } else {
+        this.removeAttribute('aria-invalid');
+      }
+    },
+
+    /* Recompute this every time it's needed, because we don't know if the
+     * underlying IronValidatableBehaviorMeta has changed. */
+    get _validator() {
+      return Polymer.IronValidatableBehaviorMeta &&
+          Polymer.IronValidatableBehaviorMeta.byKey(this.validator);
+    },
+
+    /**
+     * @return {boolean} True if the validator `validator` exists.
+     */
+    hasValidator: function() {
+      return this._validator != null;
+    },
+
+    /**
+     * Returns true if the `value` is valid, and updates `invalid`. If you want
+     * your element to have custom validation logic, do not override this method;
+     * override `_getValidity(value)` instead.
+
+     * @param {Object} value Deprecated: The value to be validated. By default,
+     * it is passed to the validator's `validate()` function, if a validator is set.
+     * If this argument is not specified, then the element's `value` property
+     * is used, if it exists.
+     * @return {boolean} True if `value` is valid.
+     */
+    validate: function(value) {
+      // If this is an element that also has a value property, and there was
+      // no explicit value argument passed, use the element's property instead.
+      if (value === undefined && this.value !== undefined)
+        this.invalid = !this._getValidity(this.value);
+      else
+        this.invalid = !this._getValidity(value);
+      return !this.invalid;
+    },
+
+    /**
+     * Returns true if `value` is valid.  By default, it is passed
+     * to the validator's `validate()` function, if a validator is set. You
+     * should override this method if you want to implement custom validity
+     * logic for your element.
+     *
+     * @param {Object} value The value to be validated.
+     * @return {boolean} True if `value` is valid.
+     */
+
+    _getValidity: function(value) {
+      if (this.hasValidator()) {
+        return this._validator.validate(value);
+      }
+      return true;
+    }
+  };
+
+</script>