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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="../paper-styles/default-theme.html">
+<link rel="import" href="../paper-styles/typography.html">
+<link rel="import" href="paper-input-addon-behavior.html">
+
+<!--
+`<paper-input-error>` is an error message for use with `<paper-input-container>`. The error is
+displayed when the `<paper-input-container>` is `invalid`.
+
+    <paper-input-container>
+      <input is="iron-input" pattern="[0-9]*">
+      <paper-input-error>Only numbers are allowed!</paper-input-error>
+    </paper-input-container>
+
+### Styling
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-input-container-invalid-color` | The foreground color of the error | `--error-color`
+`--paper-input-error`                   | Mixin applied to the error        | `{}`
+-->
+
+<dom-module id="paper-input-error">
+  <template>
+    <style>
+      :host {
+        display: inline-block;
+        visibility: hidden;
+
+        color: var(--paper-input-container-invalid-color, --error-color);
+
+        @apply(--paper-font-caption);
+        @apply(--paper-input-error);
+        position: absolute;
+        left:0;
+        right:0;
+      }
+
+      :host([invalid]) {
+        visibility: visible;
+      };
+    </style>
+
+    <content></content>
+  </template>
+</dom-module>
+
+<script>
+  Polymer({
+    is: 'paper-input-error',
+
+    behaviors: [
+      Polymer.PaperInputAddonBehavior
+    ],
+
+    properties: {
+      /**
+       * True if the error is showing.
+       */
+      invalid: {
+        readOnly: true,
+        reflectToAttribute: true,
+        type: Boolean
+      }
+    },
+
+    /**
+     * This overrides the update function in PaperInputAddonBehavior.
+     * @param {{
+     *   inputElement: (Element|undefined),
+     *   value: (string|undefined),
+     *   invalid: boolean
+     * }} state -
+     *     inputElement: The input element.
+     *     value: The input value.
+     *     invalid: True if the input value is invalid.
+     */
+    update: function(state) {
+      this._setInvalid(state.invalid);
+    }
+  });
+</script>