@polymer/polymer/polymer-element.html

The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to

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@license
Copyright (c) 2017 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
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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
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-->
<link rel="import" href="lib/mixins/element-mixin.html">
<!-- import html-tag to export html -->
<link rel="import" href="lib/utils/html-tag.html">
<script>
(function() {
  'use strict';

  /**
   * Base class that provides the core API for Polymer's meta-programming
   * features including template stamping, data-binding, attribute deserialization,
   * and property change observation.
   *
   * @customElement
   * @memberof Polymer
   * @constructor
   * @implements {Polymer_ElementMixin}
   * @extends {HTMLElement}
   * @appliesMixin Polymer.ElementMixin
   * @summary Custom element base class that provides the core API for Polymer's
   *   key meta-programming features including template stamping, data-binding,
   *   attribute deserialization, and property change observation
   */
  Polymer.Element = Polymer.ElementMixin(HTMLElement);

  // NOTE: this is here for modulizer to export `html` for the module version of this file
  Polymer.html = Polymer.html;
})();
</script>