@polymer/paper-dropdown-menu/paper-dropdown-menu-icons.js

An element that works similarly to a native browser select

/**
@license
Copyright (c) 2016 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
*/
import '@polymer/iron-iconset-svg/iron-iconset-svg.js';
const $_documentContainer = document.createElement('template');
$_documentContainer.setAttribute('style', 'display: none;');

$_documentContainer.innerHTML =
    `<iron-iconset-svg name="paper-dropdown-menu" size="24">
<svg><defs>
<g id="arrow-drop-down"><path d="M7 10l5 5 5-5z"></path></g>
</defs></svg>
</iron-iconset-svg>`;

document.head.appendChild($_documentContainer.content);