text: /**
   * @license
   * Copyright 2018 Google Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  /**
   * @fileoverview A "ponyfill" is a polyfill that doesn't modify the global prototype chain.
   * This makes ponyfills safer than traditional polyfills, especially for libraries like MDC.
   */
  function closest(element, selector) {
      if (element.closest) {
          return element.closest(selector);
      }
      var el = element;
      while (el) {
          if (matches(el, selector)) {
              return el;
          }
          el = el.parentElement;
      }
      return null;
  }
  function matches(element, selector) {
      var nativeMatches = element.matches
          || element.webkitMatchesSelector
          || element.msMatchesSelector;
      return nativeMatches.call(element, selector);
  }
  /**
   * Used to compute the estimated scroll width of elements. When an element is
   * hidden due to display: none; being applied to a parent element, the width is
   * returned as 0. However, the element will have a true width once no longer
   * inside a display: none context. This method computes an estimated width when
   * the element is hidden or returns the true width when the element is visble.
   * @param {Element} element the element whose width to estimate
   */
  function estimateScrollWidth(element) {
      // Check the offsetParent. If the element inherits display: none from any
      // parent, the offsetParent property will be null (see
      // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent).
      // This check ensures we only clone the node when necessary.
      var htmlEl = element;
      if (htmlEl.offsetParent !== null) {
          return htmlEl.scrollWidth;
      }
      var clone = htmlEl.cloneNode(true);
      clone.style.setProperty('position', 'absolute');
      clone.style.setProperty('transform', 'translate(-9999px, -9999px)');
      document.documentElement.appendChild(clone);
      var scrollWidth = clone.scrollWidth;
      document.documentElement.removeChild(clone);
      return scrollWidth;
  }
  
  export { closest, estimateScrollWidth, matches };
  