@polymer/polymer/lib/utils/flush.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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<link rel="import" href="boot.html">
<link rel="import" href="debounce.html">
<script>
(function() {
  'use strict';

  /**
   * Forces several classes of asynchronously queued tasks to flush:
   * - Debouncers added via `enqueueDebouncer`
   * - ShadyDOM distribution
   *
   * @memberof Polymer
   * @return {void}
   */
  Polymer.flush = function() {
    let shadyDOM, debouncers;
    do {
      shadyDOM = window.ShadyDOM && ShadyDOM.flush();
      if (window.ShadyCSS && window.ShadyCSS.ScopingShim) {
        window.ShadyCSS.ScopingShim.flush();
      }
      debouncers = Polymer.flushDebouncers();
    } while (shadyDOM || debouncers);
  };

})();
</script>