(function() {
  'use strict';
  // load polyfill for smoothscroll if needed
  let scrollBehaviorSupported = ('scrollBehavior' in document.documentElement.style);
  if (!scrollBehaviorSupported) {
    let script = document.createElement('script');
    script.async = true;
    script.src = '../bower_components/smoothscroll/dist/smoothscroll.js';
    script.onload = onload;
    document.head.appendChild(script);
  }
})();