(function() {

// old browser or not ? if ( !('querySelector' in document && 'addEventListener' in window) ) { return; } window.document.documentElement.className += ' js-enabled';

function toggleNav() {

// Define targets var button = document.querySelector('.nav-button'); var target = document.querySelector('.navigation');

// click-touch event if ( button ) {

button.addEventListener('click', 
function (e) { 
  target.classList.toggle('is-opened'); 
  e.preventDefault();
}, false );

} } // end toggleNav()

toggleNav(); }());