document.querySelector('.copyswitch nav').addEventListener('click',function(e){var link=e.target.closest('a');if(!link)return;e.preventDefault();var items=this.querySelectorAll('li');var tabs=this.closest('.copyswitch').querySelectorAll('.tab');var index=Array.prototype.indexOf.call(items,link.parentElement);items.forEach(function(li){li.classList.remove('active')});tabs.forEach(function(tab){tab.classList.add('hidden')});items[index].classList.add('active');tabs[index].classList.remove('hidden')})