code: function after (el, newEl) {
    if (typeof newEl === 'string') {
      return el.insertAdjacentHTML('afterend', newEl)
    } else {
      var next = el.nextSibling
      if (next) {
        return el.parentNode.insertBefore(newEl, next)
      } else {
        return el.parentNode.appendChild(newEl)
      }
    }
  }
docs: after : after(el, newEl)
  Inserts a new element `newEl` just after `el`.
  
  var after = require('dom101/after');
  var newNode = document.createElement('div');
  var button = document.querySelector('#submit');
  
  after(button, newNode);