code: function (selector, event, handler, scope) {
    (scope || document).addEventListener(event, function(event) {
      var listeningTarget = closest(event.target, selector)
      if (listeningTarget) {
        handler.call(listeningTarget, event)
      }
    })
  }
docs: An event handler.
  
  @callback eventHandler
  @param {Event} event - The event this handler was triggered for
   
  Delegates an event for a node matching a selector.
  @param {string} selector - The CSS selector
  @param {string} event - The event name
  @param {eventHandler} handler - The event handler function
  @param {HTMLElement} [scope=document] - Element to add the event listener to
  @private