docs: function updateDOMListeners (oldVnode, vnode) {
  	  if (!oldVnode.data.on && !vnode.data.on) {
  	    return
  	  }
  	  var on = vnode.data.on || {};
  	  var oldOn = oldVnode.data.on || {};
  	  var add = vnode.elm._v_add || (vnode.elm._v_add = function (event, handler, capture) {
  	    vnode.elm.addEventListener(event, handler, capture);
  	  });
  	  var remove = vnode.elm._v_remove || (vnode.elm._v_remove = function (event, handler) {
  	    vnode.elm.removeEventListener(event, handler);
  	  });
  	  updateListeners(on, oldOn, add, remove, vnode.context);
  	}