on = (els, name = "", handler, options) => {
	_.eventListener("add", els, name, handler, options);
}
Add/remove event listener
@param {HTMLElement|HTMLElement[]|NodeList} els
@param {string} name - event name(s) to bind, e.g. "mouseup mousedown"; also
  accpets a comma separated string, e.g. "mouseup, mousedown"
@param {function} handler - event handler
@param {options} eventListener options