src/accordion.js
function setToken(list, token, enabled){
		enabled ? list.add(token) : list.remove(token);
	}
function setToken(list, token, enabled){
		enabled ? list.add(token) : list.remove(token);
	}
function setToken ( list , token , enabled ) { enabled ? list . add ( token ) : list . remove ( token ) ; }
Conditionally add or remove a token from a token-list.

@param {DOMTokenList} list
@param {String} token
@param {Boolean} enabled
Conditionally add or remove a token from a token - list .