text: var count = 0;
  
  export default function(name) {
    return new Id("O-" + (name == null ? "" : name + "-") + ++count);
  }
  
  function Id(id) {
    this.id = id;
    this.href = new URL(`#${id}`, location) + "";
  }
  
  Id.prototype.toString = function() {
    return "url(" + this.href + ")";
  };
  