code: function createDOM (rootDoc, id, option) {
    var el = rootDoc.getElementById(id);
    var head = rootDoc.getElementsByTagName('head')[0];
    if(el) {
      if(option.append) return el
      el.parentNode && el.parentNode.removeChild(el);
    }
    el = rootDoc.createElement('style');
    head.appendChild(el);
    el.setAttribute('id', id);
    if (option.attrs)
      for (var i in option.attrs) {
        el.setAttribute(i, option.attrs[i]);
      }
    return el
  }
docs: plugin for cssobj