code: function styleStringify (obj) {
    var key;
    var keyCount = 0;
    var i = 0;
    var str = '';
  
    for (key in obj) { keyCount++; }
  
    for (key in obj) {
      str += (key + ': ' + obj[key]);
      if (i < keyCount - 1) { str += '; '; }
      i++;
    }
    return str;
  }
docs: Convert an object into an attribute string