docs: function prefixes(what, where) {
    where = where || global;
  
    if (what in where) return where[what];
    else for (var i = 0, key; i < prefixes.vendor.length; i++) {
      key = prefixes.vendor[i] + what.charAt(0).toUpperCase() + what.slice(1);
  
      if (key in where) {
        return where[key];
      }
    }
  }