old_contents: // xss-blacklist.js
  //
  // Middleware to serve an error page to browsers with XSS problems
  //
  // Copyright 2011-2012, E14N https://e14n.com/
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  var uaParser = require("ua-parser-js");
  
  var xssCheck = function(req, res, next) {
      var ua = uaParser(req.headers["user-agent"]);
  
      if (ua.browser.name === "IE" && Number(ua.browser.major) < 11) {
          res.render("xss-error");
          return;
      }
  
      next();
  };
  
  exports.xssCheck = xssCheck;
  
new_contents: // xssblacklist.js
  //
  // Middleware to serve an error page to browsers with XSS problems
  //
  // Copyright 2011-2012, E14N https://e14n.com/
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  var uaParser = require("ua-parser-js");
  
  var xssCheck = function(req, res, next) {
      var ua = uaParser(req.headers["user-agent"]);
  
      if (ua.browser.name === "IE" && Number(ua.browser.major) < 11) {
          res.render("xss-error");
          return;
      }
  
      next();
  };
  
  exports.xssCheck = xssCheck;
  
subject: Fix typo