It happens sometimes Xcode version or any missing character on Info.plist.
Click on your Ingo.plist file and see on which line you have the error.
Write click on the file and open as code mode.
Because of error in 66 line I remove the block of code.
Now build your project again and submit again, for more follow this: https://stackoverflow.com/questions/34288475/itms-90037-the-info-plist-file-is-missing-or-could-not-be-parsed-while-app-store
Can its support pwa website for offline work?
The mobile device is not any server. So it’s will support basic HTML & CSS pages that’s supported on webview.