Power Pages Form Validation and the benefits of Webfiles

For the Lead form we only want to allow entries for persons older than 18 years. A great fit for Client Site Validation, but there is a bug in the code, and the debugging tools are not working correctly! With the usage of Webfiles we can get a better debugging experience to quickly find the error. And with using Fiddler we can even test some fixes without deploying a change to the server to avoid the time this takes.