There are two different and identical configuration files. One is the "calendar_prod.json" which is loaded by default and the other is the "calendar_dev.json" which is only loaded in development mode
### Enable development-mode:
Add the following switch at the end of the URL of the web application to activate the deverlopmend mode
Unfortunately, older versions of Internet Explorer do not support CSS3 that well. The example calendar uses a fallback where the calendar doors are just hidden on hover.