An administrator can enable certain experimental features in Settings > Site administration > Development > Experimental > Experimental settings.
An experimental feature is defined as a feature which require additional testing and bug-fixing.
- Safe exam browser
- Group members only - adding the 'Available for group members only' checkbox to the activity settings page
- CSS optimiser (new in Moodle 2.3)
- Drag and drop upload of text/links (see MDL-22504 for further details)