In target manager, one year ago, url without http://www was possible. Why it is no more possible today? How about link to local embedded content?
Not sure whether I get you correctly.
Url validation may have been added in the past months to improve the overall consistency of values (e.g. protocol use). Url fields aren't meant to be used for relative paths (for security reason). In case you plan to load pages relative to your project sources or trigger custom events that way, I recommend you to implement the experience manually and avoid post-studio-export modifications.