I read here...
...that the visibility classes are being deprecated in 6.5.
"Deprecation Notice: From v6.5.x, we are moving visibility classes to Prototype specific mode and thus visibility classes will be disabled by default. You can re-enable it though, with a simple
Could you explain the reason behind this deprecation? We have found these classes very helpful in our responsive design work, and I'm curious as to the reasoning for this.