bootstrap 3 border-radius less mixin gone
twitter-bootstrap-3
Solution
Aha! I have located the answer...
Remove `.border-radius()` and `.border-*-*-radius mixins`. As only Android 2.1, iOS 3.2, and older desktop browsers require a prefixed version, we've removed the base mixin. Since we no longer require prefixes for independent corners, we've dropped those mixins as well. Mixins for a single side, like `.border-left-radius`, are still available.
From TWBS Pull 6342, specifically under LESS changes.
Problem
Bootstrap's `.border-radius()` mixin is no longer there in version 3. I am working on converting my codebase and thought of this omission as rather strange. Has `.border-radius` been replaced by some other mixin? Is its use discouraged, and if so why?