Currently, all .mw-ui-feature-checkbox divs are being floated left because when it's used in feature fields it has 'Information' and 'Discussion' to its right. However, there is one usage of the checkbox that doesn't have anything next to it: the betafeatures-auto-enroll one. This does not need to float left because there's nothing to its right.

This doesn't normally matter, because it's in a table cell and doesn't break anything, but if it's used instead in a form with the 'div' display format then things can get a bit wonky.

(This is with regard to making it work with global preferences.)