CloudMade/Leaflet — pull request #805 by danzel (2012-07-15 21:47:57+00:00)
Title: Position tiles with transform for safari to get around animation errors.

For error #800

Chrome does layout positioning much faster if you use top/left (Verify in chromium in timeline, frames).
Safari (Mac) has issues during animations if you use top/left for tile positioning, so use transform there.

Other browsers don't seem to care, so they use top/left. (Tested on FF, IE9, Chrome, Opera, Mac Safari, iPad, Android 4, Android 4 Chrome)