As easily seen in this testcase: http://jsfiddle.net/mH4xM/ Applying something like -webkit-transform: translate3d(50px,50px,0); to a textarea element leads to the caret not being animated and not reacting to cursor movement. We use this in a note-taking web application and it breaks the feature. The bug is present in both current versions of Chrome and Safari (including nightly). It's probably a repainting issue.
The same applies to contentEditable fields, not only to textareas, as this test case demonstrates: http://jsfiddle.net/dbXUZ/
Is this duplicate of bug 18751?
Yep. *** This bug has been marked as a duplicate of bug 18751 ***