Not possible natively with Xenforo, the current forum software. But there exist a number of add-ons that might do this. Since each one of them (as far as I tested) is outdated or unmaintained, I doubt that YoYo would even think about using them.
Also, no answer is the "best" answer technically. Everybody takes time and puts their effort in responding to a thread, so choosing one of them as the "best" answer would be partiality IMO.