Add class to smileys

Please add a class to the markup for smiley images embedded in body fields. Without a way to identify smileys separate from other images, it is impossible to apply CSS only to smileys. In my case, I have borders around images, but I don't want those borders on smileys.

Better still, there should be one generic class (like "emoji" for example), and smiley-specific classes for each.