Easing effect for absolutely ANYTHING: Transparency, volume level, effect parameters, animation frames, you name it. Pick from pre-defined easing effects or def...
Kinda off-topic, they have this "dimmer" class that appears when a messagebox pops up, it dims the background to be darker to draw attention to the messagebox which bothers my eyes so I remove the html element in the dev tools.
The JS plugin was working well about a month or two ago when I used it last. This plugin works well too, it just gets these errors in the editor.