When did they introduce fully customizable captions on YouTube?

[Colon capital V]

Turn on captions here:

Since when did they let you do cool shit like change the color, font, size and shake effects?

 

[We Are The Witches]

I have not used them, but looks like some time ago, and you can do more things.

https://www.youtube.com/watch?v=L-BgxLtMxh0