CSS opacity vs rgba: which one is better?

Question

Assuming you\'re applying a CSS opacity to a solid color. Is it better, in terms of memory and performance, to use an rgba value or the color+opacity?

Answer 1

opacity only applies to entire elements, so you cannot apply an alpha channel to a color using the opacity property. You can only do that with the rgba() (or hsla()) function.

So rgba()/hsla() is better in all aspects because that's the only way to do it.