Are hex transparent colors different from rgba()?

Question

css

At random, I accidentally discovered an "anomaly" in HEX colors, which I did not see anyone talking about. I didn’t quite understand how to find it, maybe Google should have scoured better. The bottom line is that everyone is used to using rgba(), but if you use #0009 (translucent black = #00000099) instead, would there be a difference? Do browsers that don't support rgba() support this? Or is it all the same?

Answer 1

https://stackoverflow.com/questions/7015302/css-he...

Answer 2

No, but rgba() is more convenient for gradient - less writing.