Isn’t it even better to use HEX code?
As color mostly uses in CSS syntax, maybe it is better we use HEX code for them for the sake of performance.
First, the HEX color code compile faster by browser, and second as CSS code is plain text file and send over the network to client browse to compile, it is better use Hex code because shorter chars need to define color code compare to SL or RGB ( 7ch vs 16ch) and save bandwidth.