Functions in CSS?
css-tricks.com
css-tricks.com
There are some quirks and syntax to these CSS functions I don't love, but I won't complain when we're using basic web standards stuff across the board.
Being able to easily do multi-line and nested comments when working on a design saves a non-zero amount of time and brain cycles.
HTML and CSS comments are the absolute worst.
If this is the goal, I'd rather see the spec updated to address the "hack-ish CSS" directly rather than introducing functions to the mix. This seems to be making CSS more complicated rather than simpler.