CSS Comments
CSS only support old school C comments - that begin with /* and end with */ like this:
/* This is a comment */
/* This rule is commented out
.MAINpanel { border: black solid; }
*/
The big problem with CSS comments is you that you cannot easily nest them. Probably the best tool is to be rigorous about separating concerns and keep each CSS file small so you don’t have to comment big sections of CSS at time.