Writing browser specific hack in Less (for <IE9)

Question

I want to do something like this (Source - CSS Tricks Article):

#veinte { color/*\\**/: blue\\9; }

in

Answer 1

Property name interpolation is possible with Less v1.6.0 and above. Hence this hack can be implemented as shown below:

@hack: ~"/*\**/";
#veinte { 
    color@{hack}: blue\9; 
}

Compiled CSS:

#veinte {
    color/*\**/: blue\9;
}