less.js/test/less/colors.less

#yelow {
  #short {
    color: #fea;
  }
  #long {
    color: #ffeeaa;
  }
  #rgba {
    color: rgba(255, 238, 170, 0.1);
  }
  #argb {
    color: argb(rgba(255, 238, 170, 0.1));
  }
}

#blue {
  #short {
    color: #00f;
  }
  #long {
    color: #0000ff;
  }
  #rgba {
    color: rgba(0, 0, 255, 0.1);
  }
  #argb {
    color: argb(rgba(0, 0, 255, 0.1));
  }
}

#alpha #hsla {
    color: hsla(11, 20%, 20%, 0.6);
}

#overflow {
  .a { color: #111111 - #444444; } // #000000
  .b { color: #eee + #fff; } // #ffffff
  .c { color: #aaa * 3; } // #ffffff
  .d { color: #00ee00 + #009900; } // #00ff00
}

#grey {
  color: rgb(200, 200, 200);
}

#333333 {
  color: rgb(20%, 20%, 20%);
}

#808080 {
  color: hsl(50, 0%, 50%);
}

#00ff00 {
  color: hsl(120, 100%, 50%);
}

.lightenblue {
    color: lighten(blue, 10%);
}

.darkenblue {
    color: darken(blue, 10%);
}

.unknowncolors {
    color: blue2;
    border: 2px solid superred;
}

.transparent {
    color: transparent;
    background-color: rgba(0, 0, 0, 0);
}
#alpha {
    @colorvar: rgba(150, 200, 150, 0.7);
    #fromvar {
        opacity: alpha(@colorvar);
    }
    #short {
        opacity: alpha(#aaa);
    }
    #long {
        opacity: alpha(#bababa);
    }
    #rgba {
        opacity: alpha(rgba(50, 120, 95, 0.2));
    }
    #hsl {
        opacity: alpha(hsl(120, 100%, 50%));
    }
}