test.less

/* Variables */
@nice-blue: #5B83AD;
@light-blue: @nice-blue + #111;
 
#header { color: @light-blue; }
 
 
/* Mixins */
.bordered {
  border-top: dotted 1px black;
  border-bottom: solid 2px black;
}
 
#menu a {
  color: #111;
  .bordered;
}
 
.post a > .button {
  color: red;
  .bordered;
}
 
 
/* Parametric Mixins */
.border-radius (@radius: 5px) {
  border-radius: @radius; // comment
  -moz-border-radius: @radius;
  -webkit-border-radius: @radius;
}
 
#header {
  .border-radius(4px); //comment
}
.button {
  .border-radius(6px);
}
 
#header {
  .border-radius;
}
 
.wrap () {
  text-wrap: wrap;
  white-space: pre-wrap;
  white-space: -moz-pre-wrap;
  word-wrap: break-word;
}
 
pre { .wrap; }
 
 
/* Pattern-matching and Guard expressions */
 
 
/* Nested rules */
#header { color: black; }
#header .navigation {
  font-size: 12px;
}
#header .logo {
  width: 300px;
}
#header .logo:hover {
  text-decoration: none;
}
 
#header {
  color: black;
 
  .navigation {
    font-size: 12px;
  }
  .logo {
    width: 300px;
    &:hover { text-decoration: none; }
  }
}
 
#header {
  color: black;
  .navigation {
    font-size: 12px;
  }
  .logo {
    width: 300px;
    &:hover {
      text-decoration: none;
    }
  }
}
 
 
/* Operations */
@base: 5%;
@filler: @base * 2;
@other: @base + @filler;
 
#operations {
  color: #888 / 4;
  background-color: @base-color + #111;
  height: 100% / 2 + @filler;
}
 
@var: 1px + 5;
 
#operations2 {
  width: (@var + 5) * 2;
 
  border: (@width * 2) solid black;
}
 
 
/* Color functions */
lighten(@color, 10%);
darken(@color, 10%);
 
saturate(@color, 10%);
desaturate(@color, 10%);
 
fadein(@color, 10%);
fadeout(@color, 10%);
fade(@color, 50%);
 
spin(@color, 10);
spin(@color, -10);
 
mix(@color1, @color2);
 
@base: #f04615;
 
.class {
  color: saturate(@base, 5%);
  background-color: lighten(spin(@base, 8), 25%);
}
 
hue(@color);
saturation(@color);
lightness(@color);
alpha(@color);
 
hsl(hue(@old), 45%, 90%);
 
@new: hsl(hue(@old), 45%, 90%);
 
 
/* Math functions */
round(1.67);
ceil(2.4);
floor(2.6);
 
percentage(0.5);
 
 
/* Namespaces */
#bundle {
  .button {
    display: block;
    border: 1px solid black;
    background-color: grey;
    :hover {
      background-color: white;
    }
  }
  .tab {
    float: left;
  }
  .citation {
    display: none;
  }
}
 
#header a {
  color: orange;
  #bundle > .button;
}
 
 
/* Scope */
@var: red;
 
#page {
  @var: white;
  #header {
    color: @var; // white
  }
}
 
#footer {
  color: @var; // red
}
 
 
/* Comments */
/* Hello, I'm a CSS-style comment */
.class { color: black; }
 
// Hi, I'm a silent comment, I won't show up in your CSS
.class { color: white; }
 
 
/* Importing */
@import "lib.less";
@import "lib";
@import "lib.css";
 
 
/* String interpolation */
@base-url: "http://assets.fnord.com";
#interpolation {
	background-image: url("@{base-url}/images/bg.png");
}

/* Escaping */
.class {
  filter: ~"ms:alwaysHasItsOwnSyntax.For.Stuff()";
}
 
.class {
  filter: ms:alwaysHasItsOwnSyntax.For.Stuff();
}
 
 
/* Operations */
@base: 5%;
@filler: @base * 2;
@other: @base + @filler;
 
.operations {
  color: #888 / 4;
  background-color: @base-color + #111;
  height: 100% / 2 + @filler;
}