Comments

// Single line comment
/* Multi-line
comment */

Variables

@nice-blue: #5B83AD;
@light-blue: @nice-blue + #111;

At-rules

@media screen and (min-width: 320px) {}

Mixins

.bordered {
  border-top: dotted 1px black;
  border-bottom: solid 2px black;
}
#menu a {
  .bordered;
}
#header a {
  color: orange;
  #bundle > .button;
}

Mixins with parameters

.foo (@bg: #f5f5f5, @color: #900) {
  background: @bg;
  color: @color;
}
.bar {
  .foo();
}
.class1 {
  .mixin(@margin: 20px; @color: #33acfe);
}
.class2 {
  .mixin(#efca44; @padding: 40px);
}

Interpolation

@mySelector: banner;
.@{mySelector} {
  font-weight: bold;
}
@property: color;
.widget {
  @{property}: #0ee;
  background-@{property}: #999;
}

Known failures

There are certain edge cases where Prism will fail. There are always such cases in every regex-based syntax highlighter. However, Prism dares to be open and honest about them. If a failure is listed here, it doesn’t mean it will never be fixed. This is more of a “known bugs” list, just with a certain type of bug.

At-rules looking like variables

@import "some file.less";

At-rules containing interpolation

@import "@{themes}/tidal-wave.less";

extend is not highlighted consistently

nav ul {
  &:extend(.inline);
  background: blue;
}
.a:extend(.b) {}