Less is an actively used stylesheet language created in 2009.

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Example code from Linguist:

@blue: #3bbfce;
@margin: 16px;

.content-navigation {
  border-color: @blue;
  color:
    darken(@blue, 9%);
}

.border {
  padding: @margin / 2;
  margin: @margin / 2;
  border-color: @blue;
}

Example code from Wikipedia:

#header {
  color: #333333;
  border-left: 1px;
  border-right: 3px;
}
#footer {
  color: #114411;
  border-color: #7d2717;
}
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Last updated February 11th, 2019