bootstrap-progressbar/resources/bootstrap-3.3.0/mixins/progress-bar.less

progressbar interactions for twitter bootstrap 2 & 3

// Progress bars

.progress-bar-variant(@color) {
  background-color: @color;

  // Deprecated parent class requirement as of v3.2.0
  .progress-striped & {
    #gradient > .striped();
  }
}