embedded_libs/fmt-8.1.1/doc/bootstrap/mixins/opacity.less
browsing at commit = b9c4525717cd1c1c22f0bc71489e49485b4776da
// Opacity
.opacity(@opacity) {
opacity: @opacity;
// IE8 filter
@opacity-ie: (@opacity * 100);
filter: ~"alpha(opacity=@{opacity-ie})";
}