example 10a.scss

.post--big{
  width: percentage(.5);
  font-size: max(12px, 14px, 16px);
  background: rgba(231, 0.8, 2, .8);
}

$title: 'This is title';
.post__title{
  content: quote($title);
}

example 10b.css

.post--big {
  width: 50%;
  font-size: 16px;
  background: rgba(231, 0, 2, 0.8);
}

.post__title {
  content: "This is title";
}