CSS makes it easy to highlight special links across your entire site. For instance, many of our sites indicate when a link points to a PDF or external website by labeling it with a special icon.
In the bad old days, web developers added “(PDF)” to each and every PDF link in your site by hand. This is doable but tedious, especially if someone else is making changes to the site after you’ve finished building it. This is where CSS generated content comes in handy.