I came across a web page the other day that uses ligatures, something I’ve not seen before (or more likely have seen before and have forgotten Being that sort of chap, I thought I’d try playing with ligatures myself. But I’m not having any luck. I’ve used the same font stack. I have this pen
Well, in typography ligatures usually look better in serif fonts (meant to write) not sans-serif. In CSS that also appears to be the case. I would also suspect certain serif fonts work better than others.