Disclaimer! Work In Progress! See source code. I recently read this wonderful blog post about using 17th Century Dutch fonts on the web. And, because I'm an idiot, I decided to try and build something similar using Shakespeare's first folio as a template. Now, before setting off on a journey, it is worth seeing if [...]
Both! Unicode has some support for as-is ligatures. For example
fi
is U+FB01.Modern fonts can also use self-defined ligatures. That’s how fonts like https://www.sansbullshitsans.com/
So my plan is (eventually) to add in ligatures where Unicode has defined them - and automatically replace typed text with self-defined ligatures where it doesn’t.