Some weeks ago, while developing a custom typeface for a client, I was asked about adjusting the position and thickness of the underlines and strikethroughs. I knew it was possible to customize these values in Glyphs, Fontlab or any other font editor. But honestly, I didn’t usually bother to configure them because I knew they weren’t really enforced by most graphic software. This was a custom project, so fine-tuned underlines and strikethroughs could potentially save my client from a few headaches when typesetting documents. With that in mind, I decided to investigate further.