alt Hacker News> That's only a problem with some sans-serif fonts. This very site is using a sans-serif and the capital 'I' has bars in either end so it's not confused with 'l'.
I'm not sure if my browser is broken or what but they literally look identical to me in your comment.
font-family: Verdana, Geneva, sans-serif;
My computer has neither Verdana nor Geneva, and my browser's default sans-serif is Noto Sans, which has bars on the upper case "I".
Verdana does, too. It looks like Geneva does not (<http://www.identifont.com/show?1O3>), so you're probably using Geneva.
Maybe Verdana is the default for Windows, Geneva for MacOS, and "other" for Linuxes.