Examples of websites using
Knockout
(Knockout is a sans-serif font designed by Jonathan Hoefler and released by Hoefler&Co. The font is available in multiple styles, including heavyweight, medium, thin, and ultra-thin, each with a distinctive geometric aesthetic)
with
IBM Plex Sans
(IBM Plex Sans is a Sans Serif font designed by Mike Abbink of Bold Monday. The font family consists of multiple styles and variations, including regular and italics, and is available in a range of weights)