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
Aperçu
(Aperçu is a sans-serif font designed by Colophon Foundry and released by Commercial Type. The family is available in multiple weights and styles, including regular, condensed, and extended widths, with matching italics)