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
Tiempos
(Tiempos is a serif font designed by Kris Sowersby and released by Klim Type Foundry in 2010. The family includes four widths (normal, narrow, condensed, and compressed), each available in eight weights with matching italics)