Curious about the design behind treas.gov? SiteFontCheck scanned their live CSS architecture and identified 7 unique font families. The website relies heavily on <source sans pro web, helvetica, arial, sans-serif> for its main text elements, paired with <source sans pro, calibri, sans-serif> and <source sans pro, open sans, sans-serif> as fallback options, and 4 additional. Below is the precise map of font sizes, weights, and text elements used across their site.