Curious about the design behind d3js.org? SiteFontCheck scanned their live CSS architecture and identified 1 unique font family. The website relies heavily on <-apple-system, blinkmacsystemfont, avenir next, avenir, helvetica, helvetica neue, ubuntu, roboto, noto, segoe ui, arial, sans-serif> across its main text elements. Below is the precise map of font sizes, weights, and text elements used across their site.