Tangential question: what was used to produce those charts? I love the simple formatting and how the data is laid out. My company* uses ggplot exclusively for

Tangential question: what was used to produce those charts? I love the simple formatting and how the data is laid out. My company* uses ggplot exclusively for reports that don't look nearly this well done. I love the information density, love the use of colors, love everything about them! Based on my inspection of the source, these are "native html" charts in the sense that it's a mix of text and svg rect elements — not an "image" that is included. Does anyone know how these are produced? I would love to shamelessly imitate if possible. *tiny market research firm