Hi, I'm not sure if this matters, but the plot code above does not reproduce the chart on the top. Here is the improved snippet Plot.barY(alphabet, { x: "letter", y: "frequency", sort: { x: "y", reverse: true } }).plot({ y: { tickFormat: "%" } })

True! Thanks for posting a more complete reproduction.

What would be the easiest way of altering const bar = svg.append("g") .attr("fill", color) to highlight a specific set of bars by changing the color ie. Vowels?