This example displays a horizontal bar chart of letter frequencies in the English alphabet, with bars sorted in descending order and rendered in steelblue. The visualization uses D3 v7’s `select` and a `BarChart` function to map frequency values to the x-axis and letters to the y-axis. Data is ordered via `d3.groupSort` based on descending frequency, and the x-axis is formatted as a percentage. The chart is embedded directly in an HTML page with large body text and relies on D3’s bundled modules for rendering.