This example visualizes diabetes-related health metrics in a responsive scatter plot, mapping pregnancies on the x-axis, glucose levels on the y-axis, and varying symbol shapes based on skin thickness. It uses d3.scaleLinear, d3.scaleOrdinal, d3.axisLeft, d3.axisBottom, d3.symbols, and d3.symbol to generate SVG marks. The reusable chart function supports custom accessors, margins, and symbol size, drawing data from a CSV of diabetes records. The plot fills the browser window with hidden scrollbars and large axis tick text.