This bubble chart visualizes the correlation between heart rate, systolic blood pressure, and age, with point size encoding age and color encoding risk level. Built with D3 v7, it renders as an SVG with tooltips on hover, while a legend displays age-to-size mapping. The chart uses d3.scaleLinear for axes and bubble sizing, plus d3.scaleOrdinal with interpolateTurbo for categorical colors, reading data from bubblechart.csv.