This interactive scatterplot visualizes a dataset of Spotify tracks, plotting pairs of audio features such as acousticness, energy, and valence on x- and y-axes. Users select features from two dropdown menus, and the visualization updates the axes and data points accordingly. Rendered as an SVG using D3.js version 5, the chart uses `d3.scaleLinear` for both axes and draws semi-transparent circles to indicate track distributions. The code reads from a local CSV file and updates the chart dynamically via a polling function that checks selector changes.