Scatter Plot with Menus
This scatter plot visualizes the Auto MPG dataset from the UCI Machine Learning Repository, displaying car attributes as red, semi-transparent circles. Users select which columns map to the X and Y axes via dropdown menus, built with a reusable `dropdownMenu` D3 module. The visualization uses d3.csv for data loading, d3.scaleLinear for axis scaling, and d3.axisBottom/axisLeft for gridlines, with animated circle transitions via d3.transition. Each axis label updates to reflect the selected column, and the plot re-renders on user interaction.