This interactive scatter plot visualizes the relationship between maths and science marks from a CSV dataset, with two sequentially displayed SVG charts that alternate between circle and triangle/square symbols. The visualization shows student performance across two subjects, coloring points based on which subject score is higher. Built with D3 v7, the example uses `d3.scaleLinear` for axes, `d3.symbol()` with `d3.symbolTriangle` and `d3.symbolSquare` for custom point shapes, and `d3.csv()` for data loading. Both charts are initially hidden and displayed in sequence, each sharing identical axes, labels, and a legend indicating the comparison between maths and science scores.