This interactive visualization displays the proportion of female athletes and medal winners across countries in selected Olympic years, with a dropdown menu to switch between historical periods such as 1912, 1936, and 2016. It uses D3 v6 with SVG rendering and animated transitions, scaling country bands vertically to accommodate the number of participating nations. The chart features a dumbbell plot comparing athlete and medal proportions, gridlines, a 50% reference line, and legends. Data comes from a CSV file hosted on GitHub, fetched via `d3.csv`, with axes and scales updated dynamically through the `update` function.