This interactive visualization maps Taiwan's counties, colored by a selected demographic or economic indicator from 2011 to 2021. Users can choose a metric via dropdown menus, triggering an animated bar chart that ranks counties alongside a national average line, while a line plot on the side tracks the temporal trend for the hovered county. The map is rendered using `d3.geoPath` on a TopoJSON topology, with choropleth coloring based on indicator values. The bar chart uses `d3.scaleBand` and `d3.scaleLinear` for layout, and the line plot uses `d3.line` with a gradient stroke that changes color based on yearly increases or decreases.