{"version":"1.0","type":"rich","title":"Fork of Selecting a Year on a Line Chart","description":"This visualization shows regional population trends over time as multi-line chart, with a vertical line marking the currently selected year. Moving the mouse across the chart updates the selected year, and a legend identifies each region's color. The code uses D3 v5 APIs including `d3.nest`, `d3.scaleOrdinal` with `schemeCategory10`, and `d3.line` with `curveBasis`, while the interactive year selection relies on `d3.mouse` and `scaleTime.invert`. Data comes from UN population estimates and medium variant projections, rendered as SVG elements.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/9e68e582b017404c938ed3f1137ce18a?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}