One Slider Affecting Two Charts
This example shows two identical bar charts displaying capital gains by sector, with a slider that selects a date to update both charts simultaneously. The code uses D3 v7 to parse CSV data, nest it by date, and render SVG bar charts with axes. A range input controls the selected date, triggering the `updateCharts` function to rebuild both charts with new data. The visualization demonstrates how a single UI control can synchronize multiple views of a dataset.