This example shows an interactive bar chart of a small dataset where dragging a vertical HTML range slider recolors bars below a threshold value from light blue to dark blue. The chart uses D3 version 7 scales (`scaleBand` and `scaleLinear`) to position and size SVG rectangles, and React is mentioned as the framework context. The slider’s `change` event triggers a D3 transition over 500 milliseconds to animate the fill color change, demonstrating linked interaction between an HTML input and D3-managed SVG elements.