A bar chart displays a dataset of 20 values, initially rendered in blue. Clicking a text prompt triggers a 2-second transition where the bars' heights, positions, and labels animate to a new dataset. The animation uses `d3.transition()` with `.duration(2000)` and `.ease(d3.easeLinear)`, demonstrating linear easing. The SVG elements are created programmatically, with bar positions scaled via `d3.scaleBand()` and `d3.scaleLinear()`, and label positions updated alongside the rectangles.