Fork of D3 Transitions
This example animates the entry, update, and exit of six colored circles defined by explicit position, radius, and fill data. It first shows the circles growing from a radius of zero during a slow two-second transition with staggered delays, then demonstrates faster linear updates and intermediate exits. The rendering is achieved using D3’s data join operators (`select`, `selectAll`, `data`, `join`) to manage entering, updating, and exiting SVG circle elements. Transitions are specified with D3’s `transition` API, including custom durations and easing functions from `d3.easeLinear`.