Fork of D3 Transitions
A collection of six colored circles, each with a distinct radius and position, appears sequentially on a pale green background, then subsequent updates smoothly relocate them. The visualization demonstrates D3's data join and transition system, using `d3.transition`, `easeLinear`, and a custom transition duration to animate the enter, update, and exit states. The enter animation grows each circle from a radius of zero with a staggered delay, while the update state animates positional changes and the exit shrinks the circle back to zero before removal. The code works with SVG circle elements and applies a fixed opacity.