This example demonstrates how to build reusable chart components in D3.js v5 by wrapping SVG creation logic in a function that can be called on a selection, following the pattern from Pro D3.js. The page shows two containers where an array of three string values is bound to div elements, then each div uses `selection.call()` with a custom `chart2` function to append an SVG element with a white background rectangle. The code highlights the transition from earlier D3 versions, using `data()`, `enter()`, and `append()` to manage the enter selection, with the second example adding nested divs and SVG elements.