This example demonstrates how to build a simple interactive counter using standard UI elements with D3. It shows a button and a text display that updates the click count in real time. The implementation uses D3 selections to create the button and counter div, with event handling via the `on` method to update application state. The `state` object manages the count, and `setState` triggers re-rendering. The code leverages D3's data join pattern with `selectAll` and `join` to bind elements. Styling is handled through CSS classes defined in `styles.css`, using Flexbox for centered layout and green button styling.