Practice
This example demonstrates a minimal React application that renders a static "Hello" heading while using D3 to update the text of a separate div element. It shows how to combine React for component-based UI with D3’s `select` function for direct DOM manipulation, alongside an imported ES6 module (`myMessage.js`) that supplies a text string. The code loads D3 v5 and React from CDNs and also imports the ReactDOM library to mount the React component into the root element. No data visualization or interactive behavior is present in this practice setup.