This example renders a single red heart symbol composed of two curved paths and a vertical line, drawn inside an SVG element. The heart is defined in a `<defs>` block and reused via an `<use>` tag with the `xlink:href` attribute. It demonstrates basic SVG styling, including a red fill and black stroke, and is accompanied by a small D3 script that imports the `select` function to set text content in a separate div, alongside a local ES6 module exporting the message.