This example demonstrates an interactive image-mapping tool built with React and D3 v7, allowing users to draw rectangular regions over a base map image. Users create selections by dragging the mouse on an SVG canvas, then attach URLs to each marked rectangle via a prompt. The interface includes a list of all selections with edit capabilities, where coordinates and dimensions can be modified or items deleted through a dialog. The implementation uses D3's event handling for mouse interactions, SVG `rect` elements with red transparent styling, and DOM manipulation to update the selection list dynamically.