This example demonstrates a before-and-after image comparison slider with a draggable white divider. The interface lets users interactively reveal one of two photographs by dragging the resizer horizontally across the container. The implementation relies on plain JavaScript event listeners for mouse and touch interactions, manipulating DOM element widths and positions directly. It uses CSS gradients and flexbox for styling, with images sourced from Pexels, and does not utilize any D3 or React APIs despite the title.