A minimalist SVG canvas is filled with a solid red background via D3.js, creating the base for a playful facial expression. The page uses D3 v5 to select the SVG element and apply a background color, with the `d3.select` API targeting the root `svg` node. The example demonstrates basic D3 styling and layout within a fixed 960-by-500-pixel viewport. No additional facial features are drawn beyond the red rectangle, leaving the image as a blank slate.