Face with D3 js
This example renders a red square as an SVG face, using a static `d3.select` call to target the top-level `<svg>` element and apply the background color. The SVG canvas is 500 by 500 pixels, with a CSS class defining black lines of width 5, though no paths are drawn. The code loads D3 v5 from the unpkg CDN and demonstrates a minimal setup for styling an SVG container, with the red background set via D3's selection style method.