Shapes and Colors with SVG and CSS
This example shows a simple face made of SVG shapes, with a yellow circle for the head, black circles for eyes, and an arc-based path for the mouth. It uses D3 v5 selections and the `arc` generator to draw the mouth, while CSS sets the page background and removes margins. The SVG canvas is 500 by 500 pixels, and shapes are styled with inline fill and stroke attributes.