SVG Fundamentals
This example demonstrates basic SVG shapes by combining circles, rectangles, and lines in a fixed 960×500 canvas. It shows how circles vary in radius and fill color, rectangles use stroke and fill attributes, and lines connect coordinates with a specified stroke color. The code uses raw SVG elements—`<circle>`, `<rect>`, and `<line>`—without any JavaScript libraries, and renders directly in the browser via static markup.