This example demonstrates SVG fundamentals by rendering two overlapping circles and a thick navy line on a 960×500 canvas. The red and green circles are positioned at the same coordinates, with the smaller green circle layered on top of the larger red one, while the line spans the width of the viewport. The code uses plain SVG elements (`<circle>`, `<line>`) within an `<svg>` tag, with styling controlled via presentation attributes like `fill` and `stroke`.