<!DOCTYPE html>
<body>
<svg width="300" height="300">
    <rect x="20" y="20" width="100" height="100" fill="rgb(0,255,255)"/>
    <rect x="140" y="20" width="100" height="100" fill="rgb(255,0,255)"/>
    <rect x="20" y="140" width="100" height="100" fill="rgb(255,255,0)"/>
    <rect x="140" y="140" width="100" height="100" fill="rgb(0,0,0)"/>
</svg>
</body>