This SVG example demonstrates how to create a cubic chain path.

CubicChainPath.svg

<svg width="170" height="220" xmlns="http://www.w3.org/2000/svg">
    <path d="M0,100 C0,0 150,0 150,100
      S0,200 0,100" transform="translate(10,10)" 
      fill="none" stroke="black" stroke-width="1"/>
</svg>

Output