<svg xmlns="http://www.w3.org/2000/svg">
<!-- Renderes should be created for all elements in the fO subtree -->
<foreignObject width="300" height="100">
    <svg xmlns="http://www.w3.org/2000/svg">
        <g><text y="20">crash</text></g>
    </svg>
</foreignObject>

<foreignObject y="50" width="300" height="100">
    <svg xmlns="http://www.w3.org/2000/svg">
        <rect fill="green" width="100" height="100"/>
    </svg>
</foreignObject>

<foreignObject y="150" width="300" height="100">
    <!-- This is in SVG namespace, as it's inherited from the top svg element -->
    <svg>
        <rect fill="green" width="100" height="100"/>
    </svg>
</foreignObject>
</svg>