<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 400 400">
    <title>There should be a single blue quarter-circle and a single green square.</title>
    <defs>
        <filter id="image">
            <feImage xlink:href="#circle" />
        </filter>
        <filter id="flood">
            <feFlood flood-color="green" />
        </filter>
        <circle id="circle" r="100" fill="blue" />
    </defs>
    <rect x="0" y="0" width="100" height="100" filter="url(#image)" />
    <rect x="100" y="100" width="100" height="100" filter="url(#flood)" />
</svg>