<!DOCTYPE HTML>
<html>
    <body>
        <p>The test passes if you see a green square.</p>
        <svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="200px" height="200px">
            <defs>
                <filter id="Blur" 
                    filterUnits="userSpaceOnUse" x="0" y="0" width="200" height="200">
                    <feGaussianBlur stdDeviation="8" />
                </filter>
            </defs>
            <g id="isolator" filter="url(#Blur)">
                <rect x="0" y="0" width="200" height="200" style="fill: green;"/>
            </g>
        </svg>
    </body>
</html>