<!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">
            <g style="opacity: 0.9;">
                <rect x="0" y="0" width="200" height="200" style="fill: green; mix-blend-mode: difference;"/>
            </g>
        </svg>
    </body>
</html>