<svg xmlns="http://www.w3.org/2000/svg">
    <style>
        #ellipse-1 { ry: 20px; }
        #ellipse-2 { rx: 30px; }
        #ellipse-3 { ry: 40px; }
        #ellipse-4 { rx: 50px; }
    </style>
    <ellipse id="ellipse-1" cx="40" cy="60" rx="20" fill="green"/>
    <ellipse id="ellipse-2" cx="90" cy="60" ry="30" fill="green"/>

    <ellipse id="ellipse-3" cx="160" cy="60" rx="20" fill="green">
        <animate attributeType="XML" attributeName="rx" from="20" to="40" dur="1s" fill="freeze"/>
    </ellipse>

    <ellipse id="ellipse-4" cx="250" cy="60" ry="20" fill="green">
        <animate attributeType="XML" attributeName="ry" from="20" to="50" dur="1s" fill="freeze"/>
    </ellipse>

    <use y="100" href="#ellipse-1"/>
    <use y="100" href="#ellipse-2"/>
    <use y="100" href="#ellipse-3"/>
    <use y="100" href="#ellipse-4"/>

    <script>
        if (window.testRunner)
            testRunner.waitUntilDone();

        window.addEventListener('load', (event) => {
            document.documentElement.setCurrentTime(5);
            if (window.testRunner)
                testRunner.notifyDone();
        });
    </script>
</svg>