<svg xmlns="http://www.w3.org/2000/svg">
    <desc>Test that the instance of the 'externalResourcesRequired' attribute is animated correctly.</desc>
    <def>
        <rect id="rect" width="100" height="100" fill="green">
            <set attributeName="externalResourcesRequired" to="true"/>
        </rect>
    </def>
    <use href="#rect"/>
</svg>