defs.xml

<defs>
    <!--A filter used to deemphasize out of focus geometries for mouseover
       -effects.-->
    <!-- TODO: flood-color needs to be set from the current theme -->
    <filter id="panel-focus-filter" x="-20%" y="-20%" width="140%" height="140%">
        <feFlood flood-color="#f5f5f5" flood-opacity="0.5" result="flood">
            <animate id="panel-focus-filter-off-anim"
                      attributeName="flood-opacity" attributeType="XML"
                      fill="freeze" begin="indefinite" dur="0.2s"
                      from="0.8" to="0.0" onend="unpresent_geometry_end"/>
            <animate id="panel-focus-filter-on-anim"
                      attributeName="flood-opacity" attributeType="XML"
                      fill="freeze" begin="indefinite" dur="0.1s"
                      from="0.0" to="0.8" onend="unpresent_geometry_end"/>
        </feFlood>
        <feComposite operator="atop" in="flood" in2="SourceGraphic" />
    </filter>
</defs>