<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="reftest-wait" onload="setTimeAndSnapshot(0.5, true)"> <script xlink:href="smil-util.js" type="text/javascript"/> <rect x="15" y="15" width="200" height="200" fill="blue" display="none"> <!-- The following animation is marked as additive even though the display property is not additive. We should basically behave as if the additive attribute were not specified and set display to 'block' after 0.5s. --> <animate attributeName="display" from="none" to="block" additive="sum" dur="1s" fill="freeze"/> </rect> </svg>