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<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
class="reftest-wait"
onload="setTimeAndSnapshot(1, true)">
<title>Test animation of the "preserveAlpha" <boolean> attribute on the "feConvolveMatrix" element</title>
<script xlink:href="smil-util.js" type="text/javascript"/>
<filter id="convolve_1">
<feConvolveMatrix order="2 2" kernelMatrix="0 0 0 0" preserveAlpha="true">
<!-- turn the referencing element from transparent to red at 1.25s -->
<animate attributeName="preserveAlpha"
calcMode="discrete"
begin="0s" dur="2.5s"
from="false" to="true"
fill="freeze"/>
</feConvolveMatrix>
<feColorMatrix type="matrix"
values="0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0"/>
</filter>
<filter id="convolve_2">
<feConvolveMatrix order="2 2" kernelMatrix="0 0 0 0" preserveAlpha="true">
<!-- turn the referencing element from red to transparent at 1s -->
<animate attributeName="preserveAlpha"
calcMode="discrete"
begin="0s" dur="2s"
from="true" to="false"
fill="freeze"/>
</feConvolveMatrix>
<feColorMatrix type="matrix"
values="0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0"/>
</filter>
<rect width="100%" height="100%" fill="lime"/>
<!-- 40% through discrete animation simple duration -
tests that the animation doesn't affect the element too early -->
<rect width="100" height="50" fill="red" filter="url(#convolve_1)"/>
<!-- 50% through discrete animation simple duration -
tests that the animation affects the element now -->
<rect y="50" width="100" height="50" fill="red" filter="url(#convolve_2)"/>
</svg>
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