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diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg
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+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg
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+<svg xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ class="reftest-wait"
+ onload="
+ document.documentElement.pauseAnimations();
+ document.documentElement.setCurrentTime(0);
+ document.getElementById('b').setAttribute('begin', 'a.begin');
+ setTimeAndSnapshot(2, false)">
+ <script xlink:href="../smil-util.js" type="text/javascript"/>
+ <!--
+ Test of animation sandwich priority based on syncbase dependencies.
+
+ Test that we don't filter out a change to the timing model that does not
+ affect the start time of an interval but which DOES affect the dependency
+ chain.
+
+ Given the arrangement below, 'a' will have higher priority, as it is later
+ in the document. However, via script, we make 'b' dependent on 'a' giving
+ it a higher priority whilst preserving the interval times.
+ -->
+ <rect width="100" height="100" fill="orange">
+ <set attributeName="fill" to="green" begin="1s" id="b"/>
+ <set attributeName="fill" to="red" begin="1s" id="a"/>
+ </rect>
+</svg>