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diff --git a/dom/animation/test/crashtests/1604500-1.html b/dom/animation/test/crashtests/1604500-1.html
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+<!doctype html>
+<html>
+<head>
+<script>
+function start () {
+ const keyframe = new KeyframeEffect(undefined, {});
+ const animation = new Animation(keyframe, undefined);
+ // Make animation run backwards...
+ animation.playbackRate = -100;
+ // But then set the current time to the future so it becomes "current"...
+ animation.currentTime = 2055;
+ // After updating the playback rate to zero, however, it should no longer
+ // be "current" (and this takes effect immediately because |animation| is
+ // paused)...
+ animation.updatePlaybackRate(0);
+ // Now update the target and hope nothing goes wrong...
+ keyframe.target = div;
+}
+
+document.addEventListener('DOMContentLoaded', start)
+</script>
+</head>
+<div id=div></div>
+</html>