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Test Info:

<!doctype html>
<html class="reftest-wait">
<head>
<title>Bug 1216842: effect-level easing function produces values greater than 1 (main-thread)</title>
</head>
<body>
<div id="target"></div>
</body>
<script>
var target = document.getElementById("target");
var effect =
new KeyframeEffect(
target,
{ color: ["red", "blue"] },
{
fill: "forwards",
/* The function produces values greater than 1 in (0.23368794, 1) */
easing: "cubic-bezier(0,1.5,1,1.5)",
duration: 100
}
);
var animation = new Animation(effect, document.timeline);
animation.pause();
animation.currentTime = 250;
document.documentElement.className = "";
</script>
</html>