<!doctype html>
<html class="reftest-wait">
<head>
<title>
Bug 1216842: effect-level easing function produces negative values passed
to step-end function (compositor thread)
</title>
<style>
#target {
width: 100px; height: 100px;
background: blue;
}
</style>
</head>
<body>
<div id="target"></div>
</body>
<script>
var target = document.getElementById("target");
var effect =
new KeyframeEffectReadOnly(
target,
{ opacity: [0, 1], easing: "step-end" },
{
fill: "forwards",
/* The function produces negative values in (0, 0.766312060) */
easing: "cubic-bezier(0,-0.5,1,-0.5)",
duration: 100,
iterations: 0.75 /* To finish in the extraporation range */
}
);
var animation = new Animation(effect, document.timeline);
animation.play();
animation.finished.then(function() {
document.documentElement.className = "";
});
</script>
</html>