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<!doctype html>
<html class="reftest-wait">
  <head>
    <title>
      Bug 1216842: effect-level easing function produces values greater than 1
      which are 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 KeyframeEffect(
        target,
        { opacity: [0, 1], easing: "step-end" },
        {
          fill: "forwards",
          /* The function produces values greater than 1 in (0.23368794, 1) */
          easing: "cubic-bezier(0,1.5,1,1.5)",
          duration: 100,
          iterations: 0.25 /* To finish in the extraporation range */
        }
      );
    var animation = new Animation(effect, document.timeline);
    animation.play();
    animation.finished.then(function() {
      document.documentElement.className = "";
    });
  </script>
</html>