<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#named-timeline-range">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="support/testcommon.js"></script>
<script src="/web-animations/resources/keyframe-utils.js"></script>
<title>Animation range and delay</title>
</head>
<style type="text/css">
  @keyframes anim {
    cover 100% {
      margin-right: 0px;
    }
    cover 0% {
      margin-left:  0px;
    }
    50% {
      opacity:  0.5;
    }
  }
  #scroller {
    border:  10px solid lightgray;
    overflow-y: scroll;
    overflow-x: hidden;
    width: 300px;
    height: 200px;
  }
  #target {
    margin-bottom: 800px;
    margin-top:  800px;
    margin-left:  10px;
    margin-right:  10px;
    width: 100px;
    height: 100px;
    z-index: -1;
    background-color: green;
    animation:  anim auto both linear;
    /* using document timeline by default */
  }
</style>
<body>
  <div id="scroller">
    <div id="target"></div>
  </div>
</body>
<script type="text/javascript">
  async function runTest() {
    promise_test(async t => {
      await waitForNextFrame();
      const anim = document.getAnimations()[0];
      await anim.ready;
      await waitForNextFrame();

      // Using a document timeline, so only the 50% keyframe is used.
      let frames = anim.effect.getKeyframes();
      let expected = [
        { offset: 0, computedOffset: 0, opacity: "1", easing: "linear",
          composite: "replace" },
        { offset: 0.5, computedOffset: 0.5, opacity: "0.5", easing: "linear",
          composite: "auto" },
        { offset: 1, computedOffset: 1, opacity: "1", easing: "linear",
          composite: "replace" },
        { offset: { rangeName: "cover", offset: CSS.percent(100) },
          computedOffset: null, marginRight:  "0px", composite: "auto",
          easing: "linear" },
        { offset: { rangeName: "cover", offset: CSS.percent(0) },
          computedOffset: null, marginLeft:  "0px", composite: "auto",
          easing: "linear" }
      ];
      assert_frame_lists_equal(frames, expected);
    }, 'Keyframes with timeline-offsets reported but not reachable when ' +
       'using a document timeline');
  }

  window.onload = runTest;
</script>
