<!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>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<title>Animation range updates play state</title>
</head>
<style type="text/css">
  @keyframes anim {
    from { background-color:  blue; }
    to { background-color:  white; }
  }
  #scroller {
    border:  10px solid lightgray;
    overflow-y: scroll;
    overflow-x: hidden;
    width: 300px;
    height: 200px;
  }
  #target {
    margin-top:  800px;
    margin-bottom: 800px;
    margin-left:  10px;
    margin-right:  10px;
    width: 100px;
    height: 100px;
    z-index: -1;
    background-color: green;
    animation:  anim auto linear;
    animation-timeline:  --t1;
    view-timeline:  --t1;
  }
</style>
<body>
  <div id="scroller">
    <div id="target"></div>
  </div>
</body>
<script type="text/javascript">
  async function runTest() {
    promise_test(async t => {
      const anim = target.getAnimations()[0];
      await anim.ready;

      let duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(duration, CSS.percent(100),
                            'Default duration is 100%');

      // Start and end boundaries coincide.
      anim.rangeStart = "entry 100%";
      anim.rangeEnd = "contain 0%";
      duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(duration, CSS.percent(0),
                            "Duration is zero when boundaries coincide");

      // Start > end, clamp at zero duration.
      anim.rangeEnd = "entry 0%"
      duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(duration, CSS.percent(0),
                            "Duration is zero when start > end");

      anim.rangeStart = "normal";
      anim.rangeEnd = "normal";
      duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(duration, CSS.percent(100),
                            "Duration is 100% after range reset");

      // Consumed 100% of timeline duration with delays
      anim.effect.updateTiming({
        delay: CSS.percent(60),
        endDelay: CSS.percent(40)
      });
      duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(duration, CSS.percent(0),
                            "Duration is 0% after delays sum to 100%");

      // Delays sum to > 100%
      anim.effect.updateTiming({
        delay: CSS.percent(60),
        endDelay: CSS.percent(60)
      });
      duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(duration, CSS.percent(0),
                            "Duration is 0% after delays sum to > 100%");

      anim.effect.updateTiming({
        delay: CSS.percent(40),
        endDelay: CSS.percent(40)
      });
      duration = anim.effect.getComputedTiming().duration;
      assert_percents_equal(
          duration, CSS.percent(20),
          "Duration is 20% if normal range and delays sum to 80%");

    }, 'Intrinsic iteration duration is non-negative');
  }


  window.onload = runTest;
</script>
