<!DOCTYPE html>
<title>animation-timeline with multiple timelines</title>
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-timeline">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
  main {
    timeline-scope: --top_timeline, --bottom_timeline, --left_timeline, --right_timeline;
  }

  .scroller {
    overflow: hidden;
    width: 100px;
    height: 100px;
  }
  .scroller > div {
    height: 200px;
    width:  200px;
  }

  @keyframes top {
    from { top: 100px; }
    to { top: 200px; }
  }
  @keyframes bottom {
    from { bottom: 100px; }
    to { bottom: 200px; }
  }
  @keyframes left {
    from { left: 100px; }
    to { left: 200px; }
  }
  @keyframes right {
    from { right: 100px; }
    to { right: 200px; }
  }

  #top_scroller {
    scroll-timeline-name: --top_timeline;
    scroll-timeline-axis: block;
  }
  #bottom_scroller {
    scroll-timeline-name: --bottom_timeline;
    scroll-timeline-axis: inline;
  }
  #left_scroller {
    scroll-timeline-name: --left_timeline;
    scroll-timeline-axis: block;
  }
  #right_scroller {
    scroll-timeline-name: --right_timeline;
    scroll-timeline-axis: inline;
  }

  #element {
    animation-name: top, bottom, left, right;
    animation-duration: 10s;
    animation-timing-function: linear;
    animation-timeline: --top_timeline, --bottom_timeline, --left_timeline, --right_timeline;
  }
  /* Ensure stable expectations if feature is not supported */
  @supports not (animation-timeline:--foo) {
    #element { animation-play-state: paused; }
  }
</style>
<main>
  <div class=scroller id=top_scroller><div></div></div>
  <div class=scroller id=bottom_scroller><div></div></div>
  <div class=scroller id=left_scroller><div></div></div>
  <div class=scroller id=right_scroller><div></div></div>
  <div id=element></div>
</main>
<script>
  promise_test(async (t) => {
    await runAndWaitForFrameUpdate(() => {
      top_scroller.scrollTop = 20;
      top_scroller.scrollLeft = 40;
      bottom_scroller.scrollTop = 20;
      bottom_scroller.scrollLeft = 40;
      left_scroller.scrollTop = 60;
      left_scroller.scrollLeft = 80;
      right_scroller.scrollTop = 60;
      right_scroller.scrollLeft = 80;
    });
    assert_equals(getComputedStyle(element).top, '120px');
    assert_equals(getComputedStyle(element).bottom, '140px');
    assert_equals(getComputedStyle(element).left, '160px');
    assert_equals(getComputedStyle(element).right, '180px');
  }, 'animation-timeline works with multiple timelines');
</script>
