<!DOCTYPE html>
<html id="top">
<meta charset="utf-8">
<title>View timeline current-time with vertical-rl writing mode</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#viewtimeline-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="/scroll-animations/view-timelines/testcommon.js"></script>
<style>
  #container {
    writing-mode: vertical-rl;
    overflow-x: scroll;
    height:  200px;
    width: 200px;
  }
  .spacer {
    width:  800px;
  }
  #target {
    background-color:  green;
    height:  100px;
    width:  200px;
  }
</style>
<body>
  <div id="container">
    <div id="leading-space" class="spacer"></div>
    <div id="target"></div>
    <div id="trailing-space" class="spacer"></div>
  </div>
</body>
<script type="text/javascript">
  promise_test(async t => {
    container.scrollLeft = 0;
    await waitForNextFrame();

    const anim = CreateViewTimelineOpacityAnimation(t, target, {axis: 'block'});
    const timeline = anim.timeline;
    await anim.ready;

    // Initially before start-offset and animation effect is in the before
    // phase.
    assert_percents_equal(timeline.currentTime, -150,
                          "Timeline's currentTime at container start boundary");
    assert_percents_equal(anim.currentTime, -150,
                          "Animation's currentTime at container start boundary");
    assert_equals(getComputedStyle(target).opacity, "1",
                  'Effect is inactive in the before phase');

    // Advance to the start offset, which triggers entry to the active phase.
    container.scrollLeft = -600;
    await waitForNextFrame();
    assert_percents_equal(timeline.currentTime, 0,
                          "Timeline's current time at start offset");
    assert_percents_equal(anim.currentTime, 0,
                          "Animation's current time at start offset");
    assert_equals(getComputedStyle(target).opacity, '0.3',
                  'Effect at the start of the active phase');

    // Advance to the midpoint of the animation.
    container.scrollLeft = -800;
    await waitForNextFrame();
    assert_percents_equal(timeline.currentTime, 50,
                          "Timeline's currentTime at midpoint");
    assert_percents_equal(anim.currentTime, 50,
                          "Animation's currentTime at midpoint");
    assert_equals(getComputedStyle(target).opacity,'0.5',
                  'Effect at the midpoint of the active range');

    // Advance to the end of the animation.
    container.scrollLeft = -1000;
    anim.effect.updateTiming({ fill: 'forwards' });
    await waitForNextFrame();
    assert_percents_equal(timeline.currentTime, 100,
                          "Timeline's currentTime at end offset");
    assert_percents_equal(anim.currentTime, 100,
                          "Animation's currentTime at end offset");
    assert_equals(getComputedStyle(target).opacity, '0.7',
                  'Opacity with fill forwards at effect end time');
    anim.effect.updateTiming({ fill: 'none' });
    assert_equals(getComputedStyle(target).opacity, '1',
                  'Opacity with fill none at effect end time');

    // Advance to the scroll limit.
    container.scrollLeft = -1600;
    await waitForNextFrame();
    assert_percents_equal(timeline.currentTime, 250,
                          "Timeline's currentTime at scroll limit");
    // Hold time set when the animation finishes, which clamps the value of
    // the animation's currentTime.
    assert_percents_equal(anim.currentTime, 100,
                          "Animation's currentTime at scroll limit");
    // In the after phase, so the effect should not be applied.
    assert_equals(getComputedStyle(target).opacity, '1',
                  'After phase at scroll limit');
  }, 'View timeline with container having vertical-rl layout' );

</script>
</html>
