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Test Info: Warnings
- This test has a WPT meta file that expects 2 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /scroll-animations/animation-trigger/animation-trigger-play-forwards-backwards.tentative.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="support/support.js"></script>
</head>
<body>
<style>
@keyframes expand {
from { transform: scaleX(1); }
to { transform: scaleX(5); }
}
.subject, .target {
height: 50px;
width: 50px;
background-color: red;
}
.target {
animation: expand linear 10s both;
}
#target_forwards {
animation-trigger: --trigger play-forwards;
}
#target_backwards {
animation-trigger: --trigger play-backwards;
}
#subject {
timeline-trigger: --trigger view() 150px 200px;
}
.scroller {
overflow-y: scroll;
height: 500px;
width: 500px;
border: solid 1px;
position: relative;
}
#space {
width: 50px;
height: 600px;
}
</style>
<div id="wrapper">
<div id="scroller" class="scroller">
<div id="space"></div>
<div id="subject" class="subject"></div>
<div id="space"></div>
</div>
<div id="target_forwards" class="target"></div>
<div id="target_backwards" class="target"></div>
</div>
<script>
const CSS_ANIMATION_DURATION = 10000;
const COVER_START_OFFSET = 100;
const CSS_TRIGGER_START_PX = 150;
const CSS_TRIGGER_END_PX = 200;
const ACTIVATION_RANGE_START_PX = COVER_START_OFFSET + CSS_TRIGGER_START_PX;
const ACTIVATION_RANGE_END_PX = COVER_START_OFFSET + CSS_TRIGGER_END_PX;
const enter = () => {
return runAndWaitForFrameUpdate(async () => {
scroller.scrollTop =
(ACTIVATION_RANGE_START_PX + ACTIVATION_RANGE_END_PX) / 2;
}).then(waitForCompositorCommit);
}
const exit = () => {
return runAndWaitForFrameUpdate(async () => {
scroller.scrollTop = ACTIVATION_RANGE_END_PX + 100;
}).then(waitForCompositorCommit);
}
const reset = (target) => {
const animation = target.getAnimations()[0];
animation.pause();
animation.playbackRate = 1;
animation.currentTime = 0;
scroller.scrollTop = 0;
}
promise_test(async (test) => {
const target = document.getElementById("target_forwards");
reset(target);
const animation = target.getAnimations()[0];
// Setup finished at start (playbackRate = -1, finished -> currentTime = 0).
animation.playbackRate = -1;
animation.finish();
assert_equals(animation.playState, "finished",
"initially finished at start");
assert_times_equal(animation.currentTime, 0);
// Enter to trigger play-forwards. Should change playbackRate to 1 and play.
await enter();
assert_equals(animation.playState, "running",
"should start running forwards");
assert_equals(animation.playbackRate, 1,
"playbackRate should be reversed to positive");
assert_greater_than_equal(animation.currentTime, 0,
"currentTime should progress");
// Manually finish it in the forwards direction (finished at end,
// playbackRate = 1).
animation.finish();
assert_equals(animation.playState, "finished", "finished at end");
assert_times_equal(animation.currentTime, CSS_ANIMATION_DURATION);
// Exit and re-enter. Should NOT restart.
await exit();
await enter();
await waitForAnimationFrames(2);
assert_equals(animation.playState, "finished",
"should not restart after re-enter");
assert_times_equal(animation.currentTime, CSS_ANIMATION_DURATION);
assert_equals(animation.playbackRate, 1);
}, "play-forwards plays a finished animation if reversing direction, "
+ "and does not restart it once finished");
promise_test(async (test) => {
const target = document.getElementById("target_backwards");
reset(target);
const animation = target.getAnimations()[0];
// Manually finish it (finished at end, playbackRate = 1).
animation.finish();
assert_equals(animation.playState, "finished",
"initially finished at end");
assert_times_equal(animation.currentTime, CSS_ANIMATION_DURATION);
// Enter to trigger play-backwards. Should change playbackRate to -1 and play.
await enter();
assert_equals(animation.playState, "running",
"should start running backwards");
assert_equals(animation.playbackRate, -1,
"playbackRate should be reversed to negative");
assert_less_than_equal(animation.currentTime, CSS_ANIMATION_DURATION,
"currentTime should progress backwards");
// Manually finish it in the backwards direction (finished at start,
// playbackRate = -1).
animation.finish();
assert_equals(animation.playState, "finished", "finished at start");
assert_times_equal(animation.currentTime, 0);
// Exit and re-enter. Should NOT restart.
await exit();
await enter();
await waitForAnimationFrames(2);
assert_equals(animation.playState, "finished",
"should not restart after re-enter");
assert_times_equal(animation.currentTime, 0);
assert_equals(animation.playbackRate, -1);
}, "play-backwards plays a finished animation if reversing direction, "
+ "and does not restart it once finished");
</script>
</body>
</html>