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<!DOCTYPE html>
<html>
<head>
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-trigger">
<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 myAnim {
from { transform: scaleX(1); }
to { transform: scaleX(5); }
}
.subject, .target {
height: 50px;
width: 50px;
background-color: red;
}
.subject {
view-timeline: --viewtimeline;
}
.target {
animation: myAnim linear 0.5s forwards;
animation-trigger: once --viewtimeline 150px 200px;
}
.scroller {
overflow-y: scroll;
height: 500px;
width: 500px;
border: solid 1px;
position: relative;
}
#wrapper {
timeline-scope: --viewtimeline;
}
#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" class="target"></div>
</div>
<script>
target = document.getElementById("target");
function changePlayStateTo(state) {
target.style.animationPlayState = state;
}
// The trigger and exit ranges are the same for this test.
const CSS_TRIGGER_START_PX = 150;
const CSS_TRIGGER_END_PX = 200;
async function testPlayStateChange(test, rangeBoundaries) {
const initial_transform = getComputedStyle(target).transform;
// This enters the trigger range and should play the animation. Changing
// animation-play-state to "paused" should pause the animation, so we
// should not see an animationend event.
await testAnimationTrigger(test, async () => {
await rangeBoundaries.enterTriggerRange();
// Make a little progess.
await waitForAnimationFrames(5);
changePlayStateTo("paused");
}, target, ["animationstart", "animationend"], [true, false]);
await waitForAnimationFrames(5);
const partial_transform = getComputedStyle(target).transform;
assert_not_equals(partial_transform, initial_transform,
"animation made progress before pause.");
await waitForAnimationFrames(5);
assert_equals(getComputedStyle(target).transform, partial_transform,
"animation is paused and progress is not being made.");
await testAnimationTrigger(test, async () => {
await rangeBoundaries.exitExitRangeAbove();
await waitForAnimationFrames(5);
// check that exiting the exit range did not affect the animation.
assert_equals(getComputedStyle(target).transform, partial_transform,
"animation still paused after exiting the exit range.");
changePlayStateTo("running");
}, target, ["animationstart", "animationend"], [false, true]);
const final_transform = getComputedStyle(target).transform;
assert_not_equals(final_transform, initial_transform,
"animation is at the end, not the start");
assert_not_equals(final_transform, partial_transform,
"animation is at the end, beyond partial progress.");
}
promise_test(async (test) => {
scroller = document.getElementById("scroller");
target = document.getElementById("target");
const COVER_START_OFFSET = 100;
const rangeBoundaries = getRangeBoundariesForTest(
COVER_START_OFFSET + CSS_TRIGGER_START_PX,
COVER_START_OFFSET + CSS_TRIGGER_END_PX,
COVER_START_OFFSET + CSS_TRIGGER_START_PX,
COVER_START_OFFSET + CSS_TRIGGER_END_PX,
scroller);
await testPlayStateChange(test, rangeBoundaries);
}, "once trigger respects animation-play-state.");
</script>
</body>
</html>
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