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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;
}
.target {
animation: myAnim linear 0.5s both;
animation-trigger: alternate;
animation-trigger-range: 150px 200px;
}
.scroll {
animation-trigger-timeline: scroll();
}
.view {
animation-trigger-timeline: view();
}
.deferred {
animation-trigger-timeline: --viewtimeline;
}
.deferred.subject {
view-timeline: --viewtimeline;
}
.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="scroll_scroller" class="scroller">
<div id="space"></div>
<div id="scroll_target" class="scroll subject target" tabindex="0"></div>
<div id="space"></div>
</div>
<div id="view_scroller" class="scroller">
<div id="space"></div>
<div id="view_target" class="view subject target" tabindex="0"></div>
<div id="space"></div>
</div>
<div id="deferred_scroller" class="scroller">
<div id="space"></div>
<div id="deferred_subject" class="deferred subject" tabindex="0"></div>
<div id="space"></div>
</div>
<div id="deferred_target" class="deferred target" tabindex="0"></div>
</div>
<script>
async function testAlternateAnimationTrigger(test, rangeBoundaries) {
// Just short of the trigger range start, no trigger action expected.
await testAnimationTrigger(test, () => {
return rangeBoundaries.exitTriggerRangeAbove();
}, target, ["animationstart", "animationend"], [false, false]);
// This skips the trigger range and should not play the animation.
await testAnimationTrigger(test, () => {
return rangeBoundaries.exitTriggerRangeBelow();
}, target, ["animationstart", "animationend"], [false, false]);
const initial_transform = getComputedStyle(target).transform;
// This enters the trigger range and should play the animation.
await testAnimationTrigger(test, () => {
return rangeBoundaries.enterTriggerRange();
}, target, ["animationstart", "animationend"], [true, true]);
const final_transform = getComputedStyle(target).transform;
// This is an alternate trigger, exiting the exit range reverses the
// animation.
await testAnimationTrigger(test, () => {
return rangeBoundaries.exitExitRangeAbove();
}, target, ["animationstart", "animationend", "animationcancel"],
[true, true, false]);
assert_equals(getComputedStyle(target).transform, initial_transform,
"animation reversed after reaching end");
// This is an alternate trigger, re-entering plays the animation.
await testAnimationTrigger(test, async () => {
// Enter the range.
await rangeBoundaries.enterTriggerRange();
await waitForAnimationFrames(5);
// Expect some but not all progress.
const current_transform = getComputedStyle(target).transform;
assert_not_equals(current_transform, initial_transform);
assert_not_equals(current_transform, final_transform);
// Exit the range.
return rangeBoundaries.exitExitRangeBelow();
}, target,
["animationstart", "animationend", "animationcancel"],
[true, true, false]);
assert_equals(getComputedStyle(target).transform, initial_transform,
"animation reverse mid-animation");
}
// The trigger and exit ranges are the same for this test.
const CSS_TRIGGER_START_PX = 150;
const CSS_TRIGGER_END_PX = 200;
promise_test(async (test) => {
scroller = scroll_scroller;
target = scroll_target;
const rangeBoundaries = getRangeBoundariesForTest(CSS_TRIGGER_START_PX,
CSS_TRIGGER_END_PX,
CSS_TRIGGER_START_PX,
CSS_TRIGGER_END_PX,
scroller);
await testAlternateAnimationTrigger(test, rangeBoundaries);
}, "once animation triggered via scroll() timeline.");
promise_test(async (test) => {
scroller = view_scroller;
target = view_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 testAlternateAnimationTrigger(test, rangeBoundaries);
}, "once animation triggered via view() timeline.");
promise_test(async (test) => {
scroller = deferred_scroller;
target = deferred_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 testAlternateAnimationTrigger(test, rangeBoundaries);
}, "once animation triggered via deferred (view) timeline.");
</script>
</body>
</html>
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