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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 forwards;
animation-trigger: once 150px 200px;
}
.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="scroller" class="scroller">
<div id="space"></div>
<div id="deferred_subject" class="deferred subject"></div>
<div id="space"></div>
</div>
<div id="target" class="target"></div>
</div>
<script>
// 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) => {
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);
const animation = target.getAnimations()[0];
await waitForAnimationFrames(5);
// The animation is currently associated with the document timeline and
// would automatically run. Cancel it.
animation.cancel();
// Enter the trigger range. Since it is not yet associated with the
// view timeline, this should have no effect.
await rangeBoundaries.enterTriggerRange();
await waitForAnimationFrames(5);
// Now attach a view timeline. Since we are in the trigger range, we
// should trigger.
await testAnimationTrigger(test, async () => {
target.style.animationTriggerTimeline = "--viewtimeline";
await waitForAnimationFrames(5);
}, target, ["animationstart", "animationend", "animationcancel"],
[true, true, false]);
assert_equals(animation.playState, "finished",
"animation was run when its trigger was attached to a view " +
" timeline inside the trigger range.");
// TODO: Add a test which switches the timeline of the trigger.
}, "late-attached trigger timeline plays animation");
</script>
</body>
</html>
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