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<!DOCTYPE html>
<html>
<head>
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#trigger-scope">
<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>
<script src="support/trigger-scope-support.js"></script>
</head>
<body>
<style>
@keyframes expand {
from { transform: scaleX(1) }
to { transform: scaleX(2) }
}
#scroller {
overflow-y: scroll;
height: 200px;
width: 200px;
border: solid 1px;
trigger-scope: all;
display: block;
}
#source {
top: 100%;
height: 100px;
width: 100px;
background-color: blue;
timeline-trigger: --trigger view() contain;
}
.target {
background-color: red;
height: 100px;
width: 100px;
animation: expand linear 1s both;
animation-trigger: --trigger play-forwards play-backwards;
}
#in_scope_target {
/* Let's it be in view when the trigger source comes into view */
margin-top: 50%;
}
.long {
width: 50%;
height: 100%;
}
</style>
<div id="scroller">
<div id="in_scope_target" class="target">In-scope Target</div>
<div id="source">SOURCE</div>
<div class="long"></div>
<div class="long"></div>
</div>
<div id="out_of_scope_target" class="target">
Out-of-scope Target
</div>
<script>
promise_test(async() => {
const in_scope_target = document.getElementById("in_scope_target");
// The in-scope target should be attached to the trigger and paused at
// time 0.
assert_element_animation_state(in_scope_target, "paused");
// The out-of-scope target should be paused at time 0, waiting for its
// trigger.
assert_element_animation_state(out_of_scope_target, "paused");
// Perform a scroll that triggers the animation.
await runAndWaitForFrameUpdate(() => {
source.scrollIntoView({block: "center"});
});
assert_greater_than(scroller.scrollTop, 0, "did scroll");
// The in-scope target should now be playing as the trigger condition
// has been met.
assert_element_animation_state(in_scope_target, "running");
// There should be no change to the out-of-scope target.
assert_element_animation_state(out_of_scope_target, "paused");
}, "In-scope target finds trigger of source; out-of-scope " +
"target does not.");
</script>
</body>
</html>
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