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<!DOCTYPE html>
<meta charset="utf-8">
<title>View timeline on element with display:none</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-timelines">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="/scroll-animations/view-timelines/testcommon.js"></script>
<script src="/css/css-typed-om/resources/testhelper.js"></script>
<style>
#container {
border: 10px solid lightgray;
overflow-x: scroll;
height: 200px;
width: 200px;
}
#content {
display: flex;
flex-flow: row nowrap;
justify-content: flex-start;
width: 1800px;
margin: 0;
}
.spacer {
width: 800px;
display: inline-block;
}
#target {
background-color: green;
height: 100px;
width: 100px;
display: none;
}
</style>
<div id="container">
<div id="content">
<div class="spacer"></div>
<div id="target"></div>
<div class="spacer"></div>
</div>
</div>
<script>
promise_test(async t => {
const timeline = new ViewTimeline({ subject: target });
const anim = target.animate({ opacity: [0, 0.5] }, { timeline: timeline });
t.add_cleanup(() => {
anim.cancel();
});
anim.rangeStart = "1em";
container.scrollLeft = 750;
await waitForNextFrame();
assert_equals(getComputedStyle(target).opacity, "1",
"Opacity with inactive timeline");
}, "element with display: none should have inactive viewtimeline");
</script>
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