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<!DOCTYPE html>
<title>Node.moveBefore should preserve CSS animation state (left)</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<section id="old-parent">
<div id="item"></div>
</section>
<section id="new-parent">
</section>
<style>
@keyframes anim {
from {
left: 100px;
}
to {
left: 400px;
}
}
section {
position: absolute;
}
#item {
position: relative;
width: 100px;
height: 100px;
background: green;
animation: 1s linear infinite alternate anim;
animation-delay: 100ms;
}
</style>
<script>
promise_test(async t => {
const item = document.querySelector("#item");
let num_events = 0;
await new Promise(resolve => addEventListener("animationstart", () => {
num_events++;
resolve();
}));
// Reparent item
document.body.querySelector("#new-parent").moveBefore(item, null);
await new Promise(resolve => requestAnimationFrame(() => resolve()));
assert_equals(num_events, 1);
assert_not_equals(getComputedStyle(item).left, "0px");
});
</script>
</body>
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