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<!DOCTYPE html>
<title>Node.moveBefore should preserve CSS transition 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>
#item {
width: 100px;
height: 100px;
background: green;
transition: left 10s;
position: absolute;
left: 0;
}
section {
position: relative;
}
body {
margin-left: 0;
}
</style>
<script>
promise_test(async t => {
const item = document.querySelector("#item");
assert_equals(item.getBoundingClientRect().x, 0);
item.style.left = "400px";
await new Promise(resolve => item.addEventListener("transitionstart", resolve));
document.querySelector("#new-parent").moveBefore(item, null);
await new Promise(resolve => requestAnimationFrame(() => resolve()));
assert_less_than(item.getBoundingClientRect().x, 399);
});
</script>
</body>
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