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<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: root element style changes during transition</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">
<link rel="match" href="root-style-change-during-animation-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
#target {
width: 100px;
height: 100px;
contain: paint;
background: blue;
view-transition-name: target;
}
#hidden {
background: pink;
width: 10px;
height: 10px;
view-transition-name: hidden;
contain: paint;
}
html::view-transition {
background: grey;
}
html::view-transition-group(hidden) {
animation-duration: 500s;
visibility: hidden;
}
html::view-transition-group(root) {
visibility: hidden;
}
.test::view-transition-group(target) {
background: green;
}
.test::view-transition-image-pair(target) {
visibility: hidden;
}
</style>
<div id=target></div>
<div id=hidden></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");
function flipClass() {
document.documentElement.classList.add("test");
requestAnimationFrame(takeScreenshot);
}
async function runTest() {
document.startViewTransition(() => {
hidden.style.width="20px";
requestAnimationFrame(() => requestAnimationFrame(flipClass));
});
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>
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