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<!DOCTYPE html>
<html class="reftest-wait">
<title>View transitions: Modify style via CSSOM</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:bokan@chromium.org">
<link rel="match" href="modify-style-via-cssom-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
#box {
width: 100px;
height: 100px;
background: limegreen;
}
html::view-transition-group(root) {
animation-duration: 300s;
}
html::view-transition-new(root) {
animation: none;
opacity: 0;
}
html::view-transition-old(root) {
animation: none;
opacity: 1;
}
</style>
<div id="box"></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");
function rAF() {
return new Promise(resolve => requestAnimationFrame(resolve));
}
async function runTest() {
await document.startViewTransition().ready;
await rAF();
await rAF();
// Once the animation is running, ensure modifying style via CSSOM is
// effective.
const cssSheet = new CSSStyleSheet();
cssSheet.replaceSync(`::view-transition-old(root) {
transform: translateY(100px);
}`);
document.adoptedStyleSheets = [cssSheet];
await rAF();
takeScreenshot();
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>
</html>
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