1 files changed, 65 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-view-transitions/root-style-change-during-animation.html b/testing/web-platform/tests/css/css-view-transitions/root-style-change-during-animation.html
new file mode 100644
index 0000000000..d1d291124b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/root-style-change-during-animation.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transitions: root element style changes during transition</title>
+<link rel="help" href="https://github.com/WICG/view-transitions">
+<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>
+