1 files changed, 54 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-view-transitions/backdrop-filter-animated.html b/testing/web-platform/tests/css/css-view-transitions/backdrop-filter-animated.html
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index 0000000000..3a5f0665b0
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+++ b/testing/web-platform/tests/css/css-view-transitions/backdrop-filter-animated.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>View transitions: captured backdrop filter on the element animates</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="backdrop-filter-animated-ref.html">
+<script src="/common/reftest-wait.js"></script>
+<style>
+.box {
+  background: green;
+  width: 100px;
+  height: 100px;
+}
+#target {
+  view-transition-name: target;
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  top: 20px;
+  left: 20px;
+  backdrop-filter: grayscale(1);
+}
+#target.after {
+  backdrop-filter: grayscale(0);
+}
+
+html::view-transition-group(*) {
+  animation-duration: 1s;
+  animation-timing-function: linear;
+  animation-play-state: paused;
+}
+html::view-transition-new(*) { animation: unset; opacity: 1; }
+html::view-transition-old(*) { animation: unset; opacity: 0; }
+</style>
+<div class=box></div>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+async function runTest() {
+  let transition = document.startViewTransition(() => target.classList.add("after"));
+  transition.ready.then(() => {
+    requestAnimationFrame(() => requestAnimationFrame(() => {
+      document.getAnimations().forEach((animation) => {
+        animation.currentTime = 500;
+      });
+      requestAnimationFrame(takeScreenshot);
+    }));
+  });
+}
+onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
+</script>
+</html>