1 files changed, 55 insertions, 0 deletions
diff --git a/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static-iframe.html b/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static-iframe.html
new file mode 100644
index 00000000000..1903b9cacbd
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static-iframe.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transitions: use snapshot containing block for static position in iframe</title>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/#snapshot-containing-block-concept/">
+<link rel="match" href="snapshot-containing-block-static-iframe-ref.html">
+
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/rendering-utils.js"></script>
+
+<style>
+#inner {
+  width: 400px;
+  height: 200px;
+}
+</style>
+<iframe id="inner" srcdoc="
+  <style>
+  body {
+    height: 200vh;
+    overflow: hidden;
+  }
+  ::view-transition {
+    position: static;
+    display: block;
+    width: 100%;
+    height: 100%;
+    background: limegreen;
+  }
+  ::view-transition-group(*),
+  ::view-transition-image-pair(*),
+  ::view-transition-old(*),
+  ::view-transition-new(*) {
+    animation-play-state: paused;
+  }
+
+  </style>
+  <body></body>
+"></iframe>
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+async function runTest() {
+  // Start the view transition at a scroll offset so that the snapshot
+  // containing block differs from the initial containing block.
+  inner.contentWindow.scrollTo(0, 100);
+  await waitForAtLeastOneFrame();
+
+  const contentDocument = inner.contentDocument;
+  let vt = inner.contentDocument.startViewTransition();
+  await vt.ready;
+  takeScreenshot();
+}
+
+onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
+</script>