1 files changed, 31 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-with-top-layer-004.html b/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-with-top-layer-004.html
new file mode 100644
index 0000000000..e21b11e92d
--- /dev/null
+++ b/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-with-top-layer-004.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<html class="reftest-wait">
+<meta charset="utf8">
+<title>CSS Content Visibility: dialog shows under c-v auto</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<link rel="match" href="spacer-with-top-layer-ref.html">
+<meta name="assert" content="top layer dialogs render under c-v auto">
+
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+.box { width: 100px; height: 100px; border: 1px solid black; }
+.auto { content-visibility: auto }
+.spacer { width: 10px; height: 3000px; background: lightblue; }
+</style>
+
+<div class=spacer></div>
+<div id=container class="box auto">
+content
+<dialog id=dialog>PASS<div id=inner></div></dialog>
+</div>
+
+<script>
+function runTest() {
+  dialog.showModal();
+  takeScreenshot();
+}
+
+onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
+</script>