1 files changed, 48 insertions, 0 deletions
diff --git a/layout/reftests/async-scrolling/curtain-effect-1.html b/layout/reftests/async-scrolling/curtain-effect-1.html
new file mode 100644
index 0000000000..09d57c23b1
--- /dev/null
+++ b/layout/reftests/async-scrolling/curtain-effect-1.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html style="margin: 0; padding: 0; z-index: 0" reftest-async-scroll reftest-async-scroll-y="400">
+<head>
+ <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+</head>
+<body style="margin: 0; padding: 0; z-index: 0">
+
+<div style="height: 100vh">
+<div style="width: 100%;
+            height: 100vh;
+            position: absolute;
+            top: 0;
+            left: 0;
+            z-index: 2">
+<div style="position: absolute;
+            width: 100%;
+            height: 100vh;
+            left: 0;
+            top: 0;
+            z-index: 3">
+<div style="position: relative;
+            width: 100%;
+            height: 100%;
+            background-image: linear-gradient(lime, blue);">
+</div></div></div></div>
+
+<div style="height: 100vh;
+            position: relative;
+            background: black;">
+<div style="position: absolute;
+            width: 100%;
+            height: 100%;
+            top: 0;
+            left: 0;
+            clip: rect(0, auto, auto, 0);">
+<div style="width: 100%;
+            height: 100%;
+            top: 0;
+            left: 0;
+            position: fixed;
+            transform: translateZ(0);
+            z-index: 3">
+<div style="position: relative;
+            width: 100%;
+            height: 100%;
+            background-image: linear-gradient(yellow, red);">
+</div></div></div></div>
+</body></html>