1 files changed, 46 insertions, 0 deletions
diff --git a/layout/reftests/async-scrolling/overscroll-fixed-iframe-overscroll.html b/layout/reftests/async-scrolling/overscroll-fixed-iframe-overscroll.html
new file mode 100644
index 0000000000..d4af4f2235
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+++ b/layout/reftests/async-scrolling/overscroll-fixed-iframe-overscroll.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html
+      reftest-async-scroll
+      reftest-displayport-x="0" reftest-displayport-y="0"
+      reftest-displayport-w="800" reftest-displayport-h="2000">
+<head>
+  <style>
+    html {
+      scrollbar-width: none;
+    }
+    body {
+      height: 3000px;
+      margin: 0px;
+      padding: 0px;
+      border: 0px;
+    }
+    iframe {
+      width: 100%;
+      height: 100%;
+      margin: 0px;
+      padding: 0px;
+      border: 0px;
+      display: block;
+    }
+  </style>
+</head>
+<body >
+  <!-- Test that an overscroll past one end of a iframe does not
+       cause the fixed item in the iframe to participate in the
+       transform.
+  -->
+  <iframe src="data:text/html,
+    <!DOCTYPE HTML>
+    <html reftest-displayport-x='0' reftest-displayport-y='0'
+          reftest-displayport-w='800' reftest-displayport-h='2000'
+          reftest-async-scroll-x='0' reftest-async-scroll-y='-200'
+          style='scrollbar-width:none'>
+    <body style='padding: 0; margin: 0; border: 0'>
+      <div style='position: fixed; padding: 0; margin: 0; border: 0; background: green; width: 200px; height: 200px'>
+      </div>
+    </body>
+    </html>
+  ">
+  </iframe>
+</body>
+</html>