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diff --git a/layout/reftests/async-scrolling/overscroll-fixed-transform.html b/layout/reftests/async-scrolling/overscroll-fixed-transform.html
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+++ b/layout/reftests/async-scrolling/overscroll-fixed-transform.html
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+<!DOCTYPE html>
+<html
+      reftest-async-scroll
+      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">
+<head>
+  <style>
+    html {
+      scrollbar-width: none;
+    }
+    body {
+      height: 3000px;
+      margin: 0;
+    }
+    div.container {
+      overflow: scroll;
+      width: 100%;
+      height: 100%;
+      transform: translate(0px);
+      scrollbar-width: none;
+    }
+    div.fixed {
+      position: fixed;
+      top: 0px;
+      width: 200px;
+      height: 200px;
+      background: green;
+    }
+  </style>
+</head>
+<body >
+  <!-- Test that an overscroll past one end of a transformed container is
+       rendered as having the content create a gutter, and that
+       the overscroll is reduced by some factor such that
+       a 100px scroll must produce a rendered translation of less than
+       100px.
+
+       Current overscroll physics mean that an instantaneous overscroll
+       by 200px produces an 8px gutter. This is governed by the logic in
+       Axis::ApplyResistance(); if that logic is changed, this test will
+       need to be modified to account for the new result.
+  -->
+  <div class="container">
+    <div class="fixed">
+    </div>
+  </div>
+</body>
+</html>