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diff --git a/layout/reftests/async-scrolling/overscroll-fixed.html b/layout/reftests/async-scrolling/overscroll-fixed.html
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+++ b/layout/reftests/async-scrolling/overscroll-fixed.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 {
+ position: fixed;
+ left: 0px;
+ top: 0px;
+ width: 200px;
+ height: 200px;
+ background: green;
+ }
+ </style>
+</head>
+<body >
+ <!-- Test that an overscroll past one end of a viewport does not
+ cause a position fixed element to be transformed if the position
+ fixed element's containing block is the current viewport.
+ -->
+ <div></div>
+</body>
+</html>