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diff --git a/layout/reftests/async-scrolling/position-fixed-inside-sticky-1.html b/layout/reftests/async-scrolling/position-fixed-inside-sticky-1.html
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+++ b/layout/reftests/async-scrolling/position-fixed-inside-sticky-1.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="50">
+<style>
+html {
+ scrollbar-width: none;
+}
+body {
+ height: 4000px;
+ margin: 0;
+}
+#sticky {
+ position: sticky;
+ top: -1000px; /* scrolls regularly until the top edge hits -1000px, then stays fixed */
+ height: 1200px;
+ border-bottom: 1px solid black;
+}
+#fixed {
+ position: fixed;
+ top: 50px;
+ left: 50px;
+ width: 100px;
+ height: 100px;
+ box-sizing: border-box;
+ border: 1px solid blue;
+}
+</style>
+<div id="sticky">
+ <div id="fixed"></div>
+</div>
+</html>