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diff --git a/layout/reftests/async-scrolling/bg-fixed-child-mask.html b/layout/reftests/async-scrolling/bg-fixed-child-mask.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="scrollbar-width:none">
+<body style="height:3000px; margin:0;">
+ <div style="margin-top: 100px; height: 100px;
+ background-image:url(repeatable-diagonal-gradient.png);
+ background-attachment:fixed;
+ background-repeat:no-repeat;
+ background-position:top left;
+ border-radius:50px;">
+ </div>
+ <!-- test that the clip of a background-attachment:fixed background of a
+ child element moves correctly during async scrolling -->
+</body>
+</html>