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diff --git a/layout/reftests/async-scrolling/checkerboard-3.html b/layout/reftests/async-scrolling/checkerboard-3.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="2100"
+ style="scrollbar-width: none">
+<!-- This is the exact same test as checkerboard-2.html, but we put
+ the scroll position entirely outside of the displayport. This ensures
+ that even we do the proper checkerboarding even if the layer would
+ otherwise be culled out in the compositor because it is not on-screen. -->
+<body style="background-color: green; height: 5000px">
+ <div style="position:fixed; left: 0px; top: 0px; width: 100px; height: 500px; background-color: purple; z-index: -1"></div>
+ <div style="position:absolute; left: 0px; top: 500px; background-color: yellow; width: 100px; height: 4500px"></div>
+ <div style="position:fixed; left: 10px; top: 10px; width: 10px; height: 10px; background-color: blue"></div>
+</body>