checkerboard-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="1800"

      style="scrollbar-width:none">

<!-- This is a simple test where we set the async-scroll position so that it

     extends outside the displayport, and ensure that the checkerboarded area

     is filled with the expected background color. -->

<body style="background-color: green; height: 5000px">

  <div style="position:absolute; left: 0px; top: 1800px; width: 100px; height: 400px; background-color: red"></div>

</body>