bg-fixed-child-no-culling-3.html

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      reftest-displayport-x="0" reftest-displayport-y="-150"

      reftest-displayport-w="800" reftest-displayport-h="2000"

      reftest-async-scroll-x="0" reftest-async-scroll-y="-150"

      style="scrollbar-width: none; background: linear-gradient(white, white) top left fixed no-repeat;">

<body style="height: 3000px; margin: 0;">

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  <script>

    document.documentElement.scrollTop = 150;

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</body>

</html>