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chromium/third_party/blink/web_tests/paint/invalidation/box/negative-shadow-box-shrink-expected.html 

<!DOCTYPE html>
<body style="margin: 100px">
    <div id="outer" style="box-shadow: 40px -40px #F00;">
        <div id="inner1" style="height: 100px; background-color: blue"></div>
    </div>
</body>