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chromium/third_party/blink/web_tests/paint/invalidation/background/background-generated-expected.html 

<!DOCTYPE HTML>
<body>
    <div style="width: 100px;
                padding-top: 100px;
                background-image: -webkit-gradient(linear, left top, left bottom, from(red), to(blue));
    ">
        <div id="target" style="height: 200px;"></div>
    </div>
</body>