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chromium/third_party/blink/manual_tests/scrollbars/scrollbars-in-composited-layers.html 

<!DOCTYPE html>

<html>
<head>
    <style>
    .scroll {
        width: 200px;
        height: 200px;
        border: 1px solid black;
        margin: 15px;
        padding: 5px;
        overflow-y: scroll;
        transform: translateZ(0);
        box-shadow: 0 0 15px black;
    }

    .rotated {
        transform: rotate3d(0, 0, 1, 45deg);
    }
    .scroll > div {
        background-color: silver;
        width: 500px;
        height: 1000px;
    }
    </style>
</head>
<body>

    <p>Overlay scrollbars (on Mac) should show in the correct place when scrolling.</p>
    <div class="scroll">
        <div></div>
    </div>

    <p>Overlay scrollbars (on Mac) should show in the correct place when scrolling, and the resize corner should show in the correct place.</p>
    <div class="scroll" style="resize: both; overflow:hiddens">
        <div></div>
    </div>

    <p>Overlay scrollbars (on Mac) should show in the correct place when scrolling, and the resize corner should show in the correct place.</p>
    <div class="rotated scroll" style="resize: both; overflow:hiddens">
        <div></div>
    </div>

</body>
</html>