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<!DOCTYPE html>
<style>
#container {
    overflow: scroll;
    width: 400px;
    height: 300px;
    background: linear-gradient(black, white);
    background-attachment: local;
}

#bloat {
    height: 1000px;
    transform: translateZ(0);
}
</style>
<div id="container">
    <div id="bloat"></div>
</div>
<script>
    if (window.testRunner) {
        testRunner.waitUntilDone();
        testRunner.layoutAndPaintAsyncThen(function() {
            document.getElementById('container').scrollTop = 1000;
            testRunner.notifyDone();
        });
    } else {
        // For manual test.
        setTimeout(function() {
            document.getElementById('container').scrollTop = 1000;
        }, 500);
    }
</script>