<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<style>
.scroll {
    overflow:scroll;
    width:300px;
    height:300px;
}
.contents {
    position:relative;
    background-color:blue;
    width:200px;
    height:200px;
}
.offset {
    left: 200px;
}

</style>
<script>
window.onload = () => {
    if (window.testRunner)
        testRunner.dumpAsText();

    if (window.internals)
        results.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_EVENT_REGION);
}
</script>
<body>
<div class=scroll>
    <div class="contents">
    </div>
    <div class="contents offset">
    </div>
</div>
<pre id="results"></pre>
</body>
</html>