<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<style>
.container {
    background-color: blue;
    width: 200px;
    height: 200px;
    will-change: transform; /* Needed to trigger event region creation */
    visibility: hidden;
}

.inner {
    background-color: green;
    width: 50px;
    height: 50px;
    float: right;
    visibility: visible;
}
.scroller {
    overflow: scroll;
    height: 50px;
    width: 50px;
}
.scrollcontent {
    height: 100px;
    width: 50px;
}
</style>
<body>
<div class="container">
    <div class="inner"></div>
</div>
<div class="scroller"><div class="scrollcontent"></div></div>
<pre id="results"></pre>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

if (window.internals)
    results.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_EVENT_REGION);
</script>
</body>
</html>