<!DOCTYPE html>
<html>
<head>
<style>
.container {
    background-color: silver;
    margin: 20px;
    border-radius: 20px;
    padding: 20px;
}
.positioned-child {
    position: relative;
    height: 200px;
    width: 14em;
    border: 1px solid blue;
}
.absolute-positioned-child {
    position: absolute;
    top: 100px;
    left: 200px;
    width: 12em;
    height: 4em;
    border: 2px solid blue;
}
</style>
</head>
<body>
<div class="container">
    <div class="positioned-child" contenteditable="true">
        <div class="absolute-positioned-child"></div>
    </div>
</div>
<pre id="results"></pre>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
if (window.internals)
    internals.settings.setEditableRegionEnabled(true);
if (window.internals)
    results.textContent = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_EVENT_REGION | internals.LAYER_TREE_INCLUDES_ROOT_LAYER_PROPERTIES);
</script>
</body>
</html>