<!DOCTYPE html>
<html>
<style>
    html {
        background-color: white;
    }
    body {
        background-color: silver;
        margin: 0;
    }
    
    .tall {
        position: absolute;
        top: 0;
        background-color: gray;
        height: 2000px;
        width: 20px;
    }
</style>
<script>
window.onload = () => {
    window.addEventListener('wheel', () => { results.textContent += 'passive wheel\n' }, { passive: true });
    if (window.testRunner)
        testRunner.dumpAsText();

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