<!DOCTYPE html>
<html>
<body>
<iframe id="testFrame" srcdoc="<div style='touch-action: none; width: 100px; height: 100px; border:1px solid black'></div>" onload="runTest()"></iframe>
<pre id="results"></pre>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

function runTest()
{
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        results.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_EVENT_REGION | internals.LAYER_TREE_INCLUDES_ROOT_LAYER_PROPERTIES);
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}
</script>
</body>
</html>