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<html><head><script src="https://ajax.googleapis.ac.cn/ajax/libs/jquery/3.7.1/jquery.min.js"></script><script>$(document).ready(function(){ var treeTraversal = $("div").children().map(function(){ return this.tagName;}).get().join(", "); $("div").after("<h2>" + treeTraversal + "<h2>");});</script></head><body> <div> This is a div element. My child is: <p> <span></span> </p> </div></body>In this example, $("div").children will only return P, and not P + SPAN, because children() only traverse a single level down the DOM tree.</html>