To check if an HTML element has child nodes, you can use the hasChildNodes() method. This method returns true if the specified node has any child nodes, otherwise false.

Let us say you have the following HTML code snippet:

<html>
<body>
    <div class="wrapper">
        <button id="btn">Click Me</button>
    </div>
</body>
</html>

The following example shows that how you can use the hasChildNodes() method to check if the <body> and <button> tags have any child nodes:

const body = document.body;
const btn = document.querySelector('button');

console.log(body.hasChildNodes()); // true
console.log(btn.hasChildNodes()); // true

Whitespace and comments inside a node are also considered as text and comment nodes. So if you leave any whitespace, comments, or line feeds inside an element, that element still has child nodes.

The hasChildNodes() method works in all modern browsers, and IE9 and up.

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