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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> </head> <body> <h2>Get Number of Child Element in this HTML Element using JavaScript</h2> <div id="myElement"> <p>Hello World!</p> <ul><li>List Item</li></ul> <div>Sample World</div> </div> <br> <button type="button" onclick="execute()">Click Me</button> <p id="out"></p> <script> function execute(){ var element = document.getElementById('myElement'); var count = element.childElementCount; document.getElementById('out').innerHTML = 'Number of Child Elements in #myElement: ' + count; } </script> </body> </html>