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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 5px; } </style> </head> <body> <p>Click the button to find out how many children the div element below has.</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> <p>First p element</p> <p>Second p element</p> </div> <p><strong>Note:</strong> The childElementCount property is not supported in IE8 and earlier versions.</p> <p id="demo"></p> <script> function myFunction() { var c = document.getElementById("myDIV").childElementCount; document.getElementById("demo").innerHTML = c; } </script> </body> </html>