<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; } </style> </head> <body> <div id="myDIV"> <p>I am a p element inside div, and I have a <span id="mySPAN"><b>span</b></span> element inside of me.</p> </div> <span id="mySPAN2"><b>span</b></span> <p>Click the button to find out if the div element contains a span element.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var span = document.getElementById("mySPAN"); var div = document.getElementById("myDIV").contains(span); window.alert(div); } </script> </body> </html>