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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 5px; } </style> </head> <body> <p>Click the button to add a background color to the second child node (index 1) of div.</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> Whitespace inside elements is considered as text, and text is considered as nodes. In this example, index 0, 2 and 4 in DIV are text nodes.</p> <script> function myFunction() { var c = document.getElementById("myDIV").childNodes; c[1].style.backgroundColor = "yellow"; } </script> </body> </html>