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<!DOCTYPE html> <html> <style> .example { border: 1px solid black; margin: 5px; } </style> <body> <h1>The Document Object</h1> <h2>The querySelectorAll() Method</h2> <p>Change the background color of all elements with class="example":</p> <div class="example"> A div with class="example" </div> <div class="example"> A div with class="example" </div> <p class="example">This is a p element with class="example".</p> <p>This is a <span class="example">span</span> element with class="example" inside another p element.</p> <script> const nodeList = document.querySelectorAll(".example"); for (i = 0; i < nodeList.length; i++) { nodeList[i].style.backgroundColor = "red"; } </script> </body> </html>
