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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; margin: 5px; } </style> </head> <body> <div id="myDIV"> <h2 class="example">A heading with class="example" in div</h2> <p class="example">A paragraph with class="example" in div.</p> </div> <p>Click the button to add a background color to the first element in DIV with class="example" (index 0).</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myDIV").querySelectorAll(".example"); x[0].style.backgroundColor = "red"; } </script> </body> <!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_element_queryselectorall_class by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:44 GMT --> </html>
