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<html><head><style>#myDIV { border: 1px solid black; margin: 5px;}</style></head><body><div id="myDIV"> <p>This is a p element in div.</p> <p>This is also a p element in div.</p></div><p>Click the button to add a background color to the first p element (index 0) in div.</p><button onclick="myFunction()">Try it</button><p><strong>Note:</strong> The querySelectorAll() method is not supported in Internet Explorer 8 and earlier versions.</p><script>function myFunction() { var x = document.getElementById("myDIV").querySelectorAll("p"); x[0].style.backgroundColor = "red";}</script></body><!-- Mirrored from www.mdssup.ma/jsref/tryit.asp?filename=tryjsref_element_queryselectorall_p by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 05 Sep 2022 15:18:58 GMT --></html>