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<html><head><style>div { border: 1px solid black; margin: 5px;}</style></head><body><div id="myDIV"> <p class="child">A p element with class="child" in a div.</p> <p class="child">Another p element with class="child" in a div.</p> <p>A p element in div with a <span class="child">span element with class="child"</span> inside of it.</p></div><p>Click the button to add a background color to all elements with class="child" inside the div element with id="myDIV".</p><button onclick="myFunction()">Try it</button><p><strong>Note:</strong> The getElementsByClassName() method is not supported in Internet Explorer 8 and earlier versions.</p><script>function myFunction() { var x = document.getElementById("myDIV"); var y = x.getElementsByClassName("child"); var i; for (i = 0; i < y.length; i++) { y[i].style.backgroundColor = "red"; }}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_element_getelementsbyclassname_loop by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:03:56 GMT --></html>