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<html><head><style>div { border: 1px solid black; margin: 5px;}</style></head><body><div class="example"> <p>P element in first div with class="example". Div's index is 0.</p></div><div class="example color"> <p>P element in first div with class="example color". Div's index is 0.</p></div><div class="example color"> <p>P element in second div with class="example color". Div's index is 1.</p></div><p>Click the button to change the background color of the first div element with the classes "example" and "color".</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.getElementsByClassName("example color"); x[0].style.backgroundColor = "red";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_document_getelementsbyclassname2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:03:32 GMT --></html>