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Add 'this' to the function called by anchor link event onclick <a onclick="myAccFunc(this)" href="#">First group<i class="fa fa-caret-down"></i></a> Then you need to ref that specifically clicked element, transverse down to next sibling element and change that elements classname function myAccFunc(elem)//amended by dsonesuk { var x = elem.nextElementSibling;//amended by dsonesuk if (x.className.indexOf("w3-show") == -1) { x.className += " w3-show"; x.previousElementSibling.className += " w3-green"; } else { x.className = x.className.replace(" w3-show", ""); x.previousElementSibling.className = x.previousElementSibling.className.replace(" w3-green", ""); } }