<! DOCTYPE html>"en">"UTF-8"> <title>Title</title> <style>. hide{Display:none; }. Item. header{height:35px; Background-color: #2459a2; Color:white; Line-height:35px;/*Place Vertical*/ } </style>"height:48px"></div> <div style="width:300px"> <divclass="Item"> <div id='I1' class="Header"onclick="changemenu (' I1 ')"> Menu One </div> <divclass="content"> <div> content 1</div> <div> content 1</div> <div> content 1< /div> </div> </div> <divclass="Item"> <div id ='I2' class="Header"onclick="changemenu (' i2 ')"> Menu Two </div> <divclass="content"> <div> content 2</div> <div> content 2</div> <div> content 2< /div> </div> </div> <divclass="Item"> <div id ='i3' class="Header"onclick="changemenu (' i3 ')"> Menu Three </div> <divclass="content"> <div> content 3</div> <div> content 3</div> <div> content 3< /div> </div> </div> </div> <!--Modify Menu functions--<script>function Changemenu (mid) {varCurrent_header = document.getElementById (mid);//Current headConsole.log (Current_header); varCurrent_base_header =current_header.parentElement.parentElement Console.log (Current_base_header); varCurrent_list =Current_base_header.children; for(varI=0; i<current_list.length;i++){ varCurrent_item =Current_list[i]; current_item.children[1].classlist.add ("Hide"); } current_header.nextElementSibling.classList.remove ('Hide') } </script></body>JavaScript left Menu