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function openCity(evt, cityName) {
  // Declare all variables
  var i, tabcontent, tablinks;
  // Get all elements with class=”tabcontent” and hide them
  tabcontent = document.getElementsByClassName(“tabcontent”);
  for (i = 0; i < tabcontent.length; i++) {
    tabcontent[i].style.display = “none”;
  // Get all elements with class=”tablinks” and remove the class “active”
  tablinks = document.getElementsByClassName(“tablinks”);
  for (i = 0; i < tablinks.length; i++) {
    tablinks[i].className = tablinks[i].className.replace(” active”, “”);
  // Show the current tab, and add an “active” class to the link that opened the tab
  document.getElementById(cityName).style.display = “block”;
  evt.currentTarget.className += ” active”;
/* Style the tab */
.tab {
  float: left;
  border: 1px solid #ccc;
  background-color: #f1f1f1;
  width: 30%;
  height: 300px;
/* Style the buttons that are used to open the tab content */
.tab button {
  display: block;
  background-color: inherit;
  color: black;
  padding: 22px 16px;
  width: 100%;
  border: none;
  outline: none;
  text-align: left;
  cursor: pointer;
/* Change background color of buttons on hover */
.tab button:hover {
  background-color: #ddd;
/* Create an active/current “tab button” class */
.tab {
  background-color: #ccc;
/* Style the tab content */
.tabcontent {
  float: left;
  padding: 0px 12px;
  border: 1px solid #ccc;
  width: 70%;
  border-left: none;
  height: 300px;
  display: none;
<div class=”tab”>
  <button class=”tablinks” onmouseover=”openCity(event, ‘London’)”>London</button>
  <button class=”tablinks” onmouseover=”openCity(event, ‘Paris’)”>Paris</button>
  <button class=”tablinks” onmouseover=”openCity(event, ‘Tokyo’)”>Tokyo</button>
<div id=”London” class=”tabcontent”>
  <p>London is the capital city of England.</p>
<div id=”Paris” class=”tabcontent”>
  <p>Paris is the capital of France.</p>
<div id=”Tokyo” class=”tabcontent”>
  <p>Tokyo is the capital of Japan.</p>