Закрытие вкладок при нажатии

function toggleCity(evt, cityName) {
    var i, tabcontent, tablinks;
    tabcontent = document.getElementsByClassName("tabcontent");
   
    tablinks = document.getElementsByClassName("tablinks");
    for (i = 0; i < tablinks.length; i++) {
        tablinks[i].className = tablinks[i].className.replace(" active", "");
    }
    var prev_state_display = document.getElementById(cityName).style.display;
    
    for (i = 0; i < tabcontent.length; i++) {
        tabcontent[i].style.display = "none";
    }
    
    if ( prev_state_display === "none"){
        document.getElementById(cityName).style.display = "block";
        evt.currentTarget.className += " active";
    } else {
        document.getElementById(cityName).style.display = "none";
        evt.currentTarget.className.replace(" active", "");
    }
}

// Get the element with id = "defaultOpen" and click on it
document.getElementById("defaultOpen").click();

/* Style the tab */
.tab {
    overflow: hidden;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}

/* Style the buttons inside the tab */
.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
    font-size: 17px;
}

/* Change background color of buttons on hover */
.tab button:hover {
    background-color: #ddd;
}

/* Create an active/current tablink class */
.tab button.active {
    background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
    display: none;
    padding: 6px 12px;
    border: 1px solid #ccc;
    border-top: none;
}

/* Style the close button */
.topright {
    float: right;
    cursor: pointer;
    font-size: 28px;
}

.topright:hover {color: red;}

<div class = "tab">
  <button class = "tablinks" onclick = "toggleCity(event, 'London')" id = "defaultOpen">London</button>
  <button class = "tablinks" onclick = "toggleCity(event, 'Paris')">Paris</button>
  <button class = "tablinks" onclick = "toggleCity(event, 'Tokyo')">Tokyo</button>
</div>

<div id = "London" class = "tabcontent">
  <span onclick = "toggleCity(event, 'London')" class = "topright">&times</span>
  <h3>London</h3>
  <p>London is the capital city of England.</p>
</div>

<div id = "Paris" class = "tabcontent">
  <span onclick = "toggleCity(event, 'Paris')" class = "topright">&times</span>
  <h3>Paris</h3>
  <p>Paris is the capital of France.</p> 
</div>

<div id = "Tokyo" class = "tabcontent">
  <span onclick = "toggleCity(event, 'Tokyo')" class = "topright">&times</span>
  <h3>Tokyo</h3>
  <p>Tokyo is the capital of Japan.</p>
</div>