W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css">
<body>

<div class="w3-row">
    <a href="javascript:void(0)" onclick="openCity(event, 'London');">
      <div class="w3-third tablink w3-bottombar w3-hover-light-grey w3-padding">London</div>
    </a>
    <a href="javascript:void(0)" onclick="openCity(event, 'Paris');">
      <div class="w3-third tablink w3-bottombar w3-hover-light-grey w3-padding">Paris</div>
    </a>
    <a href="javascript:void(0)" onclick="openCity(event, 'Tokyo');">
      <div class="w3-third tablink w3-bottombar w3-hover-light-grey w3-padding">Tokyo</div>
    </a>
  </div>

<div id="London" class="w3-container city" style="display:none">
    <h2>London</h2>
    <p>London is the capital city of England.</p>
  </div>

<div id="Paris" class="w3-container city" style="display:none">
    <h2>Paris</h2>
    <p>Paris is the capital of France.</p> 
  </div>

<div id="Tokyo" class="w3-container city" style="display:none">
    <h2>Tokyo</h2>
    <p>Tokyo is the capital of Japan.</p>
  </div>
</div>

</body>
</html>

​x
 
<!DOCTYPE html><html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css"><body>​<div class="w3-container">  <h2>Tabs in a Grid</h2>​  <div class="w3-row">    <a href="javascript:void(0)" onclick="openCity(event, 'London');">      <div class="w3-third tablink w3-bottombar w3-hover-light-grey w3-padding">London</div>    </a>    <a href="javascript:void(0)" onclick="openCity(event, 'Paris');">      <div class="w3-third tablink w3-bottombar w3-hover-light-grey w3-padding">Paris</div>    </a>    <a href="javascript:void(0)" onclick="openCity(event, 'Tokyo');">      <div class="w3-third tablink w3-bottombar w3-hover-light-grey w3-padding">Tokyo</div>    </a>  </div>​  <div id="London" class="w3-container city" style="display:none">    <h2>London</h2>    <p>London is the capital city of England.</p>  </div>​  <div id="Paris" class="w3-container city" style="display:none">    <h2>Paris</h2>    <p>Paris is the capital of France.</p>   </div>​  <div id="Tokyo" class="w3-container city" style="display:none">    <h2>Tokyo</h2>    <p>Tokyo is the capital of Japan.</p>  </div></div>​<script>function openCity(evt, cityName) {  var i, x, tablinks;  x = document.getElementsByClassName("city");  for (i = 0; i < x.length; i++) {    x[i].style.display = "none";