Tryit Editor v3.6

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {box-sizing: border-box}
body {font-family: "Lato", sans-serif;}

/* Style the tab */
.tab {
  float: left;
  border: 1px solid #ccc;
  background-color: #f1f1f1;
  width: 30%;
  height: 300px;
}

/* Style the buttons inside the tab */
.tab button {
  display: block;
  background-color: inherit;
  color: black;
  padding: 22px 16px;
  width: 100%;
  border: none;
  outline: none;
  text-align: left;
  cursor: pointer;
  transition: 0.3s;
  font-size: 17px;
}

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

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

/* Style the tab content */
.tabcontent {
  float: left;
  padding: 0px 12px;
  border: 1px solid #ccc;
  width: 70%;
  border-left: none;
  height: 300px;
}
</style>
</head>
<body>

<h2>Vertical Tabs</h2>
<p>Click on the buttons inside the tabbed menu:</p>

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

<div id="London" class="tabcontent">
  <h3>London</h3>
  <p>London is the capital city of England.</p>
</div>

<div id="Paris" class="tabcontent">
  <h3>Paris</h3>
  <p>Paris is the capital of France.</p> 
</div>

<div id="Tokyo" class="tabcontent">
  <h3>Tokyo</h3>
  <p>Tokyo is the capital of Japan.</p>
</div>

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

</html>

​x
 
<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>* {box-sizing: border-box}body {font-family: "Lato", sans-serif;}​/* Style the tab */.tab {  float: left;  border: 1px solid #ccc;  background-color: #f1f1f1;  width: 30%;  height: 300px;}​/* Style the buttons inside the tab */.tab button {  display: block;  background-color: inherit;  color: black;  padding: 22px 16px;  width: 100%;  border: none;  outline: none;  text-align: left;  cursor: pointer;  transition: 0.3s;  font-size: 17px;}​/* Change background color of buttons on hover */.tab button:hover {  background-color: #ddd;}​/* Create an active/current "tab button" class */.tab button.active {  background-color: #ccc;}​/* Style the tab content */.tabcontent {  float: left;  padding: 0px 12px;  border: 1px solid #ccc;  width: 70%;

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