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這是本文件的舊版！

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London

London is the capital city of England.

Paris

Paris is the capital of France.

Tokyo

Tokyo is the capital of Japan.

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

float: left;
border: 1px solid #ccc;
background-color: #f1f1f1;
width: 30%;
height: 300px;

} .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;

} .tab button:hover {

background-color: #ddd;

} .tab button.active {

background-color: #ccc;

} .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>

<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>

<h3>London</h3>
<p>London is the capital city of England.</p>

<h3>Paris</h3>
<p>Paris is the capital of France.</p>

<h3>Tokyo</h3>
<p>Tokyo is the capital of Japan.</p>

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

}

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