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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="4/w3.css"><body><div class="w3-container"> <h2>Tabs</h2> <p>Tabs are perfect for single page web applications, or for web pages capable of displaying different subjects. Click on the links below.</p></div><div class="w3-bar w3-black"> <button class="w3-bar-item w3-button" onclick="openCity('London')">London</button> <button class="w3-bar-item w3-button" onclick="openCity('Paris')">Paris</button> <button class="w3-bar-item w3-button" onclick="openCity('Tokyo')">Tokyo</button></div><div id="London" class="w3-container city"> <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><script>function openCity(cityName) { var i; var x = document.getElementsByClassName("city"); for (i = 0; i < x.length; i++) { x[i].style.display = "none"; } document.getElementById(cityName).style.display = "block"; }</script>