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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>Active Tabs</h2> <p>To highlight the current tab/page the user is on, add a color class, and use JavaScript to update the active link.</p> <div class="w3-bar w3-black"> <button class="w3-bar-item w3-button tablink w3-red" onclick="openCity(event,'London')">London</button> <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Paris')">Paris</button> <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Tokyo')">Tokyo</button> </div> <div id="London" class="w3-container w3-border city"> <h2>London</h2> <p>London is the capital city of England.</p> </div> <div id="Paris" class="w3-container w3-border city" style="display:none"> <h2>Paris</h2> <p>Paris is the capital of France.</p> </div> <div id="Tokyo" class="w3-container w3-border 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"; } tablinks = document.getElementsByClassName("tablink"); for (i = 0; i < x.length; i++) {