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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 Accordions</h2><p>In this example we add the w3-red class to an active accordion (when the button is clicked on and the content is opened).</p><button onclick="myFunction('Demo1')" class="w3-button w3-block w3-black w3-left-align">Open Section 1</button><div id="Demo1" class="w3-hide w3-container"> <p>Some text..</p></div><button onclick="myFunction('Demo2')" class="w3-button w3-block w3-black w3-left-align">Open Section 2</button><div id="Demo2" class="w3-hide w3-container"> <p>Some other text..</p></div></div><script>function myFunction(id) { var x = document.getElementById(id); if (x.className.indexOf("w3-show") == -1) { x.className += " w3-show"; x.previousElementSibling.className = x.previousElementSibling.className.replace("w3-black", "w3-red"); } else { x.className = x.className.replace(" w3-show", ""); x.previousElementSibling.className = x.previousElementSibling.className.replace("w3-red", "w3-black"); }}</script></body><!-- Mirrored from www.w3schools.com/w3css/tryit.asp?filename=tryw3css_accordion_active by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:28:06 GMT --></html>