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<!DOCTYPE html>
<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>Accordions</h2>
<p>An accordion is used to show (and hide) HTML content:</p>
  
<button onclick="myFunction('Demo1')" class="w3-btn w3-block w3-black w3-left-align">Open Section 1</button>
<div id="Demo1" class="w3-container w3-hide">
  <h4>Section 1</h4>
  <p>Some text..</p>
</div>
​
</div>
<script>
function myFunction(id) {
  var x = document.getElementById(id);
  if (x.className.indexOf("w3-show") == -1) {
    x.className += " w3-show";
  } else { 
    x.className = x.className.replace(" w3-show", "");
  }
}
</script>
</body>
​
<!-- Mirrored from www.w3schools.com/w3css/tryit.asp?filename=tryw3css_accordion by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:28:06 GMT -->
</html>
​
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