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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>Toggle Show/Hide</h2>
  <p>Click on the button to show/hide a paragraph.</p>
​
  <button onclick="myFunction()" class="w3-button w3-black">Button</button>
​
  <p>Paragraph 1.</p>
  <p id="Demo" class="w3-hide">Paragraph 2.</p>
  <p>Paragraph 3.</p>
</div>
​
<script>
function myFunction() {
  var x = document.getElementById("Demo");
  if (x.className.indexOf("w3-show-block") == -1) {
    x.className += " w3-show-block";
  } else { 
    x.className = x.className.replace(" w3-show-block", "");
  }
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/w3css/tryit.asp?filename=tryw3css_ref_utilities_show-block by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:12:31 GMT -->
</html>
​
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