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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">
  <p>The w3-opacity classs adds opacity/transparency to an element (opacity: 0.6), while w3-opacity-off turns off the transparency (opacity: 1).</p>
  <button onclick="myFunction()" class="w3-button w3-black">Toggle opacity (turn on and off)</button>
  <p id="Demo" class="w3-opacity w3-red">Demo paragraph.</p>
</div>
​
<script>
function myFunction() {
  var x = document.getElementById("Demo");
  if (x.className.indexOf("w3-opacity-off") == -1) {
    x.className += " w3-opacity-off";
  } else {
    x.className = x.className.replace(" w3-opacity-off", "");
  }
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/w3css/tryit.asp?filename=tryw3css_ref_utilities_opacity-off by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:12:31 GMT -->
</html>
​
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