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Result Size: 625 x 571
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Change Orientation Save Code Save to Google DriveSave to Google Drive Load from Google DriveLoad from Google Drive Change Theme, Dark/Light
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<!DOCTYPE html>
<html>
<head>
<style> 
#DIV1 {
  position: absolute;
  width: 300px;
  height: 150px;
  background-color: lightblue;
  border: 1px solid black;
}
​
#DIV2 {
  position: relative;
  top: 130px;
  left: 30px;
  width: 300px;
  height: 150px;
  background-color: coral;
  border: 1px solid black;
}
</style>
</head>
<body>
​
<h1>Change opacity with JavaScript</h1>
​
<p>Click the "Try it" button to see through the blue DIV element:</p>
​
<button onclick="myFunction()">Try it</button>
​
<div id="DIV2">
  <h1>Voila!</h1>
</div>
​
<div id="DIV1">
</div>
​
<script>
function myFunction() {
  document.getElementById("DIV1").style.opacity = "0.5";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/cssref/tryit.asp?filename=trycss3_js_opacity by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:20 GMT -->
</html>
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