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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
#myDIV {
  width: 100%;
  padding: 50px 0;
  text-align: center;
  background-color: lightblue;
  margin-top: 20px;
  visibility: hidden;
}
</style>
</head>
<body>
​
<p>Click the button to find out if the DIV is hidden. If it is, then display it.</p>
​
<button onclick="myFunction()">Try it</button>
​
<div id="myDIV">
This is my DIV element.
</div>
​
<p>Some text...</p>
​
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
  if (window.getComputedStyle(x).visibility === "hidden") {
    x.style.visibility = "visible";
  }
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/howto/tryit.asp?filename=tryhow_js_check_hidden2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:38:50 GMT -->
</html>
​
​
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