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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<body>
<meta http-equiv="content-type" content="text/html">
<p>Click the button to change the value of the http-equiv attribute to refresh, and the content attribute to 30 seconds. This will refresh the document every 30 seconds.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  document.getElementsByTagName("META")[0].httpEquiv = "refresh";
  document.getElementsByTagName("META")[0].content = "30";
  document.getElementById("demo").innerHTML = "The document will refresh every 30 seconds.";
}
</script>
</body>
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_meta_httpequiv2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:46 GMT -->
</html>
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