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<!DOCTYPE html>
<html>
<body>
​
<p>Click anywhere in the document (the right frame) to get focus. If you click outside the document, it will lose focus.</p>
​
<p id="demo"></p>
​
<script>
setInterval("myFunction()", 1);
​
function myFunction() {
  var x = document.getElementById("demo");
  if (document.hasFocus()) {
    x.innerHTML = "The document has focus.";
  } else {
    x.innerHTML = "The document DOES NOT have focus.";
  }
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_document_hasfocus by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:44 GMT -->
</html>
​
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