HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>blur contrast</title>
</head>
<body>
  <h1>window.blur vs element.blur</h1>
  <input id="name" type="text" value="Focus me first">
  <button type="button" id="btn">Compare</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var input = document.getElementById("name");
      input.focus();
      input.blur();
      window.blur();
      document.getElementById("out").textContent =
        "Compared window.blur() with element.blur()";
    };
  </script>
</body>
</html>

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JavaScript window.blur() vs element.blur() (Try It)