HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>onblur property</title>
</head>
<body>
  <input placeholder="Type, then click away" />
  <pre id="out">(waiting)</pre>
  <script>
    var input = document.querySelector("input");
    var out = document.getElementById("out");
    input.onblur = function () {
      out.textContent = "Field lost focus";
    };
  </script>
</body>
</html>

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Element blur — onblur (Try It)