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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("input").blur(function(){ alert("This input field has lost its focus."); }); }); </script> </head> <body> Enter your name: <input type="text"> <p>Write something in the input field, and then click outside the field to lose focus (blur).</p> </body> </html>