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<!DOCTYPE html> <html> <body> Time: <input type="time" id="myTime" value="16:32:55"> <p>Click the button to change the default value of the time field.</p> <button type="button" onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myTime").defaultValue = "18:00"; } </script> </body> </html>