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<!DOCTYPE html> <html> <body> Password: <input type="password" id="myPsw"> <p>Click the button to set the password field to read-only.</p> <p><strong>Tip:</strong> To see the effect, try to type something in the password field before and after clicking the button.</p> <button onclick="myFunction()">Set read-only</button> <script> function myFunction() { document.getElementById("myPsw").readOnly = true; } </script> </body> </html>