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