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<!DOCTYPE html> <html> <body> <input type="number" id="myNumber" value="2"> <p>Click the button to set the number field to read-only.</p> <p><strong>Tip:</strong> To see the effect, try to type something in the number field before and after clicking the button.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myNumber").readOnly = true; } </script> </body> </html>
