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<!DOCTYPE html> <html> <body> Birthday: <input type="date" id="myDate"> <p>Click the button to set the date field to read-only.</p> <p><strong>Tip:</strong> To see the effect, try to type something in the date field before and after clicking the button.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="date" do not show as any date field/calendar in Firefox.</p> <script> function myFunction() { document.getElementById("myDate").readOnly = true; } </script> </body> </html>