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<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><script>function myFunction() { document.getElementById("myDate").readOnly = true;}</script></body></html>