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<html><body>Name: <input type="text" id="myText"><p>Click the button to set the maximum number of characters allowed in the text field.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { document.getElementById("myText").maxLength = "4"; document.getElementById("demo").innerHTML = "Maximum number of characters allowed in the text field is now 4.";}</script></body></html>