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<html><body><h1>HTML DOM Events</h1><h2>The onkeydown Event</h2><p>Use the addEventListener() method to attach a "keydown" event to an input element.</p><p>Press a key inside the text field to set a red background color.</p><input type="text" id="demo"><script>document.getElementById("demo").addEventListener("keydown", myFunction);function myFunction() { document.getElementById("demo").style.backgroundColor = "red";}</script></body></html>