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<html><body><h1>HTML DOM Events</h1><h2>The onkeydown Event</h2><p>Press and hold down a key inside the text field to set a red background color. Release the key to set a green background color.</p><input type="text" id="demo" onkeydown="keydownFunction()" onkeyup="keyupFunction()"><script>function keydownFunction() { document.getElementById("demo").style.backgroundColor = "red";}function keyupFunction() { document.getElementById("demo").style.backgroundColor = "green";}</script></body></html>