Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Press the "A" key on the keyboard in the input field to alert some text.</p>

<input type="text" size="40" onkeydown="myFunction(event)">

<p><strong>Note:</strong> The key property is currently only supported in Firefox and IE9+.</p>

<script>
function myFunction(event) {
    var x = event.key;

    // If the pressed keyboard button is "a" or "A" (using caps lock or shift), alert some text.
       
    if (x == "a" || x == "A") { 
        alert ("You pressed the 'A' key!");
    }
}
</script>

</body>
</html>