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altKey combinations not working


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Hi,

Trying to detect altKey combinations in a text area, but it's not working. In the following example, the code detects ctrl-a, but not alt-a. Why?

<!DOCTYPE html>
<html>
<head>
<script>
    function myFunction(e) {

        if(e.altKey && e.key=="a") // option-a is not detected
            console.log("alt-a");
        else if(e.ctrlKey && e.key=="a") 
            console.log("ctrl-a"); // ctrl-a is not detected
        
    }
</script>
</head>
<body>
<p>Press ctrl-a inside the text area. Then, press option-a (alt-a) inside the text area.</p>
<textarea id="demo" onkeydown="myFunction(event);"></textarea>
</body>
</html>

 

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