Baseline Widely available
The KeyboardEvent.altKey read-only property is a boolean value that indicates if the alt key (Option or ⥠on macOS) was pressed (true) or not (false) when the event occurred.
A boolean value.
Examples<!doctype html>
<html lang="en-US">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>altKey example</title>
<script>
function showChar(e) {
alert(
"Key KeyDown: " +
String.fromCharCode(e.charCode) +
"\n" +
"charCode: " +
e.charCode +
"\n" +
"ALT key KeyDown: " +
e.altKey +
"\n",
);
}
</script>
</head>
<body onkeydown="showChar(event);">
<p>
Press any character key, with or without holding down the ALT key.<br />
You can also use the SHIFT key together with the ALT key.
</p>
</body>
</html>
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