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.
KeyboardEvent.altKey
Value
A boolean value
Examples
<html> <head> <title>altKey example</title> <script type="text/javascript"> 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>
Specifications
| Specification |
|---|
| UI Events # dom-keyboardevent-altkey |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
altKey |
1
|
12
|
1.5
|
9
|
≤12.1
|
1.2
|
≤37
|
18
|
4
|
≤12.1
|
1
|
1.0
|
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/altKey
