# KeyboardEvent altKey Property

Event Object

## Example

Find out whether or not the "ALT" key was pressed when a keyboard key is pressed:

var x = document.getElementById("demo");
if (event.altKey) {
x.innerHTML = "The ALT key was pressed!";
} else {
x.innerHTML = "The ALT key was NOT pressed!";
}
Try it yourself »

## Definition and Usage

The altKey property returns a Boolean value that indicates whether or not the "ALT" key was pressed when a key event was triggered.

Note: On some Mac keyboards, the "ALT" key is displayed as "Option" or "Opt".

Note: This property is read-only.

## Browser Support

Property |  |  |  |  |
--- | --- | --- | --- | --- | ---
altKey | Yes | Yes | Yes | Yes | Yes

## Syntax

event.altKey

## Technical Details

Return Value:

A Boolean, indicating whether the "ALT" key was pressed when the key event occured.

Possible values:

- true - The alt key was pressed
- false - The alt key was not pressed

DOM Version: | DOM Level 2 Events

## Related Pages

HTML DOM reference: KeyboardEvent ctrlKey Property

HTML DOM reference: KeyboardEvent metaKey Property

HTML DOM reference: KeyboardEvent shiftKey Property

Event Object

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