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    MouseEvent.altKey

    The MouseEvent.altKey read-only property is a Boolean indicates if the alt key was pressed (true) or not (false) when the event occured.

    Syntax

    var altKeyPressed = instanceOfMouseEvent.altKey
    

    Examples

    <html>
    <head>
    <title>altKey example</title>
    
    <script type="text/javascript">
    
    function showChar(e){
      alert(
        "Key Pressed: " + String.fromCharCode(e.charCode) + "\n"
        + "charCode: " + e.charCode + "\n"
        + "ALT key pressed: " + e.altKey + "\n"
      );
    }
    
    </script>
    </head>
    
    <body onkeypress="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 Status Comment
    Document Object Model (DOM) Level 3 Events Specification
    The definition of 'MouseEvent.altkey' in that specification.
    Working Draft No change from Document Object Model (DOM) Level 2 Events Specification.
    Document Object Model (DOM) Level 2 Events Specification
    The definition of 'MouseEvent.altkey' in that specification.
    Recommendation Initial definition.

    Browser compatibility

    Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
    Feature Firefox Mobile (Gecko) Android IE Mobile Opera Mobile Safari Mobile
    Basic support ? ? ? ? ?

    See also

    Document Tags and Contributors

    Contributors to this page: amycb, teoli, Jeremie
    Last updated by: teoli,