This enumerated type is for representing keyboard modifiers. These are keys
that are held down in addition to other event types.
        
        
Members
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    staticconstantKeyboardEventModifier.ALT :Number
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    Represents the alt key being held down.
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    staticconstantKeyboardEventModifier.CTRL :Number
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    Represents the control key being held down.
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    staticconstantKeyboardEventModifier.SHIFT :Number
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    Represents the shift key being held down.
