Readonly altTrue if the alt key was down when the mouse event was fired.
Readonly ctrlTrue if the control key was down when the mouse event was fired.
Readonly currentA reference to the currently registered target for the event. This is the object to which the event is currently slated to be sent. It's possible this has been changed along the way through retargeting.
Readonly metaTrue if the meta key was down when the mouse event was fired.
Readonly shiftTrue if the shift key was down when the mouse event was fired.
Readonly targetA reference to the target to which the event was originally dispatched.
Readonly timeThe time at which the event was created (in milliseconds). By specification, this value is time since epoch—but in reality, browsers' definitions vary. In addition, work is underway to change this to be a DOMHighResTimeStamp instead.
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Data of user interactions that have key modifires. Documentation from the Mozilla Web API website.