OptionalaltKey?: booleanOptionalbutton?: numberThe button which changed (0 is the main button) (default 0)
Optionalbuttons?: numberThe buttons which are down (default 0)
OptionalclientX?: numberOptionalclientY?: numberOptionalctrlKey?: booleanOptionalmetaKey?: booleanOptionalrelatedTarget?: PseudoEventTarget | nullThe other target involved (the one the mouse came from or went to) (default null)
OptionalscreenX?: numberOptionalscreenY?: numberOptionalshiftKey?: boolean
The options for creating a mouse event, on top of the ones every UI event has.