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altReturns true if the alt key was down when the mouse event was fired.
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buttonThe button number that was pressed (if applicable) when the mouse event was fired.
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buttonsThe buttons being depressed (if any) when the mouse event was fired.
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clientXThe X coordinate of the mouse pointer in local (DOM content) coordinates.
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clientYThe Y coordinate of the mouse pointer in local (DOM content) coordinates.
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ctrlReturns true if the control key was down when the mouse event was fired.
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detailReturns a long with details about the event, depending on the event type.
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metaReturns true if the meta key was down when the mouse event was fired.
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offsetXThe X coordinate of the mouse pointer between that event and the padding edge of the target node
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offsetYThe Y coordinate of the mouse pointer between that event and the padding edge of the target node
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pageXThe X coordinate of the mouse pointer relative to the whole document.
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pageYThe Y coordinate of the mouse pointer relative to the whole document.
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relatedThe secondary target for the event, if there is one.
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screenXThe X coordinate of the mouse pointer in global (screen) coordinates.
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screenYThe Y coordinate of the mouse pointer in global (screen) coordinates.
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shiftReturns true if the shift key was down when the mouse event was fired.
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xAlias for NativeMouseEvent.clientX
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yAlias for NativeMouseEvent.clientY
https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent