Re: [w3c/uievents] The order in which the `contextmenu` `auxclick` event is triggered (#285)

On Windows and macOS, a native event notifies applications of context menu open. It seems that GTK on Linux does not have it.
* https://docs.microsoft.com/windows/win32/menurc/wm-contextmenu
* https://developer.apple.com/documentation/appkit/nsview/1483231-menuforevent

And whether context menu should be opened at `mousedown` or `mouseup` depends on the platform manner. So, it might be difficult to consider the order.
https://searchfox.org/mozilla-central/rev/31ddf859c57e812878a5f817e4097efb06de4d97/modules/libpref/init/StaticPrefList.yaml#9965-9971

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