It was removed from the HTML spec in 2017 because of the lack of implementer 
interest ( There is no other browser 
that implements this feature.

Items to be removed:

* `<menuitem>`
* The `type` attribute of `<menu>`
* The `onshow` event handler
* The `contextMenu` attribute of HTMLElement

It will first be hidden behind the flag `dom.menuitem.enabled` and later will 
be completely removed.

Bug to remove: and
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