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<item value="A route that blocks interaction with previous routes. [ModalRoute]s cover the entire [Navigator]. They are not necessarily [opaque], however; for example, a pop-up menu uses a [ModalRoute] but only shows the menu in a small box overlapping the previous route. The `T` type argument is the return value of the route. If there is no return value, consider using `void` as the return value." />
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