Re: [w3c/gamepad] Add a Model section (#136)

@marcoscaceres commented on this pull request.



> +        as user gestures. A transition MUST NOT be included if the transition
+        could occur without user interaction.
+      </p>
+      <p>
+        The user agent MUST NOT expose information about connected gamepads
+        until a gamepad user gesture has been received from any connected
+        gamepad. The user gesture MUST be tracked independently for each gamepad
+        context. A <dfn data-lt="gamepad context">gamepad context</dfn> MUST be
+        created when a page first requests the current gamepad state or
+        registers for gamepad connection events. The gamepad context MUST be
+        destroyed when the tab is closed or navigates away from the current
+        page. Reloading the current page MUST NOT destroy the gamepad context.
+      </p>
+      <p>
+        To register a user gesture, a gamepad context MUST be active. A gamepad
+        context is active if the page associated with the context is visible and

```suggestion
        context is <dfn>active</dfn> if the page associated with the context is visible and
```

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