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docs: explain the null webContents case in permission checks (#30645)

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* docs: explain the null webContents case in permission checks

* Update docs/api/session.md

Co-authored-by: Erick Zhao <erick@hotmail.ca>

Co-authored-by: Erick Zhao <erick@hotmail.ca>
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Samuel Attard 2021-08-24 17:41:56 -07:00 committed by GitHub
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@ -524,7 +524,7 @@ session.fromPartition('some-partition').setPermissionRequestHandler((webContents
#### `ses.setPermissionCheckHandler(handler)`
* `handler` Function\<Boolean> | null
* `webContents` ([WebContents](web-contents.md) | null) - WebContents checking the permission. Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin. Cross origin sub frames making permission checks will pass a `null` webContents to this handler. You should use `embeddingOrigin` and `requestingOrigin` to determine what origin the owning frame and the requesting frame are on respectively.
* `webContents` ([WebContents](web-contents.md) | null) - WebContents checking the permission. Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin. All cross origin sub frames making permission checks will pass a `null` webContents to this handler, while certain other permission checks such as `notifications` checks will always pass `null`. You should use `embeddingOrigin` and `requestingOrigin` to determine what origin the owning frame and the requesting frame are on respectively.
* `permission` String - Type of permission check. Valid values are `midiSysex`, `notifications`, `geolocation`, `media`,`mediaKeySystem`,`midi`, `pointerLock`, `fullscreen`, `openExternal`, or `serial`.
* `requestingOrigin` String - The origin URL of the permission check
* `details` Object - Some properties are only available on certain permission types.