DefaultWindowPlacementSetting

Setting the policy to BlockWindowPlacement (value 2) automatically denies the window placement permission to sites by default. This will limit the ability of sites to see information about the device's screens and use that information to open and place windows or request fullscreen on specific screens. Setting the policy to AskWindowPlacement (value 3) will prompt the user when the window placement permission is requested by default. If users allow the permission, it will extend the ability of sites to see information about the device's screens and use that information to open and place windows or request fullscreen on specific screens. Leaving the policy unset means the AskWindowPlacement policy applies, but users can change this setting.