mediaPlaybackRequiresUserAction deprecated and iOS 9

WKWebViewConfiguration:

• mediaPlaybackRequiresUserAction has been deprecated since iOS 9

  In WKWebViewConfiguration:

  @available(iOS, introduced: 8.0, deprecated: 9.0)
  open var mediaPlaybackRequiresUserAction: Bool
  

  And specified by Apple

  mediaPlaybackRequiresUserAction

  Deprecated property. Instead, use mediaTypesRequiringUserActionForPlayback

WKWebViewConfiguration:

• According to Apple's documentation mediaTypesRequiringUserActionForPlayback is only for iOS 10+.

  In WKWebViewConfiguration:

  @available(iOS 10.0, *)
  open var mediaTypesRequiringUserActionForPlayback: WKAudiovisualMediaTypes
  

So here is my question:

as mediaPlaybackRequiresUserAction is deprecated for iOS 9, and mediaTypesRequiringUserActionForPlayback is only for iOS 10+, what can I use for iOS 9?