title: How to Mute WebView control (disable sounds)?
body: <p>I try to find how to mute WebView control in my UWP application.</p>
  
  <p>The App contains WebView control to show advertisements. When user disables app sounds it is not good to play any sounds.  But some ads have sound and users are unhappy.</p>
  
  <p>I've tried set ElementSoundPlayer.State as ElementSoundPlayerState.Off but it does not help.</p>
  
  <p>Thank you in advance.</p>