How to stop sound playing in background (in a Webview or mobile browser)?

Works well in ios, both Safari mobile & webview !
Whan changing focus -> go to scene with a custom behavior that stop the ambient sound.

Not 100% working in Android, when changing focus, the sound stop, but when I return in the app, the app is relaunched from the begining…so it’s not the behaviour expected…

I post it also in the good topic.