WebGL OnApplicationQuit() does not called

Hi all, I'm working on a multiplatform project (with also WebGL) that can save some value into the Player prefs during the Game Session. I need to clear these Prefs on Game Close(in this case, Tab Close or Browser quit). On desktop, i Use OnApplicationQuit to clear the prefs and works fine, but on WebGL it does not Called. there is a way to do this ? maybe usign a jslib that can trace the tab close ? or throug a Javascript function into the Html that clear the IndexDB of this Game ?

I've see that there is an Issue tracker Won't Fix for this at

https://issuetracker.unity3d.com/is...ity-web-player-when-closing-or-refreshing-tab

I'm on Unity 5.6.2f1 (can not upgrade because i'm near to the release.)

Hope that someone can drive me into the right way.

Thanks in advance for the support and suggestions.

 

You can use

onbeforeunload https://www.w3schools.com/jsref/event_onbeforeunload.asp

or

onunload https://www.w3schools.com/jsref/event_onunload.asp

 

@blacKodeI'm having the same issue and do you have any suggestions to do this? That would be really helpful