IE11 problem: Sound ON after closing the game

I have an issue,

On platform I'm working on, the games being opened in iFrame, and sometimes when closing the iFrame with the game, the sound (looping background-music) continue to play... But the game is no more existing!!!

It happening only in Internet Explorer...

Is there an option from the game to be triggered when closing the game to force-mute/stop the sound?

Thank you.

Please, any help?

It's not really closing the game.

Load a blank html file instead.

Wow,

It's not really closing the game.

what do you mean that the game is not really closed?

Is it still runing in the background?

Can the game detect that state?

Thank you!

I don't know what code you are using, but there is no attribute for closing one.

You can load some other content, or do it via javascript.