how do i keep a galaxy game tab running in the background

how do i keep a galaxy tab running in a background? i know you can do it with games with sound but what about games without sound?

There is an experimental feature in the sidebar's options that sends a "fake" music track to prevent browser pausing. From my experience it doesn't work very well, though. My preferred alternative is to pull the game out to its own window and just leave a bit of the browser window visually visible on screen; it only needs to be like, a thin column or something.