Comment 9 for bug 1331475

Bill... The only case where we need a way out is gaming, because games use taps for their own purposes. For viewing media, you can tap the media and bring onscreen controls (this is being accomplished using the media services designs / spec) and always exit gracefully (like youtube, iOS native media play, etc.)

So for web games only, we recommend the solution we proposed because A) discovery of that particular behavior in the bottom edge will be unlikely B) this is only for casual gaming on the web... actual full screen games will have their own controls. I can't think of another use case, can you? C) the bottom edge is already occupied with tabs... we don't want that behavior to change.