Dragging Panel Reveals Gray Background on iOS

Dragging Panel Reveals Gray Background on iOS

If you open the jQuery Mobile demo page on iOS and then go to the bottom of the page and press and drag the panel, the entire panel moves up revealing a gray background. If you let go it then springs back. This of course happens in jquery mobile apps too and frustrates users.

Is there a way to prevent this from happening?

Note this does not do this in Android devices.