In the link, http://jquerymobile.com/demos/1.0/docs/toolbars/docs-headers.html and in section "Adding Back buttons", it says
This can also be set via markup if the page div has a data-add-back-btn="true" attribute.
But in the link, http://jquerymobile.com/demos/1.0/docs/api/data-attributes.html , the attribute data-add-back-btn is shown under Header, which is totally misleading. One would easily assume that the attribute is part of the header container, whereas in reality it works only when added to the page container.
Also, the other 2 related attributes data-back-btn-text and data-back-btn-theme should be listed under page container and not header
That's weird... I noticed the same thing about 5 minutes before I saw this ticket.