* move iframe after close-button to follow tab-order
* add missing prevActiveElement
* prepare focus-handling for error_message
* iframe.src through prop instead of directly accessing it
* do not change close button HTML-element for compatability
* make all overlay elements role=dialog and modals
* fix close button
* fix re-opening of iframe
* make error-message read out when shown
* Improve handling of frame_src with frame_loading
* manually focus continue or close button in alert-box
* fix btn-focus in transition
* Improve quantity group