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Tab-Modality and You

Years ago, I remember watching a webcast of the introduction of the Aqua user interface when Mac OS X Public Beta was first demoed. The part I distinctly remember was realizing the brilliance of sheets. Like many great innovations, they were simple in retrospect and solved a problem you didn't realize you had: the modality problem — the fact that dialog boxes blocked interacting with the whole application even though only one window needed the information that you, as the user, had to provide. I watched in wonder as a save dialog blocked only the one window that needed saving, leaving all the other windows free. Finally, a solution to limit the modality.

Because modality sucks.

Back in 2000, sheets worked well because the smallest unit of user interaction with an application was a window. Soon after, though, things started to change. Web browsers in particular were among the first to start using tabs to put more than one document in a window.
This caused a snag. A web page can require modal interaction from the user: picking a file, or supplying a username and password. Yet we don't want to prevent the user from switching to a different tab and continuing to interact with other websites. If the finest-grained modality control we have is per-window, how can we achieve that outcome?
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