>>Just out of curiousity, what's an example of when you would want to do something like this? Where an operation would be performed based on a select value of the combo box, before the user okayed the value. Especially on a web page. It would drive me batty if the browser updated if I clicked my mouse wrong.
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>I see it on tons of pages, like, where you pick a region or language to view the site from or in.
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>Why do they do that? The same reason they do use all the other horrible Web UIs, cause they can and they don't know better.

I don't know. I know that classically, combo isn't supposed to perform anything on its own, but I think that there is a good argument to be made for a combo acting as a navigational device on a web page. It saves an inevitable click...

I have to admit though, that it is annoying when I select one, forget to move the focus from it, and then use my mouse wheel to try and scroll the page down. Instead, it scrolls the combo, and goes to a new page.