How do they do that? Transparent foreground on a web page

Posted by Jim Beam on Stack Overflow See other posts from Stack Overflow or by Jim Beam
Published on 2010-05-14T22:10:07Z Indexed on 2010/06/06 13:52 UTC
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You know how sometimes you are on a good site and you click a button (like to submit a form) and the form doesn't go away, instead, the foreground becomes transparent and it contains a message of some kind, or another page. The message is at the forefront but the previous page is still mostly visible behind it - how do they do that? I'm assuming it's an Ajax-esque trick.

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