AJAX Design Pattern: Read/Write Div

A new AJAX convention cropping up in a few places, one that is easy to implement and has real benefit to end users. I haven’t found a description of it anywhere, so I thought I’d write it up here.
The basic idea is that user controls (typically for editing the displayed data) should be hidden from the user until needed. At “rest”, an area of the screen displays information in read-only fashion.
On clicking an “edit” button, the div expands to display the widgets for changing the data.

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