IE also supports rounded borders, with some limitations. I don't know exactly which versions — check it up by yourself.
To make sure this is true, it's enough to see this rounded corner generator with different browsers. It will also generate appropriate cross-platform CSS for you. Please see:
http://cssround.com/[
^].
The idea is to define the properties in the way required by different layout engines, all at once. Each engine will ignore the syntax variant it does not implement and use its own. Try it — it works.
You can find a lot of articles explaining the background:
http://bit.ly/HPm624[
^].
—SA
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