Table with rounded corners

This is an example of a table with rounded corners. It is made as an example for the question in this thread on Gathering of Tweakers.

Every table cell needs an extra containing span for the rounded corner effect to work. View the source to see how it's done.

This demo unfortunately only works in Gecko browsers like Firefox.

header
row 1 cel cel
row 2 cel cel
row 3 cel cel