If you need dynamic capability (e.g. reading data from csv file or database) then

you have to export it in programming language like java.

You would also need to export in java - if your page has lots of flash

components. e.g.

http://www.adobe.com/devnet/flash/articles/flash_selenium_04.html

There is also attempt to make silverlight work with java and .net out here.

The client code using java also is more stable (less permission denied errors) then

the html case.

But the html is easy to modify/maintain and it generates nice results - whereas in

java client code it tends to be cryptic(but again html test case - does not seem to be flexible).