Required understanding of animate-elem-219-t test case

Hi,

Can somebody please help me understand animate-elem-219-t test case in SVG
Tiny 1.2 Test Suite.

http://www.w3.org/Graphics/SVG/Test/20080912/htmlObjectHarness/animate-elem-219-t.html

I am not able to understand why the bottom right triangle disappears after 2
sec. Is there anything mentioned in spec regarding this.

Waiting for your reply.

Thanks and Regards,
Pavan