adding type attribute to Canvas HTML DOM interface

Hello My friends,


I was doing some process on Canvas interface,I came across some problem
which can be solved by

adding an attribute such as "type" to canvas which can contain these values
: game ,User interface,simple image,animation, dynamic image ,,,....

I mean different usage of canvas,by this attribute different process can be
possible to be done on Canvas UI.


What is your opinion?


Thanks
-- 
Paniz Alipour