[Seaside] new Canvas rendering

[Jason Rogers]

Avi,

In a few recent posts you have made allusions to the new rendering
style using Canvas.  Can you summarize for us what that is (what it
does, how it differs, etc.)?

-- 
Jason Rogers

"I am crucified with Christ: nevertheless I live; yet not I,
but Christ liveth in me: and the life which I now live in 
the flesh I live by the faith of the Son of God, who loved 
me, and gave himself for me."
    Galatians 2:20