How Canvas benefited Bespin

Question

I wasn't sure what Canvas did or how it it's useful, so I googled and found this: http://www.thecssninja.com/javascript/5-uses-canvas-tag

number 1 says

"By far the best implementation of canvas so far is Mozillas Bespin a web code editor which uses canvas to create it’s slick interface, without canvas Bespin would not be as responsive as it is even with thousands of lines of code."

Can somebody explain how or why? As in, in what way did canvas benefit Bespin? I have an app that could be more responsive. :)

Thanks.

Answer 1

As far as i know Bespin uses canvas to gain complete control of the rendering. here is an interesting article that covers the topic. Article