In this particular case, the answer could be performance. Google's ExplorerCanvas (emulation by VML) is much slower than native canvas implementations (particu

In this particular case, the answer could be performance. Google's ExplorerCanvas (emulation by VML) is much slower than native canvas implementations (particularly compared to new JS engines like in FF3.1 Beta 2 or Webkit nightly). For standard 2D graphics it's good enough, but if you push browser to the limits, like with a software 3D renderer, ExplorerCanvas would probably be unbearably slow. This demo looks like a Demoscene release [1], so they probably wouldn't like to be caught with a slow code :). [1] http://en.wikipedia.org/wiki/Demoscene http://en.wikipedia.org/wiki/Demoscene