This is demonstration of rendering arbitrary triangles (relatively fast) with javascript/DOM/css (no images, flash, canvas tags or java applets). This page is fugly in IE6 because it does not render transparent borders properly, but it does work in the latest versions of IE7, Firefox and Opera. This was hacked together in 2 evenings, so there are some glitches and the code is not great; it’s just a proof of concept.