I am using jquery, typekit and processing.js. quite lot of things together.
What i found is that although lots of browsers support canvas, only the new firefox and chrom display my sketch. Problem is browsers like safari and IE9 think that can display it but they dont so canvas fallback (what you put between <canvas></canvas>) doesnt work.
Partialy i believe its because i use 3D in my sketch which means i need to use WebGl. Maybe its only because of that ( ill have to try how 2d proccesing wokrs on differend browsers).