JavaScript Polyfills

I believe improving JS polyfills is an important project becasue it can offer a major part of the use base features they need and, maybe, influence the standardization in the actual SVG working draft. I have already started documenting the polyfills, as shown in the proposal task list. If we get a way of polyfilling Inkscape-specific functionality, I think it's the start for different mesh-gradients development, animations and other 'imported' functionality from other graphics software. Both are mentored by Tavmjong Bah.