Ah ok cool! So what path to this being used in applications do you have in mind? Are you hoping to implement a decent part of the spec in the coming years? Do you have a rough timeline?
Rasterizer excels at animation and complex scenes, e.g. 2D CAD documents. The original inspiration was Flash, as I love innovative design tools. Flash 1.0 could easily be used by designers, but ultimately lost its way became a coder's toy after the Adobe acquisition and ActionScript 2.0.
Fleshing out the spec is planned, but I cannot provide a timeline as this has all been done at my own considerable expense. Maybe if my tips grow: https://paypal.me/mindbrix
The first priority was to solve paths to pixels efficiently, including text (50,000 glyphs @ 60fps).
Gradients will be added when time allows, as I have code from a previous engine.
The coverage algorithm can be extended to support cheap box blurs, which could be used for drop shadows.