Proof of concept. Right now just lines--click and drag to draw one. Press space to open the output, then triple click the first item and copy it (ctrl-c or cmd-c). Then paste it into a browser, right click the background and select "save as." There you have it; a full vector image!
Planned features: -tool selection -css styling rules -possible base 64 encoding for a smaller output -movement of already-created lines (and other objects)