Cannot render graph

I have just found this library, but I cannot get to render a simple graph from the readme example. I am not using any web framework. Here is my code:
`







var graph = Viva.Graph.graph();
graph.addLink(1, 2);
var graphics = Viva.Graph.View.svgGraphics();
var renderer = Viva.Graph.View.renderer(graph, {
graphics : graphics
});
renderer.run();


`

Start by reproducing the README example using the provided HTML and dist/vivagraph.min.js; inspect Viva.Graph.graph(), svgGraphics(), and renderer.run(). Done means the simple graph renders in a non-framework page.

Written by the indexing model from the issue text.