GenCon provides a simple text-based display with a curses-like interface. GenCon does not use HTML5's canvas, as most libraries like this do. I figure, if it's text, why not implement it using text? This may be used for roguelikes, or geeky niche applications of any sort.
Every function is documented fairly thoroughly in the code in gencon.js
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An example that tests out most available functionality is located in examples/test.html