Let's say we have a Risk-like world map which is divided into regions of custom shape. How does one enable the user to select an individual region using HTML5/JavaScript? I assume Canvas2D is the first step, but then what? <img src="https://i.stack.imgur.com/mhQO8.png" alt="DominateGame">

There are gazillions of great libraries. To name a few: <ul> <li>http://d3js.org/</li> <li>http://raphaeljs.com/</li> <li>http://paperjs.org/</li> <li>http://box2d-js.sourceforge.net/</li> <li>http://threejs.org/</li> </ul> Specific examples: <ul> <li>http://bl.ocks.org/mbostock/2206590</li> <li>http://raphaeljs.com/world/</li> <li>http://raphaeljs.com/australia.html</li> </ul>