This page runs a series of a examples using classes in ECMAScript 6 without any transpilation. This means your browser must support ES6 class syntax in order to successfully run the code. Open up your debugging console to view the output.
Browser support: All JavaScript engines except for Firefox
For more information on how classes work and their level of support, check out the Classes article that is part of the Learning ES6 series.
Source code | Babel example | Traceur example | Index of examples