You can record tests in Selenium or something like Capybara and replay them using something like PhantomJS, which is a headless browser-like JS execution enviro

You can record tests in Selenium or something like Capybara and replay them using something like PhantomJS, which is a headless browser-like JS execution environment that does things like generate a would-be DOM: https://github.com/jnicklas/capybara https://github.com/jnicklas/capybara You can also use Selenium tests with things like https://www.browserstack.com/automate https://www.browserstack.com/automate , where TL;DR they run your selenium test on dozens of browser + platform combinations and send you the results, like screenshots and any javascript errors. If you're familiar with CI stuff, you can see how powerful this has the potential to be. It's non-trivial but very possible to run your own cluster of selenium nodes as well; check out the official Selenium Grid: http://www.seleniumhq.org/projects/grid/ http://www.seleniumhq.org/projects/grid/