All of these simulation and learning platforms are browser based.
The Following browsers support HTML5 and CSS code (if in doubt about your browser, use this link to test it: http://html5test.com/):
Internet Explorer 9.0 and later (if possible, use 10.0 and AVOID anything prior to 9.0)
Chrome 10.0 and later
Firefox 4.0 and later
Opera 12.0 and later
Safari 6.0 and later
OUR RECOMMENDATION IS TO USE THE LATEST CHROME BROWSER.