See Epic's Unreal Engine 3 running in HTML5

The demo is designed to work within any standards-based browser implementing HTML5, WebGL and Javascript, such as Firefox.

Unreal Engine 3-powered, HTML5-ready demo game Epic Citadel is now open to the public from Epic Games' website.

The demo is designed to work within any standards-based browser implementing HTML5, WebGL and Javascript, such as Firefox. It does not require further plugins or components. Epic Games designed the demo to show off the capabilities of the Unreal Engine using web-standard technologies.

"With Mozilla's latest innovations in JavaScript, game developers and publishers can now take advantage of fast performance that rivals native while leveraging scale of the Web, without the additional costs associated with third-party plugins," says Mozilla. "This allows [developers] to distribute visually stunning and performance intensive games to billions of people more easily and cost effectively than before."

The collaboration between Mozilla and Epic succeeded in porting Unreal Engine 3 to Web in four days, using C++-accessible tool Emscripten and the Mozilla-backed JavaScript subset asm.js. The Epic Citadel demo also ships with Epic's free Unreal Development Kit.

In addition to the HTML5 version, Epic Citadel is also available for iOS and Android. You can learn more at the studio's website.