Products Web Updates Contra in HTML5 + Web Audio API By Eric Bidelman Engineer @ Google working on Lighthouse, Web Components, Chrome, and the web Thanks to the power of GWT, HTML5, and the Web Audio API we can build the originator of everyone's favorite cheat code, Contra: http://nes-sound.brad-rydzewski.appspot.com/ Check out the open source NES Emulator in HTML5, gwt-nes-port. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated February 28, 2017.