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The newest possible javascript version you can set in NetBeans currently is: Firefox 3.x or later IE7 or later Safari 3 or later Opera (just Opera, no version) JS version: 1.8 ______ This means you cannot code for modern browsers ( IE9+, Chrome, Safari 5 ) or legacy semi-modern borowsers ( IE8, FF3.6, Safari 4 ) without getting yellow triangles, same with coding for Node.js ( V8 ). Current version of EcmaScript is 5.1. It is supported by all 5 major browsers ( ie9+, ff4+, chromeX, opera12 ).