The latest Chromium build has got a very innovative feature: initial support for JavaScript (ECMAScript) Harmony. Although, this feature is experimental and users need to enable it manually from chrome://flags page.

ECMAScript Harmony

In short, ECMAScript Harmony project is the future of JavaScript. It is an ongoing project to standardized the JavaScript, in the same way as the HTML5 has redefined HTML. To know more about the Harmony project, you should refer the following articles:

• ECMAScript Harmony by John Resig (August 2008)
• New Life for JavaScript on SitePoint.com (August 2008)

JavaScript Harmony enables web pages to use experimental JavaScript features. To download latest Chromium build, visit this page (Windows).