Chrome 21 official version has received two consecutive updates. Windows, Mac, Linux, and Chrome Frame browser frameworks have been updated to 21.0.1180.79. On the basis of the previous minor update, this version mainly fixes a security issue about Adobe Flash.
Official download page: https://www.google.com/intl/en/chrome/browser/index.html
Chrome 21 contains many new features, such as the brand new HD video/audio communication API. You can directly authorize Web applications in your browser to access the camera and microphone without any plug-ins. It is also the first step to implement the WebRTC real-time communication standard to obtain high-quality video and audio communication through the Web.
Chrome 21 official edition also deeply integrates Google Cloud Print Cloud printing, expands support for game controllers, and supports Mac HD retina screens.