Opera has released Opera 10.0 Alpha based on Presto 2.2 rendering engine which provides significant improvements in speed, performance and security.

Key new features of Opera 10.0 Alpha include:

- Presto 2.2 Engine: Presto 2.2 features numerous new features and bug fixes such as Web font support, Improved CSS performance, etc.

- Performance boost: It offers upto 30% increased speed and performance on resource intensive pages such as GMail or Facebook.

- 100/100 and pixel-perfect on the Acid3 test

- Auto-update: Opera can automatically update itself as new versions are released

- Inline spelling checker: Opera can now check your spelling as you write. The inline spelling checker is enabled by default for multi-line edit fields and this Alpha comes with a US English dictionary.

- Opera Mail improvements, including rich text composition and delete after X days

- Widget Improvements on Linux: Experimental support for true transparency for widgets on Linux/UNIX

Download Opera 10.0 Alpha 1 for Windows | Mac | Unix