Presto (browser engine)

A succession of ECMAScript engines have been used with Opera. (For the origin of their names, see Cultural notes below.) Pre-Presto versions of Opera used the Linear A engine. Opera versions based on the Core fork of Presto, Opera 7.0 through 9.27, used the Linear B engine. The Futhark engine is used in some versions on the Core 2 fork of Presto, namely Opera 9.5 to Opera 10.10. When released it was the fastest engine around, but in 2008 a new generation of ECMAScript engines from Google (V8), Mozilla (SpiderMonkey), and Apple (JavaScriptCore) took one more step, introducing native code generation. This opened up for potential heavy computations on the client side and Futhark, though still fast and efficient, was unable to keep up. In early 2009, Opera introduced the Carakan engine. It featured register-based bytecode, native code generation, automatic object classification, and overall performance improvements. ==History and development==

Web browsers • Opera • Opera 7 to 12 • Opera Mobile 9.5 to 12 • Opera Mini (continues to use Presto rendering on an intermediate server on keypad phones and as Extreme mode on Android devices) • Nintendo • Nintendo DS Browser (based on Opera) • Nintendo DSi Browser (based on Opera) • Wii Internet Channel Browser (based on Opera) • Nokia 770 Browser (based on Opera) • Sony Mylo COM-1's Browser (based on Opera) HTML editors • Macromedia Dreamweaver MX to Dreamweaver CS3 (CS4/CS5 use WebKit) • Adobe Creative Suite 2 and 3 == Source code leak ==

The source code for version 12.15 was leaked to GitHub on February 11, 2016. It remained unnoticed until January 12, 2017 and was taken down two days later in response to a DMCA request. Opera Software has confirmed the authenticity of the source code. ==Cultural notes==

The ECMAScript engines used with Opera have been named after ancient and traditional writing scripts, including undeciphered Linear A, Ancient Greek Linear B, Runic Futhark, and Javanese Carakan. ==See also==