Presto (layout engine)

Presto is a layout engine for the Opera web browser developed by Opera Software. After several public betas and technical previews, it was released on January 28, 2003 in Opera 7.0 for Windows; it is the browser's current layout engine. Presto replaced the Elektra engine used in versions 4–6 of Opera. Unlike Elektra, it is dynamic: the page or parts of it can be re-rendered in response to DOM and script events. Presto is only available as a part of Opera browser or related products. The source or binary (DLL) forms of the engine are not publicly available. Subsequent releases have seen a number of bugs fixed and optimisations to improve the speed of the ECMAScript ("JavaScript") engine.

JavaScript engines

Two JavaScript engines are used in combination with Presto. The "linear_b" engine is used in Opera 7.0 through 9.25.^[1] The "futhark" engine is used in Opera 9.5 and will be used in Opera 10.^[2]

Presto-based applications

Web browsers

• Opera 7 and above
• Nintendo DS Browser (based on Opera)
• Nokia 770 Browser (based on Opera)
• Sony Mylo's Browser (based on Opera)
• Wii Internet Channel Browser (based on Opera)

HTML editors

• Macromedia Dreamweaver MX and above
• Adobe Creative Suite 2

See also

• List of layout engines
• Comparison of layout engines

References

•  • e Opera
Companies	Opera Software · Telenor
Software	Opera (History · Features · Opera Mail) · Opera Mobile · Opera Mini · Nintendo DS Browser · Internet Channel · Presto
Web sites	My Opera Community
Notable individuals	Håkon Wium Lie · Jon S. von Tetzchner · Geir Ivarsøy