Advanced documentation

Opera is famous for its speed, security, flexibility, and standards support. These documents give you a look behind the user interface, and provide advice for changing files and using advanced settings.

Specifications

Opera prides itself in supporting all major web standards currently in use, including CSS 2.1, XHTML 1.1, HTML 4.01, HTML5, WML 2.0, ECMAScript, DOM 2 and SVG 1.1 tiny.

Changing files and settings

Opera version history

Captures the history of Opera versions, technology, and major release features.

Changelogs

The changelogs detail the changes made from previous releases.

Administrator’s how-to

Plug-ins and file formats

Opera APIs

Support

Opera Help

Need help? Hit F1 anytime while using Opera to access our online help files, or go here.